[QUOTE=threedogpack;6163847]
you don’t believe genetics is a factor?[/QUOTE]
I believe genetics is a huge factor. What I don’t believe is that “good breeders” are the source of genetics for good pets. They’re selecting for angle of hock, desire to herd, length of coat, etc. I’m sure the very best, most concientious breeders place a premium on temperament. But most don’t. And even if they do, have you looked at the standards? Each one has an “out” for its breed’s weaknesses as a companion animal - the little ones are allowed to be “one-person” aka shy, the big ones are allowed to be “protective” aka aggressive, etc.
Unwanted dogs aren’t genetic cesspools with massive problems. Most are just normal-range dogs who ended up in a bad place. At the risk of starting WWIII, I would except the “fighting” breeds because they really do have a massive genetic issue in dog-aggression and most of them are being produced by people who value that trait. There is some chance, when you choose (for instance) a small fuzzy dog at a shelter, that it originated in a puppy mill under circumstances which made it genetically shy and fearful. There is virtually 100% certainty, when you choose a pit bull at a shelter, that the dog originated in a breeding deliberately designed to produce a dog genetically geared toward hyper-aggression toward other dogs.