So far (knock on wood) Angel hasn't seemed to have problems with any other breed at all. We been to the home of a friend with a Pitt Bull & Australian Shepherd, no problems. We've been at my mother's many times and she has a 14 yr. old "puppy", who is the daughter of pur Blck Lab, Sheba. She's had all 3 in our home with no problems as well as a friend's Turv (?) named Bear. Perhaps it's because she has so much socialization 5 days a week at doggie day care? She plays with everything from a Papalion to a lab mix pup.
The ONLY aggression she's shown so far was when a male friend she'd never met came to the house and followed me into my computer room. He's rather tall (about 6'5") and it was her first time meeting him. When we walked into the computer room, she came tearing in and politely positioned herself between the two of us. No growling, no sign of outward aggression, just stood there to make sure he was no threat.
It was rather interesting to see her become so defensive of "mom" since she has shown no aggression of any type since she's been a part of the family.
Cat & Angel