My yellow lab is a duck hunting machine but he has one flaw, he breaks under the gun. I trained him since he was a puppy and was a member of the Retriever club. He has been in many hunt tests and never broke. Get him in a blind and look out! I start shooting and he is off like a prom dress..To be clear he is going after a downed bird and I realize there is worse problems to have. How do I cure him of breaking but not take away his desire?