Cooper, a ten year old male Pomeranian was slowly losing his hair. Frank said he looked mangy. Cooper had significant hair loss involving his sides, neck, and rear end. Testing revealed that Cooper had Alopecia X, a condition resulting from a hormone imbalance. Male pattern baldness in humans is related to altered levels of testosterone. In the dog, abnormal levels of progesterone are involved. We gave Cooper a monthly injection of progesterone and a lush new growth of hair resulted. Cooper now goes to the beauty salon every month.