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 using hair ties loosely and for short periods—or preferably, not using them at all.