Canine pinnal alopecia

From Dog
Characteristic appearance of canine pinnal alopecia[1]

Canine pinnal alopecia is a skin disease of dogs characterized by progressive hair loss from the ears.

A breed predisposition has been reported in a number of breeds including the Dachshund, Boston Terrier, Whippet, Italian Greyhound and Chihuahua.

The alopecia is characteristic and develops within the first year of life. The hair loss may become more progressive but usually does not extend to the rest of the body.

Small villous hairs may be seen in the alopecic areas. The alopecia may also be accompanied by vasculitis eventually leading to ulceration or fissures at the ear margin.

A differential diagnosis would include psoriasiform-lichenoid dermatosis‎, color dilution alopecia, hypotrichosis, sebaceous adenitis[2], Malassezia spp yeast infections, Demodex spp, ringworm and various ischemic dermatopathies such as dermatomyositis[3].

There is no specific treatment required for this condition.

References

  1. DVM360
  2. Zur G & Botero-Anug AM (2011) Severe ulcerative and granulomatous pinnal lesions with granulomatous sebaceous adenitis in unrelated vizslas. J Am Anim Hosp Assoc 47(6):455-460
  3. Morris DO (2013) Ischemic dermatopathies. Vet Clin North Am Small Anim Pract 43(1):99-111