That business about a dog that thinks he's a chicken or a sheep is because of when he's introduced to the flock. At seven weeks the dog forms attachments and identity. A dog that stays with the litter longer than that is almost unmanageable. He's a dog that only identifies with dogs. In my experience with hunting dogs, if you take the dog out of the litter at exactly seven weeks he knows he's a dog but imprints on people.
