As an aside ... re: breeding for temperament.
A friend of mine works in AI/ET programs for beef cattle. He was telling me about a call he received one time from a lady in Australia who wanted to import some semen and embryos. He asked her about what she were her most important traits that she was looking for in cattle, and, after some lengthy discussions on a variety of related items, she finally settled with, "temperament, temperament and temperament".
On point with dogs, if you have a poorly behaved specimen, you're not going to have any fun at all with your pooch as a pet. Maybe (s)he'll win in the ring or at the working-dog course (pulling, etc.), but if it has a poor demeanor, no body is having any fun ... and having / breeding dogs is a hobby, and hobbies are supposed to be fun. If it's not, you're not doing it right.