Small Animal Dermatology, 3rd edition

674 DISEASES/DISORDERS

Sebaceous epitheliomas: Irish setter, malamute, shih tzu

Sebaceous adenocarcinomas: rare; cocker spaniel, cavalier King Charles spaniel,

Scottish terrier, husky.

 Hair follicle tumors:
Trichoepithelioma: cats – Persian; dogs – basset hound, golden retriever, German

shepherd, miniature schnauzer, standard poodle, spaniel

Pilomatrixoma: Kerry blue terrier, poodle, Old English sheepdog

Trichoblastoma: poodle, cocker spaniel

Tricholemmoma: Afghan

Trichofolliculoma: none

Dilated pore of Winer: older cats, no breed predisposition.

Mean Age and Range

 Squamous cell carcinoma:
Cats 9–12.4 years
Dogs 9 years.

 Melanocytic tumors:
Cats 8–14 years (rare)
Dogs average age 9 years (common).

 Basal cell tumors:
Older cats predisposed
Uncommon in dogs.

 Sebaceous gland tumors:
Uncommon in older cats; 10–13 years
Common in older dogs; 8–11 years
Adenocarcinomas – rare in both dogs and cats.

 Hair follicle tumors:
5–13 years of age; dogs and cats.

Historical Findings

 Squamous cell carcinoma:
Most common cutaneous malignant neoplasm in cats (15–49%); second most

common in dogs (3–20%)

Feline SCC more prevalent in sunny climates and high altitudes (high ultraviolet

light exposure)

Crusts, ulcer, or mass present for months and unresponsive to conservative treat-

ment

Bowen’s disease (cats): skin becomes pigmented; ulcer/crust may develop with

or without progressive pigmented hyperkeratosis

Lips, nose, eyelids, and pinnae: may start as shallow crusting lesion that pro-

gresses to a deep ulcer

Facial skin involvement (cats)

Claw fold involvement (dogs)