I have used Educator collars for three dogs. The first, a Dalmatian rescue who had been in a crate for 14 hours a day prior to adoption, simply could not be trained to return. She would escape and we would chase her, sometimes for miles. Can you blame her? I heard about the Educator e-collar and had her trained by an excellent trainer who trains dogs for the state police in my state. This level of a trainer is not necessarily needed, however. In any case, that was five years ago. She is extremely well behaved, all I have to do is show her that I have the remote in my hand…….fantastic product and online support.