I have a roo that has been crippled sinced around the time he feathered out. He's been doing very well, until this past week when we were gone on vacation. I had someone staying at our place caring for the animals, and one morning he noticed that this roo had most of his comb torn off. None of the other chickens in the pen had any injuries, so I don't know if it could have been a predator. It seems too severe to have been done by another chicken. The part of his comb that is torn off is still complete, but most of it is black----probably gangrene. I want to remove the dead part, but am unsure of the proper way to do this. Should I just take a big pair of shears and cut it off? Will there be much bleeding? Anyone have to deal with something like this before?