I read that in a dog training book a long time ago, and tried it with Willow. Didn't do any good at all. Probably made things worse. Anyway she never got used to the crate and I gave up on it. I wonder how often it actually does work?The dog would start whinning in the crate and I would immediatly slam my hand down on the top of the crate. If you keep the kennel in close proximity and they don't see you they have no idea it's you and they wont associate the scary noise with you. All my dogs were trained to keep quite in the crate this way. all my dogs still love the crate and it only took two to three days for them to be quite.