Hi, My 5 year old neutered terrier is a very sociable dog. And until now he has always played well with other dogs. I am trying to socialise him with my brothers puppy, however my brothers pup is unneutred and keeps trying to mount him. My dog has gave a few warning snarls but this did not deter the pup. (Who is an alsatian and bigger). So now my dog got fed up and goes for him agressivley every time my brothers dog goes near him, and my brothers dog just wont leave him alone. Will the other dog eventually leave my dog and they will get on or is this going to be the 1 dog my dog will not tolerate.