Could letting my male dog breed change his behavior?

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It depends very much on the individual dog. Some don't change at all - some become quite seriously dog-aggressive to other males. Some become a nightmare when there's a nearby bitch in season whilst others aren't bothered unless she's presented to them on a plate. Unfortunately you won't know until after the event.
FAQ
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Behavior Changes Caused by Flea Bites.

Fleas can also cause your pet to behave differently - your cat or dog might seem very skittish and jumpy in response to bites and discomfort.

And, you might notice your pet avoiding certain previously comfortable spots in the house, which might be associated with fleas and bites.

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Pet owners frequently believe that their pet will "change" after their spaying or neutering surgery.

Most pets do change after their surgery; however, they change for the better.

What may change after a dog is spayed or neutered is problem aggression, hardheaded behavior and roaming behavior.

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Behavior changes.

Since the beginning of the heat, your dog's behavior may change.

Most dogs become restless; however, it's not a rarity when a dog becomes quite the oppositeโ€”less active.

Also, since during the heat cycle your female dog will be attractive to male dogs, she most likely will not be willing to breed.

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Reason #7: Changes in Routine.

Changing the routine can be stressful for your dog, and may cause your dog to act out.

Just like us, dogs need a sense of security.

Drastic Changes in environment or routine can really throw them off, causing anxiety that is commonly expressed as problem behavior.

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Neutering is very effective for reducing your male dog's sexual appetite; however, it can also activate other behavioral symptoms in them that you may not expect. One of the most well-known adverse effects of having your male dog neutered is that they will often become more aggressive.
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Behavior changes.

Since the beginning of the heat, your dog's behavior may change.

If your dog becomes restless, read our article on how to calm a female dog in heat.

Also, since during the heat cycle your female dog will be attractive to male dogs, she most likely will not be willing to breed.

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Pet owners frequently believe that their pet will "change" after their spaying or neutering surgery.

Most pets do change after their surgery; however, they change for the better.

What may change after a dog is spayed or neutered is problem aggression, hardheaded behavior and roaming behavior.

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