Why does my dog bite his own tail and now he's got a wound on it?

United States
@ratty79 (284)
December 23, 2006 7:49pm CST
I don't know whats wrong with him but he's also losing alot of weight? He use to eat his dog food all the time but now he hardly eats anything except a really good steak or something. I'm worried about him and I can't take him to the vet because I dont have any insurance for him. Should I give him some vicodin or something