This is what is says in my Home Veterinary Handbook:
GROWTH HORMONE-RESPONSIVE ALOPECIA
This is a rare cause of bilateral symmetric hair loss. Growth hormone (somatotropin) is secreted by the pituitary gland. In some cases, for unknown reasons, the pituitary does not manufacture or release adequate concentrations of growth hormone, resulting in coat and skin changes similar to those described for hyerperestrogenism. Symptoms generally appear at puberty, but may occur at any age. This disease has been observed in Pomeranians, Chow Chows, Poodles, Samoyeds, Keeshonds and American Water Spaniels.
TREATMENT: It is important to exclude other hormone-dependent causes of hair loss. The treatment of choice for growth hormone-responsive alopecia is neutering. If the coat does not improve, the dog may respond to growth hormone administered subcutaneously three times a week for four to six weeks. Dogs receiving growth hormone must be monitored for the development of diabetes mellitus.
TRACTION ALOPECIA
Hair loss with baldness occurs in dogs who have had barrettes, rubber bands and other devices used to tie up their hair. When these accessories are applied too tightly or for too long a time, traction on the hair effects the hair follicles, causing the roots to stop growing. This results in an area of hair loss that may be permanent.
TREATMENT: The only treatment for a permanent bald spot is to remove it surgically. This would only be done for cosmetic reasons. Alopecia can be prevented by applying traction devices loosely and for short periods, or preferably by not using them at all. |