We know you have seen your dog sleeping on his back with the four legs up, so that position has the name of crazy legs. Researchers say that dogs who sleep in this position tend to be submisive and feell vulnerable. With his for legs up, his stomach is completly exposed. If your dogs sleep in this way it means that they are very independent and laidback. Whatever the case, when a dog is doing the Crazy Legs, they are letting their family know that they feel 100% comfortable and safe.