Baldness and Hormone-Related Skin Disorders in Dogs
Hormone Responsive Dermatosis and Alopecia in Dogs
Alopecia and dermatosis are skin and hair disorders related to an imbalance of reproductive hormones. More specifically, alopecia is characterized by a loss of hair leading to baldness, and dermatosis is characterized by a diseased condition of the skin. There are a lot of reasons for why a dog would have these types of reactions, but if all indications point to an imbalance in hormones related to reproductive functioning, your veterinarian will try supplemental therapy to either lower or raise hormone levels to a normal amount. Identification of hormone related alopecia and/or dermatosis is assured when the conditions spontaneously resolve after the use of reproductive hormone therapy.
Symptoms and Types
Affected animals are categorized, and treated, according to the measurable amount of reproductive hormones being produced in the body:
Estrogen-responsive - ovarian imbalance II in females - rare
Too much estrogen - ovarian imbalance I in females - rare
Too much estrogen – in intact male dogs with testicular tumors
Too much androgen (male reproductive hormone) - associated with testicular tumors in intact, non-neutered males
Testosterone-responsive – in older, castrated males - rare
Castration-responsive - intact males with normal, descended testicles
Adrenal reproductive hormone imbalance - adrenal hyperplasia–like syndrome (enlargement of tissue)
You will need to give a thorough history of your dog's health, including a background history of symptoms, and possible incidents that might have preceded this condition. Your veterinarian will then perform a thorough physical exam on your dog, including a biochemical profile, a complete blood count, a urinalysis, and an electrolyte panel. Serum sex hormone tests will often return as normal in affected dogs. A skin biopsy can illustrate abnormal sex hormone receptors in the skin.
X-ray, ultrasonography, and laparoscopy (using a small camera to examine the interior of the abdomen) imaging can be used for detection of ovarian abnormalities, testicular disorders and cancer.
An adrenocorticotropin hormone (ACTH) stimulation test, and an adrenal reproductive hormone test may be performed to measure the functional capability of the adrenal gland, and to be sure that it is specifically producing reproductive hormones. And a Gonadotropin-releasing hormone (GnRH) response test can demonstrate the response of the cells in the testes and ovaries to gonadotropin hormones. Specifically, the hormones that produce testosterone, primarily.
If your dog is suffering from abnormal reproductive hormone levels, neutering or spaying will be one of the primary treatments. This alone may be enough to resolve the skin disorders. If your dog is on estrogen therapy, and the results are adverse to the health of your dog, your veterinarian will discontinue it. Your veterinarian will prescribe prescription shampoo for dandruff, and topical medicines for the treatment or prevention of bacterial skin infections and itching.
Living and Management
It is highly advised that all dogs suspected of suffering from sex hormone related skin disorders should be spayed or neutered, but in any case, you should not breed your male dog if it is affected with cryptorchidism (undescended testicles). Your veterinarian will schedule follow-up appointments as necessary for further treatment of any underlying sex-hormone related causes of the skin disease.
A hormone that is created at the time of pregnancy
The fold of skin over the top of the penis
Something around the anus
The gland around the urethra that secretes the fluid to allow sperm to move about
The sac that holds the testes; may also be referred to as the scrotal sac
The genitalia of a female; found on the outside
An in-depth examination of the properties of urine; used to determine the presence or absence of illness
The glands in female animals that are used to produce milk; also called the udder or breast
Denotes an animal that is still able to reproduce or is free of cuts and scrapes
The process of removing tissue to examine it, usually for medical reasons.
The end of the gastrointestinal tract; the opening at the end of the tract.
A condition of the skin
A substance that causes chemical change to another
A hormone that gives stimulation to the gonads
The type of female hormone produced in the ovaries that contributes to sex drive and female characteristics
The gland that produces the hormone adrenaline and others; helps to regulate the metabolism, electrolytes, and even sexual function; also helps to regulate the way the body responds to injury, trauma, etc. The adrenal gland is found near the kidney. Also referred to as the suprarenal gland.
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