Cushing’s disease in dogs—also known as hyperadrenocorticism—is a common hormonal disorder that mainly affects middle-aged to older dogs. It occurs when the body generates excessive levels of cortisol—a key stress hormone that helps regulate metabolism and supports the immune system.
Although it may seem concerning, identifying the condition early and following the right treatment plan can greatly enhance your dog’s comfort and overall well-being.
What Is Cushing’s Disease in Dogs?
Cushing’s disease develops when the adrenal glands release abnormally high levels of cortisol. This usually happens due to:
- Pituitary gland tumors (most common)
- Adrenal gland tumors
- Long-term steroid medication use (iatrogenic Cushing’s)
Cortisol is important in limited quantities, but persistently high levels can negatively affect multiple systems in the body.
Common Symptoms of Cushing’s Disease
The signs of Cushing’s disease often develop slowly, which makes them easy to mistake for normal aging.
Early Signs
- Increased thirst and excessive drinking
- Frequent urination
- Increased appetite
- Mild lethargy
Advanced Symptoms
- Pot-bellied appearance
- Hair thinning or hair loss
- Thin, fragile skin
- Panting and reduced activity
- Recurring skin infections
👉 Many dogs show a combination of these symptoms rather than all of them.
What Causes Cushing’s Disease?
There are three main types:
1. Pituitary-Dependent Cushing’s (Most Common)
A non-cancerous growth in the pituitary gland releases too much ACTH, leading to excessive stimulation of the adrenal glands.
2. Adrenal-Dependent Cushing’s
A tumor in the adrenal gland directly produces too much cortisol.
3. Iatrogenic Cushing’s
Caused by long-term use of corticosteroid medications like prednisone. This type is often reversible when medication is adjusted under veterinary guidance.
How Is Cushing’s Disease Diagnosed?
Diagnosis requires veterinary testing because symptoms overlap with those of other conditions.
Common diagnostic methods include:
- Blood and urine tests
- ACTH stimulation test
- Low-dose dexamethasone suppression test
- Ultrasound or imaging to detect tumors
Treatment Options for Cushing’s Disease
Cushing’s disease is usually managed rather than cured, but treatment can greatly improve your dog’s comfort and lifespan.
1. Medication (Most Common Treatment)
- Trilostane (Vetoryl) – reduces cortisol production.
- Mitotane (Lysodren) – destroys cortisol-producing cells.
- Selegiline (Anipryl) – used in specific cases.
👉 These medications require lifelong use and regular monitoring.
2. Surgery
- Removal of adrenal tumors (in some cases).
- It can be curative if the tumor is benign and fully removed.
3. Adjusting Steroid Medication
If caused by steroids:
- Gradual reduction or discontinuation under vet supervision.
- Symptoms often reverse after stopping the medication.
Managing Life with Cushing’s Disease
Dogs with Cushing’s can still live happy lives with proper care.
Ongoing Care Includes:
- Regular vet visits (every 3–6 months)
- Blood tests to monitor cortisol levels
- Adjusting medication dosage
- Feeding a balanced, often low-fat diet
Life Expectancy and Prognosis
- Most dogs live 1–5 years after diagnosis, depending on severity and treatment.
- With proper management, many dogs enjoy a good quality of life for years.
When Should You See a Vet?
Contact your veterinarian if you notice:
- Sudden increase in drinking or urination
- Unexplained weight gain or belly enlargement
- Hair loss or skin issues
- Persistent fatigue
👉 Detecting the condition early greatly improves the chances of effective treatment and better outcomes.
Final Thoughts
Cushing’s disease in dogs may sound overwhelming, but it is a manageable condition with modern veterinary care. The key is recognizing the symptoms early, getting a proper diagnosis, and following a consistent treatment plan.
When managed well and given the right care, your dog can continue to live an active, comfortable, and rewarding life.
