Have a crippled boer buck. I am kind of new to the business and I can't tell what is wrong with him. His hooves are fine, but his front legs he keeps stiff when he walks. He has lost a lot of weight. Please, does anyone know what is wrong with him. If the problem is incurable how much should I try to sell him for? He is registered 94% solid red with white spots on belly. All help is appreciated!!! Thanks!!