I have a 4-year-old rooster who was attacked by another rooster and has a bum leg now for 4 weeks. I don't see any injury; his right leg is dead but warm. He cannot walk, but eats and drinks. The other day he started to crow again. What should I do? I've been thinking I should put him down but feel sad about it. I bought him as a chicky and he is beautiful. Please advise. Thanks.