firstly, it's not the other dog's fault that your dog attacked it. it's the owner's fault for not training it to recall. have you had this JRT from a pup? From now on, muzzle him every time you go out to prevent any more attacks as it's not fair on the other dogs.

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Mummy to 7 pets: 2 rabbits, 3 rats, 1 dog, 1 cat