I tried to do some searching but all I found is that you would take him to the vet to make sure the tail doesn't get an infection. If you can't, then perhaps you can banage it up and try to make sure it doesn't drag in dirty places so bacteria doesn't get on it. Sorry I can't help much. This is the best I could find:
http://answers.yahoo.com/question/index?qid=20081018153606AAdpXDv