Why do dogs bite when excited?

Redirected aggression - This occurs when a dog is overly excited or aroused and redirects their aggression towards a nearby person or animal because the actual source of their excitement can not be reached. This can be particularly dangerous, as the dog may not even realize that they are biting someone.

Fear or anxiety- Excitement can sometimes mask fear or anxiety in dogs. When a dog is feeling anxious or threatened, they may bite as a way to protect themselves or to try to escape from the situation.

Lack of socialization or training- Dogs that have not been properly socialized or trained may not understand how to behave appropriately when they are excited. They may bite out of frustration, playfulness, or because they simply don't know any better.

Medical conditions - Some medical conditions, such as pain or neurological disorders, can also lead to increased excitability and biting. If you notice that your dog is suddenly biting when excited, it is important to take them to the vet to rule out any potential health issues.

Genetics- Some dogs may be more prone to biting when excited due to their genetics or breed characteristics. Certain breeds, such as herding dogs and terriers, may have a higher tendency to nip or bite when they are excited.

It is important to understand why your dog is biting when excited and to address the underlying cause. This may involve behaviour modification training, socialization, desensitization, or medical treatment. If you are concerned about your dog's biting behaviour, it is always best to consult with a qualified trainer or animal behaviorist.