It varies from dog to dog though just how much of a lever it is, or how necessary it is. e.g. our border collies will do things for you just because it's inter

It varies from dog to dog though just how much of a lever it is, or how necessary it is. e.g. our border collies will do things for you just because it's interesting to them or because they figure it might please you. Without treats. Look at a collie herd sheep or ducks, and they're totally blissing out on it, and they don't get food rewards after. It's just something they love to do. There's other dogs who won't do anything unless they get a tasty treat out of it.