60 BASICS
SPECIFIC LOCATION ALOPECIA
Traction alopecia: associated with hairclips or rubber bands, dorsum of head (Fig-
ure 6.10).
Postclipping alopecia: failure to regrow hair after clipping (often in Nordic breeds).
Melanoderma/alopecia of Yorkshire terriers: alopecia and hyperpigmentation of pin-
nae, bridge of nose, sometimes tail and feet, puppies and young adults.
Canine flank alopecia: localized cyclic serpiginous, follicular dysplasia on the flank
associated with hyperpigmentation and comedones (Figure 6.11).
Black hair follicular dysplasia: black hair only (Figure 6.12).
Dermatomyositis: symmetric alopecia on the face, tip of tail, digits, carpi, tarsi, and
pinnae; often associated with erythema and scarring; primarily in shelties and collies
(Figure 6.13).Pinnal alopecia: miniaturization of hair, periodic or progressive, common in Siamese
cats and dachshunds.
Pattern baldness in dogs: Portuguese water dogs, American water spaniels, grey-
hounds, whippets, Boston terriers, Manchester terriers, Chihuahuas, Italian grey-
hounds, miniature pinscher (Figures 6.14, 6.15).Tail gland (supracaudal gland) alopecia: a patch of noninflamed alopecia located
approximately 2 inches from the base of the tail along the dorsal surface (Figure 6.16).
GENERALIZED/DIFFUSE ALOPECIA
Demodicosis: severe cases (Figure 6.17).
Dermatophytosis: severe, chronic cases (Figure 6.18).
Sebaceous adenitis: associated with phrynoderma (keratin casts), diffuse scaling, dor-
sum is always more affected than ventrum, dorsum of head involved (Figure 6.19).
Cushing’s syndrome (typical and atypical): truncal alopecia, comedones, rat tail,
atrophic skin, phlebectasia, potbelly, pyoderma, hyperpigmentation (dog and cat);
curling of tips of pinnae and skin fragility are characteristic in the cat (Figures 6.20–
6.22).Hypopituitarism: failure to grow primary hair coat (Figure 6.23).
Alopecia X: adrenal hyperplasia-like syndrome, symmetric truncal alopecia (Fig-
ure 6.24).
Hypothyroidism: “tragic face”/myxedema in the dog, bilateral and symmetrical trun-
cal and cervical alopecia (Figures 6.25, 6.26).
Hyperthyroidism: cat, unkempt hair coat with partial alopecia, barbering along fore-
limbs, may mimic OCD (Figures 6.27, 6.28).
Hyperestrogenism: rare symmetric alopecia of perineum, inguinal, flank regions;
mammary glands and vulvar hyperplasia, cystic ovaries.
Estrous related: intact female dogs, perineal and flank alopecia that may progress to
generalized, cyclic.