I have a 10 year old chessie. Last year he developed hard mouth and my ducks are coming back to me with crushed bones. I have heard of wrapping his training bumpers with barbed wire so he has to hold them gingerly. Has this worked for anyone? Is there a better way to cure hard mouth. Honestly, he is slowing down and may not be hunting too much longer, but I would still enjoy being out with him. It would kill him to have him along and not get to retireve. Please lend advice.