Dog Owner's Home Veterinary Handbook.pdf - Mr. Walnuts

146 •DOG OWNER’S HOME VETERINARY HANDBOOK
develops, particularly in females. The coat and skin changes follow a symmetrical
pattern.
The cause of the hyperestrogenism should be determined by physical
examination, ultrasound, endocrine blood tests, and, if necessary, laparoscopy
or exploratory surgery.
Treatment: Hyperestrogenism in both sexes responds well to neutering.
GROWTH HORMONE–RESPONSIVE ALOPECIA
This is a rare cause of bilateral symmetrical hair loss. Growth hormone (somatotropin)
is secreted by the pituitary gland. In some cases, for unknown reasons,
the pituitary does not manufacture or release adequate concentrations of
growth hormone, resulting in coat and skin changes similar to those described
for hyerperestrogenism. Symptoms generally appear at puberty, but may occur
at any age.
This disease has been observed in Pomeranians, Chow Chows, Poodles,
Samoyeds, Keeshonds, and American Water Spaniels. It occurs predominantly
in male dogs.
Treatment: It is important to exclude other hormone-dependent causes of
hair loss. The treatment of choice for growth hormone–responsive alopecia is
neutering. If the coat does not improve, the dog may respond to growth hormone
administered subcutaneously three time a week for four to six weeks.
Dogs receiving growth hormone must be monitored for the development of
diabetes mellitus.
HYPOESTROGENISM (ESTROGEN DEFICIENCY)
This mild skin condition occurs in some older females who were spayed as puppies.
There is gradual loss of hair due to lack of new growth over the undersurface
of the belly and around the vulva. Later, it involves the lower chest and
neck. The skin becomes soft, smooth, and nearly hairless. Affected females
shed very little, do not collect much dirt, and make excellent house pets.
Treatment: This is not a serious disease and can be left untreated. If treatment
is desired, estrogen can be given under veterinary supervision. The hormone
must be given at least twice a week to affect hair growth.
Note that estrogens may cause bone marrow suppression in dogs. This can
be fatal if not recognized in time. Accordingly, all dogs receiving estrogen
must be monitored with frequent blood counts.
TRACTION ALOPECIA
Hair loss with baldness occurs in dogs who have had barrettes, rubber bands,
and other devices used to tie up their hair. When these accessories are applied