I'm going to be moving in with my grandmother at the end of September. I'm bringing my GSD (Virgil), who will then be 1.5 years old, with me. My grandmother has a jack russell x chihuahua (Bobby). Every time we go to visit her Bobby spends all of his time that he's in the same room as Virgil growling at him, and goes for him if he gets too close. Virgil just ignores him. I've taken them out for a walk together and they seemed to get along absolutely fine, no growling or anything. So I'm guessing Bobby is being defensive of his territory when we're in the house. Does anyone have any advice on how to overcome this? Thanks ?