ABSTRACT
Non-pruritic alopecias can be divided into focal/multi-focal alopecia or symmetrical/diffuse alopecia. As alopecia X is purely cosmetic and the health of affected dogs is not impaired, monitoring without treatment is a reasonable treatment option. Cyclical flank alopecia is a follicular dysplasia of dogs resulting in alopecia and hyperpigmentation in the flank regions. Telogen and anagen defluxion are conditions of diffuse alopecia that occur because of a disruption in the normal hair cycle. Hypothyroidism is a clinical syndrome associated with a failure of the thyroid glands to produce and release thyroid hormones. Some dogs experience a massive shedding of hair and skin cells 1–2 months after initiation of thyroid supplementation. Hyperadrenocorticism is rare in cats, although iatrogenic and spontaneous cases with a similar proportion of pituitary dependent and adrenal tumours to dogs are seen. Feline paraneoplastic alopecia is a non-pruritic syndrome of hair loss that is a marker for underlying internal malignancy.
