As you know Im probably one of the biggest advocates for animals on the boards as I am a Vet Technician and I own my own pit.. but to be honest you did the right thing. A dogs temperment is determined by plenty of things.. take for instance the golden retriever that just came into my office.. He was abused as a puppy and was not taken care of.. when he came into the vet.. it was obvious he was a bit wierd.. well yesterday he tried to bite one of the tech repeatedly in the face just for her bending down to his level.. a golden retriever.. those are the typical family dogs.. but as far as an aggressive dog.. if you warned the owner and he continually didnt care.. its his neglagence that killed his dog. I am going to be installing an invisable fence in my backyard.. and there are two little bichon's that continually come into my yard.. I have already warned them once that if they come into my yard... I am not responsable for what my dog does.. period..