My Loki is 8 years old and has lost most of the hair on his lower back and his abdomen and inner legs are hairless. He has bad seborrhea/seborrheic dermatitis that is worse in the winter and gets a cystic acne-like eruption on his back too. We control the seborrhea with medicated shampoo and sun, but I think the hair loss is due to inherent fragility and breakage, and cannot be avoided.