My 13 week old CLM is starting to avoid going into his kennel after play times, evening walks, etc. When he senses that his time of roaming outside of the pen is about to come to an end, he will trot off about 30 feet from the kennel and lay down with his chin on the ground (pouting). When you walk up to him, he will roll over and want you to scratch his belly. If I don't have him on a lead at the moment, I've been just holding onto his collar and walking him to the kennel as I repeat the command. I've told my wife and son to never rub his belly or give him any positive reinforcement when he does this (not sure if my wife is following orders or not . Is there anything else I should be doing, or is this just a phase of testing his boundaries that will pass eventually?