the word AT... exagerated.. like AHHT! NO.. and go on about what your doing.. repeat as neccessary.. to many times clap your hands at the same time and point then say Bad DOG! (this usually makes the pet seem like you dont want him near; so I dont use bad dog unless they are REALLY bad; biting on the kids at that young age them teeth are sharp, and the bathroom trash.. only time I use bad dog) Good Dog Bad dog does have a cognitive affect on the dogs .. Good Dog means do what you want until they get it.. If your dog sits and listens Good dog generally makes the dog want to come get more praise.. LOL Dont use it as much as you use GOOD dog body language.. Just as Im instructing to use Bad dog body language... Does that makes sense? Im sure other things work for other people, this is what works for me..