Cushing’s disease

Cushing’s disease occurs primarily in senior dogs. It may also occur in ferrets. Signs that
owners may notice in a pet with Cushing’s disease include increased urination, excessive thirst,
voracious appetite, weight gain, thin hair coat, pot-bellied appearance, chronic infections, panting,
and lack of energy.
The symptoms observed in animals suffering from Cushing’s disease stem from an increased
secretion of the body’s stress hormone, cortisone. Cortisone is released from the adrenal glands,
glands that overlay the kidneys in the abdomen. In 15% of dogs with Cushing’s disease, there
exists a tumor in one or both of the adrenal glands. The tumor cells produce an excessive amount
of cortisone, resulting in symptoms. In 85% of dogs with Cushing’s disease, a benign tumor in
the pituitary gland at the base of the brain is the cause. The pituitary gland, the ‘master gland’,
also regulates the function of other endocrine glands in the body.
The first steps in diagnosing Cushing’s disease are obtaining a good history and a thorough
physical exam. The veterinarian will recommend comprehensive blood work and a urinalysis to
help eliminate the possibility of other metabolic diseases such as diabetes, kidney failure, and
inadequate thyroid gland function. Next, the veterinarian may recommend a blood test called an
ACTH stimulation test, or LDDS (Low Dose Dexamethasone Suppression) test. These two tests
are hormone tests that challenge the adrenal gland. An over-productive adrenal gland responds
quite differently than a normal adrenal gland in the face of ACTH or dexamethasone injections.
If a pet tests positive for Cushing’s disease, the next step is to determine whether it is an
adrenal gland tumor or a pituitary gland tumor. An abdominal ultrasound performed by a board
certified veterinary radiologist may be scheduled. If no discreet tumor is located in either adrenal
gland, it is assumed by default that the pet has a pituitary gland tumor.
The treatment options regarding Cushing’s disease are numerous. In pets with adrenal gland
tumors, surgical removal is the preferred method of treatment. However, if a pet owner is fearful
of the complications and risks involved with surgical intervention, medical therapy is an option. In
dogs with pituitary tumors, surgery is not a treatment.
There are several choices for medically managing Cushing’s disease. The option with the
most positive, long-term results is the use of a drug called Lysodren. Lysodren is a medication
that destroys adrenal gland tissue. Side effects associated with the use of Lysodren include
weakness, loss of appetite, vomiting and/or diarrhea, and/or a loss of balance. The drug is initially
given twice daily with meals. When the dog’s appetite begins to wane, the twice a day therapy is
discontinued. This usually takes between 5-7 days. Seven to ten days after the onset of therapy,
an ACTH stimulation test is performed to see if the therapy was effective. The dog is then put on
a twice weekly maintenance dose of Lysodren. An ACTH stimulation test is performed one
month later, and then every three months for the life of the dog.
A second option for medical management of Cushing’s disease is the use of a drug called
Anipryl. Anipryl is only recommended for dogs with pituitary dependent Cushing’s disease, not for
adrenal gland tumors. Anipryl is recommended for Cushing’s disease cases that are
uncomplicated by other metabolic diseases, such as diabetes, liver disease, etc. Anipryl is safe
and carries few side effects. It is given in tablet form once daily. It is helpful in alleviating the
symptoms of Cushing’s disease 20-30% of the time, but it is NOT a cure.
A third option for treating Cushing’s disease is the use of a drug called ketoconazole. Side
effects include loss of appetite, vomiting/diarrhea, and liver disease. Ketoconazole is given orally
twice daily. After seven to ten days, an ACTH stimulation test is recommended to make sure that
adrenal gland function is normal. If the adrenal gland function is normal, a maintenance dose of
ketoconazole can be calculated.
Most pets with Cushing’s disease should be put on a diet that is low in fat and/or protein, and
easy to digest. These animals are generally obese and have secondary liver problems. Consult
with your veterinarian for recommendations regarding your particular dog’s dietary needs.
Monitoring of patients with Cushing’s disease varies widely, depending upon the course of
therapy followed. For surgical patients the immediate postoperative period may require
hospitalization and frequent recheck appointments, as well as a two-week postoperative ACTH
stimulation test. For patients undergoing Lysodren therapy, an exam and ACTH stimulation test is
recommended prior to beginning the therapy, and at one week, one month, and every three
months thereafter. For Anipryl therapy, recheck exams and evaluations are recommended after
one month, and every three months thereafter. For ketoconazole therapy, an exam, chemistry
profile, and ACTH stimulation test is recommended at one week, one month and every three
months thereafter.
The costs for an examination, comprehensive blood work and urinalysis run about $300. The
cost of an ACTH stimulation or LDDS test is approximately $200. The cost of an abdominal
ultrasound is about $350. The cost of surgical removal of an adrenal gland tumor varies,
depending upon the size of the tumor and whether or not the tumor invades surrounding tissues.
An owner could expect a range of between $2,500-5,000. The cost of a 3-month supply of
Lysodren for a 25 lb. dog is around $70.00. The cost of Anipryl for a 25 lb. dog for one month is
$65.00. The cost for a 3-month supply of ketoconazole for a 25 lb. dog is $25-45, depending upon
the necessary maintenance dose. In summary, for the first year of diagnosis, treatment, and
monitoring of a dog with Cushing’s disease, using the Lysodren therapy protocol, a pet owner can
expect an expense of $2,200-2,500. For the first year of Cushing’s disease therapy using Anipryl,
the expected expense is $1,750-2,000.
Please speak with your veterinarian if you have questions regarding Cushing’s disease in your


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