I have a 2 yr old Italian mastiff mix, who's tail tip is completely bald. He has bad case of happy tail wag, you know dogs wag their tail so hard it hits corners or walls and breaks the skin and bleeds everywhere... I got the tail to heal but I'm not sure about the hair and im not going to dock my dogs tail unless it's necessary, where I live, vets do docking for older dogs very rarely. I need to know if there is anything I can do to help him grow the hair back...