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Is he scratching it out or is it falling out?

Is the hair falling out from infection or demodicosis?

Are the hair follicles no longer cycling?

What conditions are associated with the hair cycle abnormalities?

What is Alopecia X?

How is Alopecia X diagnosed?

How do we treat Alopecia X?

What do we know about the hair cycle in dogs?

Dr. Linda A. Frank
Department of Small Animal Clinical Sciences
College of Veterinary Medicine
The University of Tennessee
Knoxville, TN 37996-4544
Tel: (865) 974-8387 (ET) Email:



What conditions are associated with hair cycle abnormalities?


Many diseases and conditions are associated with hair cycle abnormalities. These include endocrine diseases such as hypothyroidism


and Cushings Syndrome,


hair cycle arrest (Alopecia X),


cyclic flank alopecia,

pattern baldness,


post-clipping alopecia,


and telogen defluxion.

It is very important to make sure your dog does not have one of the endocrine diseases since these conditions affect more than just skin and hair. Your veterinarian can run special tests to diagnose hypothyroidism or Cushings Syndrome.


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