Generalized hair loss is a problem
associated with the loss of the entire
coat and is one of the main causes of
veterinary visits to animals. In most
cases, it is an acquired condition,
although there are also congenital
forms of hair loss, caused by
abnormal development of hair
follicles. This article discusses both
types of causes of hair loss in dogs.
Congenital hair loss can occur in the
first weeks of puppies' life, but it does
not progress with age. Although not
always, most often congenital hair
loss has a genetic basis. Dysplasia
with bleaching of hair color and
follicular dysplasia of black hair are
examples of congenital skin
neuroectodermal disorders. Acquired
hair loss is usually caused by
hypothyroidism, hyperadrenocorticism
and hyperestrogenism, and occurs in
dogs at a later age associated with
hormonal disorders.