It’s very popular now for trainers to teach dog owners to ask their dogs to sit and then praise them by saying “Good sit.” But look at those words from a dog’s perspective. If “Sit” means “Put your butt down on the ground,” and you want your dog to do that every time you say it, what could your dog make of hearing “sit” after he’s already done so? I know your dog is smart, but expecting him to read your mind about when “sit” means “Do something” versus when it means “Don’t do anything; I’m referring to something that you’ve already done” is a bit much,