At one point, my doggy attempted to be dominant over us, but that's straightend out now, he understands when it comes to us, he's not in charge. I used to attend dog training classes with him, he wasn't aggressive then. One day, I was using Bonzai as a demonstration dog at a puppy class and a little puppy jumped in his face (he was trying to play) and my aussie snapped at him and that was the first time I saw him act like that with other dogs. He used to be very, very bad about it. If he even saw a dog close to him being rewarded with food he'd try to snap at him. But is has improved alittle. My dog trainer suggested the same thing to me about the food thing. I thought the same thing, but maybe it would actually work. I dunno, just thought I'd get people's opinions about this issue.