It could mean a variety of things, from a bug bite to parasites to infection to auto-immune disease to cancer.
I would start with a trip to the veterinarian for an examination - local inflammation is pretty easy for a veterinarian to spot, as are fleas, ticks and mites. All of these can be resolved in a few weeks with the appropriate medication.
If it appears the problem is an underlying nerve irritation issue, or is trauma, this may take more work to sort out and get under control.
tail,fur
Possible infection or canine cushings disease, here is a help site link http://www.vetinfo.com/dencyclopedia/deindex.html
i would take him/her to the vet
A SNOW LEOPARD and a DOG
Boxer
I used Epi-Smoothe on my dog. She has some spots where her fur is falling out
Whiskers, fur, paws and a tail. 4 legs, no arms :-)
To prevent a dying dog's fur from fading or losing its color, it is important to use a gentle shampoo specifically formulated for colored fur, avoid excessive sun exposure, and provide a balanced diet rich in nutrients. Regular grooming and using a leave-in conditioner can also help maintain the vibrancy of the fur.
its only to much for a dog to shed only if it is losing all its fur then contact or drive to the vet immediately
http://www.boxerforums.com/losing-patches-of-fur-t19467.html
Probably one with fur, a tail and, most likely four legs? I don't know if you do not specify
Could be mange, a potentially dangerous condition, but easily treated by a vet.