Can dogs get pregnant when not in heat?

My puppy first heat

Best Answer

Female dogs can only get pregnant when they're in heat.

A dog will begin her heat cycle after about 6 months of age.

Some females will show physical signs of readiness – their discharge will lighten in color, and they will “flag,” or lift their tail up and to the side.

How long last the heat in a female dog?

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Related Questions

Can female dogs get pregnant when not in heat?

Female dogs can only get pregnant when they're in heat. A dog will begin her heat cycle after about 6 months of age. Some females will show physical signs of readiness – their discharge will lighten in color, and they will “flag,” or lift their tail up and to the side.

Can dogs get pregnant when not on heat?

Female dogs can only get pregnant when they're in heat. A dog will begin her heat cycle after about 6 months of age. Some females will show physical signs of readiness – their discharge will lighten in color, and they will “flag,” or lift their tail up and to the side.

Can a dog become pregnant when not in heat?

Female dogs can only get pregnant when they're in heat. A dog will begin her heat cycle after about 6 months of age. Some females will show physical signs of readiness – their discharge will lighten in color, and they will “flag,” or lift their tail up and to the side.

Dog pregnancy - Dog Heat Cycle & Period - Bhola Shola

Can dogs get pregnant if they're not in heat?

Female dogs can only get pregnant when they're in heat. A dog will begin her heat cycle after about 6 months of age. Some females will show physical signs of readiness – their discharge will lighten in color, and they will “flag,” or lift their tail up and to the side.

Can a female dog get pregnant if not in heat?

Female dogs can only get pregnant when they're in heat. A dog will begin her heat cycle after about 6 months of age. Some females will show physical signs of readiness – their discharge will lighten in color, and they will “flag,” or lift their tail up and to the side.

Can a dog get pregnant if not in heat?

Female dogs can only get pregnant when they're in heat. A dog will begin her heat cycle after about 6 months of age. Some females will show physical signs of readiness – their discharge will lighten in color, and they will “flag,” or lift their tail up and to the side.

Can a dog get pregnant if it's not in heat?

Female dogs can only get pregnant when they're in heat. A dog will begin her heat cycle after about 6 months of age. Some females will show physical signs of readiness – their discharge will lighten in color, and they will “flag,” or lift their tail up and to the side.

Can a dog get pregnant not in heat?

Female dogs can only get pregnant when they're in heat. A dog will begin her heat cycle after about 6 months of age. Some females will show physical signs of readiness – their discharge will lighten in color, and they will “flag,” or lift their tail up and to the side.

How Young Can a Dog Get Pregnant? Dog Breeding Timeline

When can a dog in heat get pregnant?

Female dogs can only get pregnant when they're in heat. A dog will begin her heat cycle after about 6 months of age.

When can a dog not get pregnant?

Dogs can get pregnant at an early age! A female puppy can get pregnant at 6 months old and can have puppies well into old age, depending on her breed. Some dogs stop being able to get pregnant after 3 years old, for some dogs, it's 5 years old, and other dogs can continue to get pregnant even older than that.

Can dogs mate when not in heat?

Male and female dogs alike may mount a variety of things for a variety of reasons. Of course a female dog in heat will attract suitors, but male dogs -- neutered or intact -- may attempt to mate with a female who's not in heat.

Can a dog get pregnant even though she's not in heat?

Female dogs can only get pregnant when they're in heat. A dog will begin her heat cycle after about 6 months of age. Some females will show physical signs of readiness – their discharge will lighten in color, and they will “flag,” or lift their tail up and to the side.

Can a female dog get pregnant if she's not in heat?

Female dogs can only get pregnant when they're in heat. A dog will begin her heat cycle after about 6 months of age. Some females will show physical signs of readiness – their discharge will lighten in color, and they will “flag,” or lift their tail up and to the side.

Can A Dog Get Pregnant If Not In Heat?

When can a dog get pregnant after 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.

When a dog is in heat when can she get pregnant?

2. Female dogs can only get pregnant when they're in heat. A dog will begin her heat cycle after about 6 months of age.

When a dog is in heat when can it get pregnant?

Female dogs can only get pregnant when they're in heat. A dog will begin her heat cycle after about 6 months of age. Some females will show physical signs of readiness – their discharge will lighten in color, and they will “flag,” or lift their tail up and to the side.

Do dogs not eat when in heat?

Many female dogs may lose their appetite during their heat. Giving extra treats, some meat baby food with no garlic or onion, may help entice her to eat. If your dog gets diarrhea during her heat, try to feed some boiled hamburger with the fat drained off, with lots of rice.

Will dogs mate when not in heat?

Of course a female dog in heat will attract suitors, but male dogs -- neutered or intact -- may attempt to mate with a female who's not in heat.

Do dogs mate when not in heat?

Male and female dogs alike may mount a variety of things for a variety of reasons. Of course a female dog in heat will attract suitors, but male dogs -- neutered or intact -- may attempt to mate with a female who's not in heat.

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.

Can a dog get pregnant twice in the same heat?

Yes. So can a female human, though a dog's biology makes it somewhat more likely. At root, the way you get offspring in a single pregnancy with multiple fathers is because sperm from different males is in the system and active at the time that ripened eggs are making their way down.

Can a dog only get pregnant while in heat?

Female dogs can only get pregnant when they're in heat. A dog will begin her heat cycle after about 6 months of age. Some females will show physical signs of readiness – their discharge will lighten in color, and they will “flag,” or lift their tail up and to the side.

Can a dog get pregnant in first heat?

Dogs can only become pregnant when they are in heat. There are three stages of a female dog's heat cycle, which begins around 6 months old when she gets her first heat. Female dogs stay in heat for around 2 - 4 weeks. The second phase is when your dog can get pregnant, this is known as estrus.

At what point in heat can a dog get pregnant?

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.

Can a dog get pregnant without being in heat?

Female dogs can only get pregnant when they're in heat. A dog will begin her heat cycle after about 6 months of age. Some females will show physical signs of readiness – their discharge will lighten in color, and they will “flag,” or lift their tail up and to the side.

Can a dog get pregnant in a silent heat?

Female dogs have heat cycles, or estrus. During this time, the female is receptive to a male and has the ability to reproduce. This is when your dog goes into heat but does not exhibit any of the normal signs of a regular heat cycle. Your female can still become pregnant during a silent heat.

Can dogs mate when not on heat?

Some female dogs experience heavy vaginal bleeding during estrus, while other dogs have minimal bleeding. From the beginning of the heat period, she will be attractive to male dogs, but will usually not be receptive, or allow mating until about 7 to10 days into the cycle.

Can a dog get pregnant before heat?

A dog can't get pregnant before going into heat for the first time. “Heat” is when she's ovulating. But it is bad for a dog to get pregnant at a young age, because her body isn't fully developed yet. A dog can first become pregnant during her first estrus cycle (“heat”), but not before then.

When a dog is on heat when can it get pregnant?

Female dogs can only get pregnant when they're in heat. A dog will begin her heat cycle after about 6 months of age. Some females will show physical signs of readiness – their discharge will lighten in color, and they will “flag,” or lift their tail up and to the side.

Can dogs be in heat while pregnant?

Female dogs can only get pregnant when they're in heat. A dog will begin her heat cycle after about 6 months of age. If you cannot be absolutely certain of identifying the signs of heat in your female, and securing her during this time, spay her.

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.

Do dogs mate when they are not in heat?

Male and female dogs alike may mount a variety of things for a variety of reasons. Of course a female dog in heat will attract suitors, but male dogs -- neutered or intact -- may attempt to mate with a female who's not in heat.

Can puppies get pregnant first heat?

Signs that Your Dog is Able to Get Pregnant. Dogs can get pregnant at an early age! A female puppy can get pregnant at 6 months old and can have puppies well into old age, depending on her breed. There are three stages of a female dog's heat cycle, which begins around 6 months old when she gets her first heat.

Do dogs get sleepy when in heat?

Most dogs are restless during the heat. However, there are still high numbers of dogs who appear to be tired. They have decreased activity, appetite and interest in other thing that would normally amuse her.

Do dogs get depressed when in heat?

Lethargy is normal for dogs who are in heat, and is due to the hormonal and prostaglandin changes that occur with a heat. This lethargy will pass when her heat is over, and there's really nothing you can do for her since it is due to hormonal and prostaglandin changes.

What happens if dog gets pregnant in first heat?

A dog can't get pregnant before going into heat for the first time. But it is bad for a dog to get pregnant at a young age, because her body isn't fully developed yet. Having puppies before she's at least two years old risks complications and eventual health problems.

Do dogs get moody when in heat?

When a dog goes into heat -- which is her period of estrus -- she has a lot of hormones surging around her body, which can cause some changes in mood or behavior. The average adult female dog goes into heat twice each year. It's generally advisable to get your dog spayed to avoid this.

Should dogs get pregnant first heat?

Dogs can only become pregnant when they are in heat. There are three stages of a female dog's heat cycle, which begins around 6 months old when she gets her first heat. Female dogs stay in heat for around 2 - 4 weeks. The second phase is when your dog can get pregnant, this is known as estrus.

Can a dog get pregnant the first week of heat?

Whatever the case may be, you're reading this article because you want to know when dogs can get pregnant. The answer is that dogs generally experience their first estrus cycle, the part of the reproductive cycle when they can fall pregnant, at around six months of age, and most dogs come into heat twice per year.

Can a dog get pregnant during a silent heat?

Female dogs have heat cycles, or estrus. This is when your dog goes into heat but does not exhibit any of the normal signs of a regular heat cycle. Your female can still become pregnant during a silent heat.

What stage of heat can a dog get pregnant?

Dogs will have their first estrous (reproductive or heat) cycle when they reach puberty. Each cycle consists of several stages; the stage called estrus refers to when the female can become pregnant. Often a dog that is in the estrus stage is said to be in heat or in season.

Can a dog get pregnant before she goes into heat?

Before her heat, she is not releasing eggs, therefore she cannot get pregnant. A dog can first become pregnant during her first estrus cycle (“heat”), but not before then. Especially considering female dogs can go on heat from the age of four months, when they are little more than puppies themselves.

Can a dog get pregnant before first heat?

Dogs can only become pregnant when they are in heat. There are three stages of a female dog's heat cycle, which begins around 6 months old when she gets her first heat. Female dogs stay in heat for around 2 - 4 weeks. The second phase is when your dog can get pregnant, this is known as estrus.

Can dogs get pregnant before their first heat?

A dog can't get pregnant before going into heat for the first time. “Heat” is when she's ovulating. But it is bad for a dog to get pregnant at a young age, because her body isn't fully developed yet. A dog can first become pregnant during her first estrus cycle (“heat”), but not before then.

How many days after heat can a dog get pregnant?

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.

Can a dog get pregnant during first heat?

Dogs can get pregnant at an early age! A female puppy can get pregnant at 6 months old and can have puppies well into old age, depending on her breed. Dogs can only become pregnant when they are in heat. There are three stages of a female dog's heat cycle, which begins around 6 months old when she gets her first heat.

Why do dogs nest when not pregnant?

False pregnancy in dogs occurs to females that are not spayed. Your dog can also experience behavior changes such as moodiness, lethargic, aggression, restlessness and whimpering. She may even carry a stuffed toy around and treat it like a puppy. Your dog is nesting because she believes that she is having puppies.

When can Yorkies get pregnant?

Proper Age. It is recommended that a female is bred after her 2nd heat and before she is 5 years old. Now, a female can enter heat as young as 4 months old, this is much too young to become pregnant.

Is my dog in heat or pregnant?

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.

When can chihuahua get pregnant?

A female puppy can get pregnant at 6 months old and can have puppies well into old age, depending on her breed. Some dogs stop being able to get pregnant after 3 years old, for some dogs, it's 5 years old, and other dogs can continue to get pregnant even older than that.

When can husky get pregnant?

At what age can the siberian husky dog get pregnant. Hi dudette, Dogs can become pregnant anytime they go into a heat cycle which can start from four to eighteen months old. Once the heat cycle has begun she should go into heat every six months.

When can a female dog get pregnant?

Female dogs can only get pregnant when they're in heat. A dog will begin her heat cycle after about 6 months of age.

When can female dogs get pregnant?

Female dogs can only get pregnant when they're in heat. A dog will begin her heat cycle after about 6 months of age.

Can a pregnant dog not look pregnant?

False pregnancy is a common occurrence in dogs. A few weeks after going into heat, a dog can exhibit signs of pregnancy, such as enlarged nipples and increased appetite, without actually being pregnant. Check with your vet to make absolutely sure whether your dog is pregnant.

Can a dog be in heat while pregnant?

Female dogs can only get pregnant when they're in heat. A dog will begin her heat cycle after about 6 months of age. If you cannot be absolutely certain of identifying the signs of heat in your female, and securing her during this time, spay her.

When can a dog get pregnant?

Female dogs can only get pregnant when they're in heat. A dog will begin her heat cycle after about 6 months of age.

Why does my dog not get pregnant?

Infertility in female dogs is the inability to produce live offspring. This can be caused by failure to ovulate, cycle normally, accept a male, conceive, maintain the pregnancy or deliver live puppies at full term. The most common cause of infertility in female dogs is bad timing.

How long after a dog goes in heat can she get pregnant?

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.

How long after a dog is in heat can it get pregnant?

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.

How long after a dog is in heat can she get pregnant?

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.

Can you get a dog when pregnant?

Ultrasound is safe during pregnancy. Dogs have higher levels of a hormone called relaxin when they're pregnant. If you don't take your dog to the vet until her 4th week of pregnancy, the doctor can feel your dog's belly to confirm puppies are on the way.

Can a dog get pregnant when bleeding?

Dogs get pregnant while bleeding.) Some dogs cycle every six months; more primitive breeds, such as Basenjis or Tibetan Mastiffs, come into heat only once a year.

When a dog can get pregnant?

Whatever the case may be, you're reading this article because you want to know when dogs can get pregnant. The answer is that dogs generally experience their first estrus cycle, the part of the reproductive cycle when they can fall pregnant, at around six months of age, and most dogs come into heat twice per year.

Can dogs be aggressive when in heat?

If she is aggressive towards other dogs, keep her away from them during her cycle. Unspayed females will sometimes compete for a male dog's attention by fighting. So it is best to spay her as soon as possible because while heat related aggression is usually temporary it can lead to long term problems with aggression.

Will dogs mate if not in heat?

Of course a female dog in heat will attract suitors, but male dogs -- neutered or intact -- may attempt to mate with a female who's not in heat. Mounting isn't just boys being boys; female dogs engage in mounting behavior as well.

When can my dog get pregnant?

Female dogs can only get pregnant when they're in heat. A dog will begin her heat cycle after about 6 months of age.

Can a dog mate and not get pregnant?

Some people believe a dam cannot get pregnant during her first heat cycle. Others believe a pair of dogs must mate multiple times before pregnancy can occur. A female dog can be impregnated when mating with a male as long as they are both sexually fertile, which will usually happen by the time they are one year old.

Can a male dog penetrate a female not in heat?

No a female dog cannot normally be penetrated when not in heat. If she is a lot of damage can be done. If you do not plan on mating them neutering him may help him a lot. If she is not spayed she will be coming in heat soon and you will need a way to keep them apart the whole 3 ore more weeks she is in heat.

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.

Can dogs mate if the female is not in heat?

Of course a female dog in heat will attract suitors, but male dogs -- neutered or intact -- may attempt to mate with a female who's not in heat. Mounting isn't just boys being boys; female dogs engage in mounting behavior as well.

Can puppies get pregnant before their first heat?

Dogs can get pregnant at an early age! A female puppy can get pregnant at 6 months old and can have puppies well into old age, depending on her breed. Dogs can only become pregnant when they are in heat. There are three stages of a female dog's heat cycle, which begins around 6 months old when she gets her first heat.

Can a puppy get pregnant before her first heat?

A dog can first become pregnant during her first estrus cycle (“heat”), but not before then. Most come into season at 6 months and at that age bones and joints are not fully grown, its like a 12 year old girl getting pregnant, its bad for the same reasons.

Can liquid come out of nipples when not pregnant?

You might have to squeeze the nipple to get the fluid to come out, or it could seep out on its own. Nipple discharge is common during your reproductive years, even if you're not pregnant or breastfeeding. Discharge is usually not serious.

Do dogs get more tired when in heat?

Most dogs are restless during the heat. However, there are still high numbers of dogs who appear to be tired. They have decreased activity, appetite and interest in other thing that would normally amuse her.

Do female dogs get depressed when in heat?

Lethargy is normal for dogs who are in heat, and is due to the hormonal and prostaglandin changes that occur with a heat. This lethargy will pass when her heat is over, and there's really nothing you can do for her since it is due to hormonal and prostaglandin changes.

Do female dogs get aggressive when in heat?

Aggression in female dogs during their heat is a common complaint. Drastic hormone changes can adversely affect a female dog's mood and can predispose to acts of aggression even if she has never been aggressive before. If your dog is getting too hot to handle while in heat be sure to take the necessary precautions.

Do female dogs nipples get bigger when in heat?

Swollen nipples - Sometimes, but not always, the nipples and breasts will swell slightly. This can also be a sign of a phantom pregnancy, when a female may begin to show signs of being pregnant even if she's not. So, watch if this happens, but it usually resolves itself in a few weeks after the cycle ends.

How can I produce milk when not pregnant?

Lactation is common after a woman has given birth, and it can sometimes occur during pregnancy too. However, it is possible for both women and men to produce a milky discharge from one or both nipples without being pregnant or breastfeeding. This form of lactation is called galactorrhea.

Does a dog's nipples get bigger when in heat?

Swollen nipples - Sometimes, but not always, the nipples and breasts will swell slightly. This can also be a sign of a phantom pregnancy, when a female may begin to show signs of being pregnant even if she's not. So, watch if this happens, but it usually resolves itself in a few weeks after the cycle ends.

Do male dogs get aggressive when in heat?

Male dogs will become interested in her and may fight over her. Other female dogs may be aggressive toward her and she may be aggressive back. If you don't want your dog mating with other dogs while she's in heat, it's important that you keep your dog away from male dogs during this time.

What should u not eat when pregnant?

Foods You Shouldn't Eat While Pregnant. Raw Meat: Uncooked seafood and rare or undercooked beef or poultry should be avoided because of the risk of contamination with coliform bacteria, toxoplasmosis, and salmonella. Deli Meat: Deli meats have been known to be contaminated with listeria, which can cause miscarriage.

What should u not do when pregnant?

But because the health and safety of your growing baby is essential, here's a list of 11 things not to do while pregnant. Don't eat these foods. Don't paint the nursery. Don't overdo it on the caffeine. Don't take certain medications. Don't wear stilettos. Don't hang out in the hot tub or sauna. Don't change the kitty litter.

When can a Shih Tzu get pregnant?

A large dog breed can take as long as 18 months to reach sexual maturity; but a Shih Tzu reaches sexual maturity around 8 to 9 months of age.

When can female German shepherds get pregnant?

A female puppy can get pregnant at 6 months old and can have puppies well into old age, depending on her breed. Some dogs stop being able to get pregnant after 3 years old, for some dogs, it's 5 years old, and other dogs can continue to get pregnant even older than that.

When can female cat get pregnant?

A female cat can get pregnant when she's as young as 4 months old, unless she's been spayed to prevent that. Queens can keep going into heat every 2 to 3 weeks from the spring through the early fall, making them ready to reproduce more often than not. A cat's pregnancy lasts about 63-65 days.

When can a female Rottweiler get pregnant?

According to the Guardian Rottweilers website, female Rottweiler dogs can reach sexual maturity as early as 6 months of age, though they should ideally not become pregnant this young. Most Rottweilers will not reach full growth until they are closer to 2 years of age.

Can a girl push sperm out and not get pregnant?

In fact, if a woman does douche after intercourse, there's a possibility that it may actually push the sperm further up through the cervix, making it even easier for sperm to join with an egg. Pregnancy can happen when ejaculate or pre-ejaculate gets in the vagina.

How many days after period can you not get pregnant?

The likelihood of getting pregnant right before your period is extremely low. For women who have a typical cycle of 28 to 30 days or longer and their cycles are regular, it is fairly safe to say that your ovulation occurred between Day 11 and Day 21. The egg is only available for 12 to 24 hours for conception.

Can dogs mate when not in season?

Male and female dogs alike may mount a variety of things for a variety of reasons. Of course a female dog in heat will attract suitors, but male dogs -- neutered or intact -- may attempt to mate with a female who's not in heat.

Can you get pregnant if you're not ovulating?

There are only six days during any cycle when a woman can get pregnant - the five days leading up to ovulation and the 24 hours after ovulation. This is because sperm can live for up to 5 days in a woman's body, and the ovum lives for only 12-24 hours.

When can a Yorkie get pregnant?

This will vary, but it will mostly likely begin when she is still a young puppy. It can happen as young as when she is 5 months old.Or it may begin as late as 14 months. If you have an un-spayed female that has not had a heat by the age of 15 months,she should be taken for a checkup.

When can a Pomeranian get pregnant?

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. Some can be late bloomers, entering as late as 1-year-old, although this is rare.

What happens if a dog gets pregnant first heat?

A dog can't get pregnant before going into heat for the first time. “Heat” is when she's ovulating. But it is bad for a dog to get pregnant at a young age, because her body isn't fully developed yet. Often heats are suppressed by this dominance by the higher ranked dogs, so mating at 6 months is not an option.

When can a toy poodle get pregnant?

Safely Breeding. A female can become pregnant as soon as she enters her first heat. This can be as young as 6 months old. However, a female should be at least 2 years old before she is bred.

When can a husky get pregnant?

At what age can the siberian husky dog get pregnant. Hi dudette, Dogs can become pregnant anytime they go into a heat cycle which can start from four to eighteen months old. Once the heat cycle has begun she should go into heat every six months.

Why do dogs produce milk when not pregnant?

Female dogs may also produce milk when experiencing a false pregnancy or when another creature attempts to nurse from her. A false pregnancy is a condition where a female dog exhibits various symptoms of pregnancy, such as producing milk and building a nest for her puppies, but is not pregnant.

Is it normal for male dog not to eat when around a female in heat?

Separation anxiety is a common cause of poor appetite in dogs. Breeding activity - There have been many cases of a male dog not eating when a female is in heat nearby. A male can sometimes become so obsessed with the scent of the female that he will not engage in other normal activities such as playing and sleeping.

Can a dog get pregnant in seconds?

Dogs can only become pregnant when they are in heat. There are three stages of a female dog's heat cycle, which begins around 6 months old when she gets her first heat. Female dogs stay in heat for around 2 - 4 weeks. The second phase is when your dog can get pregnant, this is known as estrus.

Is it normal for a male dog to not eat when a female is in heat?

Breeding activity - There have been many cases of a male dog not eating when a female is in heat nearby. Generally, the situation will resolve itself as the female passes out of her heat cycle, but if your dog has lost a dramatic amount of weight, it may help to tempt him with foods he is not usually allowed to have.