Why are my dogs fighting when one visits? How to stop dog aggression?

Question

My aunt went out of town for a week and put her dog in my house, and they started fighting, initially its play fight then my dog starts to attack my aunt’s dog like really really bite him. but they are literally brother and sisters from the same mother, the last time my aunt’s dog came over to stay for a few days, she didnt attack like this. how to stop this and why is this happening? Pet's info: Dog | Shih Tzu | Female | unspayed | 5 months and 15 days old | 9 lbs

Andrea M. Brodie, DVM · Accepted Answer

The only way to stop this is to separate the dogs and not let them "play" together. Your aunt's dog is invading the territory of your dog, which your dog obviously does not appreciate. If your aunt's dog suffered bite wounds you may have to take him to a vet. This fighting is probably happening now because your aunt's dog had the "puppy advantage" when he was at your house the last time, but now he is starting to grow up and your dog will not give him the puppy advantage any more, so feels threatened in her rule of her territory. This is assuming your aunt's dog is the same age or younger than your dog.

Why are my dogs fighting when one visits? How to stop dog aggression?

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