If there are only two chickens, it is better to keep them together unless the well one is pecking the injured one. When a small animal such as a chicken is injured, the main danger is from shock and infection, so try to get it somewhere which is relatively stress-free. Perhaps place them in a bathtub? If the chicken is warm, has nutritious food and plenty of water, the chances are very good that it will recover. A dab of antibiotic cream on the wound can't hurt, but the main thing is giving the bird what it needs to heal.

Whether the chicken lives or not, you'll want to harden the coop so that raccoons cannot get in, because they will try. If the chicken dies, it would be better to either get another chicken or give yours away, because chickens are social animals and don't do as well alone.

I am sorry to hear about your bird, but chickens can recover from some pretty gruesome-looking injuries. Good luck!

Take a box that is big enough for the chicken to turn around in and put some fabric in the bottom. This can be place anywhere but the bathroom is ideal as you can usually close the door. I usually just put a light piece of cloth over the top of the box so that air and a little light can get in.

As for food go get some baby food the first stage kind. Also pick up a good sized dropper. This will be your food for your bird. Mix some water with the food and try to gently feed your bird. Electrolytes would be good too.

I have had some success in stiching up wounds on my chickens and turkeys. The head injury will have to heal by itself. Keep using the antibiotic cream or better yet I use colloidial silver from a good health food store. You can also give this to the bird internally.

Good luck.