Can a dog go into heat and not bleed?

How Long Is A Dog In Heat Bleed?

Best Answer

Yes, your dog may have simply given off little signs of going into heat you may have not caught.

Some dogs are fastidiously clean and will readily lick off any signs of evidence, so the bloody discharge may have never made it to the floor.

Other dogs simply don't bleed much at times, these "dry heats" are not abnormal.

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Can a dog be on heat and not bleed?

Yes, your dog may have simply given off little signs of going into heat you may have not caught. Other dogs simply don't bleed much at times, these "dry heats" are not abnormal. If you are planning to breed your dog, don't rely on the presence of blood alone!

Can a dog be in heat and not bleed?

Yes, your dog may have simply given off little signs of going into heat you may have not caught. Other dogs simply don't bleed much at times, these "dry heats" are not abnormal. If you are planning to breed your dog, don't rely on the presence of blood alone!

Can a female dog be in heat and not bleed?

You should be concerned if your female does not have a heat cycle until they are 24 to 30 months of age you will want your veterinarian to examine her. This occurs when your female will have a heat cycle without the normal symptoms such as bleeding and swelling of the vulva.

How To Understand Your Dog's Heat Cycle

Can a dog go into heat early?

​When Do Dogs Go Into Heat? Some dogs can go into heat as young as four months, while larger breeds may be as old as two years before their first heat. Responsible breeders never breed a dog on her first or even her second heat. It is considered best practice to wait until her third heat, at about 18-24 months.

Can a male dog go into heat?

Male dogs do not go into heat like females. They are sexually active year-round, but they are most fertile after 12-to-15 months of age, once they are fully physically mature.

Can dogs in heat not bleed?

Yes, your dog may have simply given off little signs of going into heat you may have not caught. Some dogs are fastidiously clean and will readily lick off any signs of evidence, so the bloody discharge may have never made it to the floor. Other dogs simply don't bleed much at times, these "dry heats" are not abnormal.

Can a dog bleed when not in heat?

A bloody discharge from the vulva is a normal part of a female dog's heat cycle. However, if your dog has been spayed or you know it is not time for your intact dog to go into heat, the bleeding could be a sign of a potentially serious health problem.

How often and when do dogs go into heat?

Although six months old is the average age of a dog's first heat, this can vary widely. Some dogs can go into heat as young as four months, while larger breeds may be as old as two years before their first heat. Responsible breeders never breed a dog on her first or even her second heat.

FEMALE DOG IN HEAT | TIPS 101 | What to do | Herky the Cavalier

Can male dogs go into heat?

Sexually mature female dogs typically go into heat twice a year. Male dogs do not go into heat like females. They are sexually active year-round, but they are most fertile after 12-to-15 months of age, once they are fully physically mature.

Can dogs go into false heat?

Relax, she may just be experiencing false pregnancy—a very common condition for intact or unspayed, female dogs that occurs after they go through an estrus or heat cycle. As a result, after any heat cycle, your dog can experience most of the same signs of pregnancy as when she's not actually pregnant: Early lethargy.

Does a male dog go into heat?

Male dogs do not go into heat like females. They are sexually active year-round, but they are most fertile after 12-to-15 months of age, once they are fully physically mature.

Does a spayed dog go into heat?

It is this estrogen that triggers your dog to go into heat. When your pet is spayed, the entire reproductive tract (including both ovaries and the uterus) is surgically removed. Therefore, your spayed dog no longer has ovaries, produces estrogen, or goes into heat.

How long does a dog bleed when they go into heat?

The estrus cycle has four stages. The first stage is called proestrus. This lasts approximately 10 days and it is during this stage that your dog will bleed from the vaginal area. This is your dog's preparation for pregnancy phase, but she will not want to mate with a male during this time.

Dogs In Heat - In Depth Explanation by Master Dog Trainer

Can a spayed dog still go into heat?

It is possible for a female dog or cat that has gone through spay surgery to show signs of heat—bleeding, attracting males, and behavioral changes—after the surgery. Most likely some ovarian tissue was left intact during surgery and that tissue releases hormones that can cause the animal to go into heat.

Can a dog go into heat after being fixed?

It is possible for a female dog or cat that has gone through spay surgery to show signs of heat—bleeding, attracting males, and behavioral changes—after the surgery. Most likely some ovarian tissue was left intact during surgery and that tissue releases hormones that can cause the animal to go into heat.

Can a dog go into heat after giving birth?

The fact is, how long after pregnancy a dog has her next period, or goes into estrus or heat, varies widely. Most female dogs experience a first heat cycle at the age of 6 months. Unless spayed or pregnant, they'll go into heat every six months for the rest of their lives.

Can a dog go into heat after being spayed?

It is possible for a female dog or cat that has gone through spay surgery to show signs of heat—bleeding, attracting males, and behavioral changes—after the surgery. Most likely some ovarian tissue was left intact during surgery and that tissue releases hormones that can cause the animal to go into heat.

Do spayed dogs go into heat?

It is this estrogen that triggers your dog to go into heat. When your pet is spayed, the entire reproductive tract (including both ovaries and the uterus) is surgically removed. Therefore, your spayed dog no longer has ovaries, produces estrogen, or goes into heat.

How often do dogs go into heat?

How often does a female dog come into heat? Most dogs come into heat twice per year, or about every six months, although the interval can vary between breeds and from dog to dog. Small breed dogs may cycle three times per year, while giant breed dogs may only cycle once every 12 months.

What happens when dogs go into heat?

Female dogs that aren't spayed go into season or into heat approximately every 6 months. This can be a real annoyance to pet owners and to all other pets in the household. The heat cycle for a female dog lasts about 3 weeks. During that time her vulva will swell and she will have a bloody discharge.

What age to dogs go into heat?

Although six months old is the average age of a dog's first heat, this can vary widely. Some dogs can go into heat as young as four months, while larger breeds may be as old as two years before their first heat. Responsible breeders never breed a dog on her first or even her second heat.

Do male dogs go into heat?

Sexually mature female dogs typically go into heat twice a year. The most noticeable change during this time occurs at the start of their heat, called proestrus. Male dogs do not go into heat like females.

What age do dogs go into heat?

Although six months old is the average age of a dog's first heat, this can vary widely. Some dogs can go into heat as young as four months, while larger breeds may be as old as two years before their first heat. Responsible breeders never breed a dog on her first or even her second heat.

Do spayed dogs still go into heat?

It is this estrogen that triggers your dog to go into heat. When your pet is spayed, the entire reproductive tract (including both ovaries and the uterus) is surgically removed. Therefore, your spayed dog no longer has ovaries, produces estrogen, or goes into heat.

What month do dogs go into heat?

Although six months old is the average age of a dog's first heat, this can vary widely. Some dogs can go into heat as young as four months, while larger breeds may be as old as two years before their first heat. Responsible breeders never breed a dog on her first or even her second heat.

Do dogs vomit before going into heat?

Dogs in heat can sometimes suffer mood changes and mild gastrointestinal upset. However, a dog in heat that starts vomiting is always a concern. It is also possible that your pet's vomiting is unrelated to her heat cycle. Common causes of vomiting in dogs are eating new foods or treats or ingesting parts of toys.

Do dogs ever stop going into heat?

Dogs never stop going into heat although as they get older it may become less frequent. Even if she didn't go into heat for a year or more she will eventually go back into heat. "After years of heat cycles without getting pregnant, the lining of a dogs uterus gets thicker and less pliable.

How many times a year do dogs go into heat?

Most dogs come into heat twice per year, or about every six months, although the interval can vary between breeds and from dog to dog. Small breed dogs may cycle three times per year, while giant breed dogs may only cycle once every 12 months.

Does a spayed dog still go into heat?

It is this estrogen that triggers your dog to go into heat. When your pet is spayed, the entire reproductive tract (including both ovaries and the uterus) is surgically removed. Therefore, your spayed dog no longer has ovaries, produces estrogen, or goes into heat.

How old is a dog when they go into heat?

Although six months old is the average age of a dog's first heat, this can vary widely. Some dogs can go into heat as young as four months, while larger breeds may be as old as two years before their first heat. Responsible breeders never breed a dog on her first or even her second heat.

At what age does a dog go into heat?

Although six months old is the average age of a dog's first heat, this can vary widely. Some dogs can go into heat as young as four months, while larger breeds may be as old as two years before their first heat. Responsible breeders never breed a dog on her first or even her second heat.

At what age does a female dog go into heat?

Although six months old is the average age of a dog's first heat, this can vary widely. Some dogs can go into heat as young as four months, while larger breeds may be as old as two years before their first heat. Responsible breeders never breed a dog on her first or even her second heat.

How many years does a dog go into heat?

Although six months old is the average age of a dog's first heat, this can vary widely. Some dogs can go into heat as young as four months, while larger breeds may be as old as two years before their first heat. Responsible breeders never breed a dog on her first or even her second heat.

How often does a female dog go into heat?

How often does a female dog come into heat? Most dogs come into heat twice per year, or about every six months, although the interval can vary between breeds and from dog to dog. Small breed dogs may cycle three times per year, while giant breed dogs may only cycle once every 12 months.

How long is a dog in heat and bleed?

The estrus cycle has four stages. The first stage is called proestrus. This lasts approximately 10 days and it is during this stage that your dog will bleed from the vaginal area. This is your dog's preparation for pregnancy phase, but she will not want to mate with a male during this time.

Can you have a brain bleed and not know it?

Other possible causes include blood diseases, brain tumors, septicemia, or drug abuse. According to one study, trauma was the most frequent cause of brain hemorrhage followed by bleeding disorders. In infants and children, brain hemorrhages are not as likely but can occur.

What age does a dog stop going into heat?

Although six months old is the average age of a dog's first heat, this can vary widely. Some dogs can go into heat as young as four months, while larger breeds may be as old as two years before their first heat. Responsible breeders never breed a dog on her first or even her second heat.

How often does a male dog go into heat?

Sexually mature female dogs typically go into heat twice a year. The most noticeable change during this time occurs at the start of their heat, called proestrus. The bitch's vulva will swell, and she will develop a vaginal discharge for a period of 7-to-10 days, a bit like a human period.

How many times does a dog go into heat?

How often does a female dog come into heat? Most dogs come into heat twice per year, or about every six months, although the interval can vary between breeds and from dog to dog. Small breed dogs may cycle three times per year, while giant breed dogs may only cycle once every 12 months.

At what age does a dog stop going into heat?

Although six months old is the average age of a dog's first heat, this can vary widely. Some dogs can go into heat as young as four months, while larger breeds may be as old as two years before their first heat. Responsible breeders never breed a dog on her first or even her second heat.

Does a dog ever stop going into heat?

Dogs never stop going into heat although as they get older it may become less frequent. Even if she didn't go into heat for a year or more she will eventually go back into heat. "After years of heat cycles without getting pregnant, the lining of a dogs uterus gets thicker and less pliable.

How do you stop a dog from going into heat?

The only permanent solution to preventing a pooch from going into heat is to have her spayed. Ideally, you should spay your dog prior to her first heat cycle, by six months of age.

How often do chihuahuas go into heat?

How Often a Chihuahua Enters Heat. Toy breed dogs will have a heat cycle every 5 to 8 months; which equates to roughly 2 times per year. It may take be several cycles before a young female falls into a regular pattern. Usually by the age of 2 years old, a Chihuahua's heat will become very predictable.

How often do Huskies go into heat?

Female dogs cycle into heat on average every six months. But this can vary, especially in the beginning, so it's a good idea to keep track. It can take some dogs 18-24 months to develop regular cycles. Small dogs will tend to go into heat more frequently, as much as three or four times a year.

What age do mastiffs go into heat?

Although six months old is the average age of a dog's first heat, this can vary widely. Some dogs can go into heat as young as four months, while larger breeds may be as old as two years before their first heat. Responsible breeders never breed a dog on her first or even her second heat.

How often do bloodhounds go into heat?

How often do female dogs come into heat? On average, this occurs about twice a year or every six months, although it varies from dog to dog. Small breeds tend to cycle more regularly than the larger breeds. The interval between heat cycles tends to be 4 to 12 months with an average of 7 months.

How often do mastiffs go into heat?

Some dogs can take up to eighteen months until their cycle becomes regular. It's a good idea to keep a record during these early days. Once it does, the average is about every six months. Smaller breeds may go into heat more frequently, as often as 3-4 times a year.

How often do Yorkies go into heat?

How Often the Heat Cycle Occurs. Your Yorkie will enter heat approximately every 5 to 8 months; therefore you should expect this phase about twice per year.

What age do Pomeranians go into heat?

If your goal is to have your female Pom spayed before the first heat, you will want to have this done early. A Pomeranian can enter her first cycle as young as 4 months old. However, the average age range for this is 6 months to 9 months.

How often do pitbulls go into heat?

Female dogs cycle into heat on average every six months. But this can vary, especially in the beginning, so it's a good idea to keep track. It can take some dogs 18-24 months to develop regular cycles. Small dogs will tend to go into heat more frequently, as much as three or four times a year.

How often do Terriers go into heat?

Female dogs cycle into heat on average every six months. But this can vary, especially in the beginning, so it's a good idea to keep track. It can take some dogs 18-24 months to develop regular cycles. Small dogs will tend to go into heat more frequently, as much as three or four times a year.

What age do Vizslas go into heat?

Although six months old is the average age of a dog's first heat, this can vary widely. Some dogs can go into heat as young as four months, while larger breeds may be as old as two years before their first heat. Responsible breeders never breed a dog on her first or even her second heat.

How often do Dalmatians go into heat?

Small dogs will tend to go into heat more frequently, as much as three or four times a year. Very large breeds, like Great Danes and St. Bernards among others, may only go into heat every twelve months. The estrus cycle usually lasts an average of three weeks, although this can vary from 2-4 weeks.

At what age does a Shih Tzu go into heat?

Small toy sized dogs like the Shih Tzu typically have their first heat relatively early. It generally happens between the young ages of 4 and 7 months old. It does surprise many owners to know that their female will still be a puppy when she first enters a cycle.

At what age does a great dane go into heat?

While most dogs go into heat twice a year, Great Danes typically only experience estrus once every 12-18 months. Keep track of your dog's cycle on a calendar, so that you are prepared and know when to begin looking for signs that it is starting.

At what age does a husky go into heat?

A female Siberian Husky will enter her first heat cycle between the ages of 6 and 12 months. Each heat cycle can last from 18 to 28 days. It takes awhile for the heat cycle of a female dog to become regular.

At what age does a morkie go into heat?

Usually your dog will go into heat every 6-7 months though again each dog is different and can go back into heat as early as 4 months or not for 12 months. Most however are average. During the first part of a dogs heat period you will notice swelling of the vulva, possibly an increase in urination and bleeding.

How soon does a female puppy go into heat?

Puberty or sexual maturity in the female dog usually occurs around six months of age. The smaller breeds tend to go into oestrus or "heat" earlier and some females can have their first "heat" cycle as early as four months of age.

How often does a great dane go into heat?

Small dogs will tend to go into heat more frequently, as much as three or four times a year. Very large breeds, like Great Danes and St. Bernards among others, may only go into heat every twelve months. The estrus cycle usually lasts an average of three weeks, although this can vary from 2-4 weeks.

How often does a Boston terrier go into heat?

Small dogs will tend to go into heat more frequently, as much as three or four times a year. Very large breeds, like Great Danes and St. Bernards among others, may only go into heat every twelve months. The estrus cycle usually lasts an average of three weeks, although this can vary from 2-4 weeks.

How often do Yorkies go into heat a year?

How Often the Heat Cycle Occurs. Your Yorkie will enter heat approximately every 5 to 8 months; therefore you should expect this phase about twice per year.

How often does a Great Pyrenees go into heat?

It's a good idea to keep a record during these early days. Once it does, the average is about every six months. Smaller breeds may go into heat more frequently, as often as 3-4 times a year. Larger dogs, like Irish Wolfhounds, St. Bernards and Great Danes may only go into heat every 12-18 months.

Why is my dog not coming into heat?

There are some times when your female dog, or bitch, has an abnormal heat such as a silent or split heat or does not come into heat at all. It is important to watch any intact male dogs closely; they will be able to detect a silent heat. Possible causes of why your dog is not coming into heat include: Silent heat cycle.

At what age does a Great Pyrenees go into heat?

Although six months old is the average age of a dog's first heat, this can vary widely. Some dogs can go into heat as young as four months, while larger breeds may be as old as two years before their first heat. Responsible breeders never breed a dog on her first or even her second heat.

What age does a male puppy go into heat?

Although six months old is the average age of a dog's first heat, this can vary widely. Some dogs can go into heat as young as four months, while larger breeds may be as old as two years before their first heat. Responsible breeders never breed a dog on her first or even her second heat.

How many times a year do Rottweilers go into heat?

The breeding cycle of a Rottweiler female is comparable to those of any domestic dog. She'll go into heat approximately every six months*, be in heat for approximately 2–3 weeks, and if she's successfully bred, gestation is approximately 63 days from ovulation.

Can a male dog cause a female to go into heat?

Will having male dog around help to bring female into heat… No, usually a male dog does not have to be present to get a female to go into heat. The cycle is programmed into her ovaries, and a female dog will have a heat, usually twice a year or so, whether there is a male dog around or not.

Should you let your dog go into heat before spaying?

A: Medically, it's better to spay your dog before her first heat. People who wait to spay their dogs until after their second heat greatly increase the risk of mammary tumors in their pets. Once they've had several heats, intact female dogs have a one out of four chance of developing mammary tumors.

How often do female dogs go into heat?

How often does a female dog come into heat? Most dogs come into heat twice per year, or about every six months, although the interval can vary between breeds and from dog to dog. Small breed dogs may cycle three times per year, while giant breed dogs may only cycle once every 12 months.

At what age do dogs go into heat?

Although six months old is the average age of a dog's first heat, this can vary widely. Some dogs can go into heat as young as four months, while larger breeds may be as old as two years before their first heat. Responsible breeders never breed a dog on her first or even her second heat.

What time of the year do dogs go into heat?

Most dogs come into heat twice per year, or about every six months, although the interval can vary between breeds and from dog to dog.

Should I let my dog go into heat before spaying?

All the medical evidence suggests a dog should be spayed before her first heat. It's much easier for her then because it's a much easier surgery at that time. So unless you spay or neuter all the puppies before placing them, the new owners may let their dog breed as well.

Are dogs fully grown when they go into heat?

Dogs can go into heat as young as four months in smaller breeds, but averages about six months old. It is strongly advised not to breed young female dogs during their first and second cycle. Their eggs are not yet mature and the dog hasn't reached full maturity.

What time of year do dogs go into heat?

Most dogs come into heat twice per year, or about every six months, although the interval can vary between breeds and from dog to dog.

How many years do female dogs go into heat?

Although six months old is the average age of a dog's first heat, this can vary widely. Some dogs can go into heat as young as four months, while larger breeds may be as old as two years before their first heat.

How often do male dogs go into heat?

How Often Do Female Dogs Come Into Heat? On average this occurs about twice a year or every six months, although it varies from dog to dog.

What age do male dogs go into heat?

Although six months old is the average age of a dog's first heat, this can vary widely. Some dogs can go into heat as young as four months, while larger breeds may be as old as two years before their first heat. Responsible breeders never breed a dog on her first or even her second heat.

What times of year do dogs go into heat?

Most dogs come into heat twice per year, or about every six months, although the interval can vary between breeds and from dog to dog.

What age do dogs stop going into heat?

Although six months old is the average age of a dog's first heat, this can vary widely. Some dogs can go into heat as young as four months, while larger breeds may be as old as two years before their first heat. Responsible breeders never breed a dog on her first or even her second heat.

At what age do dogs start going into heat?

Although six months old is the average age of a dog's first heat, this can vary widely. Some dogs can go into heat as young as four months, while larger breeds may be as old as two years before their first heat. Responsible breeders never breed a dog on her first or even her second heat.

Can you have heavy bleeding during pregnancy and not miscarry?

Research shows that 15 percent to 25 percent of women experience some sort of bleeding during this time. About half of women who have first-trimester vaginal bleeding have a miscarriage. That might sound terrifying, but keep in mind this also means that half of the women who have bleeding don't miscarry.

At what age do male dogs go into heat?

Although six months old is the average age of a dog's first heat, this can vary widely. Some dogs can go into heat as young as four months, while larger breeds may be as old as two years before their first heat. Responsible breeders never breed a dog on her first or even her second heat.

Do dogs go into heat every 6 months?

After dogs experience their first estrus cycle, they will continue to go into heat approximately every 6 months. This can also vary from breed to breed. Smaller breeds might cycle three times a year, while larger breeds might only cycle once a year. During the cycle, dogs will be in heat for about 2-3 weeks.

At what age do dogs stop going into heat?

Although six months old is the average age of a dog's first heat, this can vary widely. Some dogs can go into heat as young as four months, while larger breeds may be as old as two years before their first heat.

How long can a dog get pregnant after going into heat?

There's a relatively small window when your dog is most fertile during the heat cycle; it may begin about nine or ten days after she goes into heat and lasts about five days. However, she can become pregnant until the end of the cycle.

Do female dogs go into heat after being spayed?

It is possible for a female dog or cat that has gone through spay surgery to show signs of heat—bleeding, attracting males, and behavioral changes—after the surgery. Most likely some ovarian tissue was left intact during surgery and that tissue releases hormones that can cause the animal to go into heat.

At what age do female dogs stop going into heat?

When do female dogs stop going into heat? My dog hasn't had a season in 3 years and she's nearly 7 years. At this age she should still come in season. It is possible that your dog may have had a hormonal disease or ovarian disease that stopped her cycling.

Are dogs full grown when they go into heat?

Dogs belonging to smaller breeds will usually be sexually mature sooner than larger breeds. Typically, male dogs are capable of reproducing at six months but attain full sexual maturity when they're about 12-15 months old. Similarly, female dogs have their first season of heat when they are between 6-12 months old.

How can you tell if a dog is going into heat?

Signs That Your Dog Is in Heat Swollen vulva. This non-painful swelling typically occurs a few days before any discharge or bleeding will occur. Bleeding. A bloody discharge from your dog is usually the first sign of heat you will notice. Mounting behavior. Your dog may try to mount other dogs, objects, or your leg.

Can a dog go into heat 8 weeks after having puppies?

The fact is, how long after pregnancy a dog has her next period, or goes into estrus or heat, varies widely. Most female dogs experience a first heat cycle at the age of 6 months. Unless spayed or pregnant, they'll go into heat every six months for the rest of their lives.

How soon can a dog go into heat after having puppies?

The fact is, how long after pregnancy a dog has her next period, or goes into estrus or heat, varies widely. Most female dogs experience a first heat cycle at the age of 6 months. Unless spayed or pregnant, they'll go into heat every six months for the rest of their lives.

Can a dog go into a coma?

Coma in Dogs. Comas can be caused by a variety of problems in dogs, from extreme temperatures to adverse reactions to prescription pet medication. A coma means your dog is unresponsive but breathing on his own with adequate pulses. It is commonly seen in diabetic dogs in which the blood sugar has not been regulated.

At what age do toy poodles go into heat?

Although six months old is the average age of a dog's first heat, this can vary widely. Some dogs can go into heat as young as four months, while larger breeds may be as old as two years before their first heat. Responsible breeders never breed a dog on her first or even her second heat.

What age do Yorkies stop going into heat?

The dog usually comes in heat in six month cycles and the first one is seen when the dog is six to 18 months old. For small breeds such as the Yorkshire terrier, the first heat comes sooner. A Yorkie becomes sexually mature during six to 18 months old. During this period the female dog comes into heat.

How often do English setters go into heat?

Small dogs will tend to go into heat more frequently, as much as three or four times a year. Very large breeds, like Great Danes and St. Bernards among others, may only go into heat every twelve months. The estrus cycle usually lasts an average of three weeks, although this can vary from 2-4 weeks.

How old are cats when they go into heat?

What to expect when your cat is in heat. Most female cats will go into heat by 6 months of age. But certain environmental factors can cause it to happen more quickly. And certain breeds—like Siamese—may go into heat as early as 4 months, while for other breeds 10 months old is a more typical age for going into heat.

What age do Shih Tzu go into heat?

A Shih Tzu will first go into heat at about 5 months. Like any other animal, including humans, the start period may differ. Five months is, in general, when it starts, but it may go over or just slightly under. You will notice that the Shih Tzu has gone into heat when you start to see light bleeding.

What age do French Bulldogs go into heat?

Although six months old is the average age of a dog's first heat, this can vary widely. Some dogs can go into heat as young as four months, while larger breeds may be as old as two years before their first heat. Responsible breeders never breed a dog on her first or even her second heat.

At what age do mastiffs go into heat?

Although six months old is the average age of a dog's first heat, this can vary widely. Some dogs can go into heat as young as four months, while larger breeds may be as old as two years before their first heat. Responsible breeders never breed a dog on her first or even her second heat.

How often do toy poodles go into heat?

Small dogs will tend to go into heat more frequently, as much as three or four times a year. Very large breeds, like Great Danes and St. Bernards among others, may only go into heat every twelve months. The estrus cycle usually lasts an average of three weeks, although this can vary from 2-4 weeks.