As a pet owner this changes for me depending on the breed or type of dog. We have as staffy that we picked for his soft temperament. We wanted his breeds dependability with people, but didn't want dog aggression. He is very good with dogs, very gentle with the kids etc. he has been great :) We trained and socialised him with that in mind. We did research his breeds history, and are aware gameness is an important part of his make up, he does enjoy chasing a ball and diving under stuff :)
Our toy breeds are companion dogs and we encourage that because it makes for nice inside dogs :)