I don't know if I entirely agree with the statement of "no such thing as bad dogs, only bad owners". I have a friend, and she bought a rottie from a breeder who "guaranteed" that he would be friendly etc. My friend did her research, checked references, put a deposit down, and waited over a year for her rottie. When she finally got him, she immediately took him to doggie training, and socialized him. She would spend ALL DAY with him...completely 100% committed. They had some agsression issues with him, so they got him a personal trainer, and phoned the breeder, who was no help. She did more classes, more personal trainers...she spent literally THOUSANDS of dollars. When people came over, she put her dog in a seperate area, because he would nip. One day he nipped at a woman visiting. My friend had told this woman NOT to pet her dog, but she did anyways, and her dog nipped at her hand. My friend was so distraught. She called me and was crying for HOURS about it. She spent more money on training etc. But, then he nipped someone else...and she reported it. So, my friend phoned the breeder, and returned the dog...without a refund. Is she a bad owner? I can't say that she was...with all the money and effort she put into her dog, there is NO WAY she was a bad owner. Was the dog bad? Well, he bit...I don't know...is that bad? It's a bad situation. The dog lost his owner, and my friend is still distraught today, and vows she will never have another dog because her heart was broken so badly.