Cushing's Disease In Dogs
Understanding Cushing's Disease
Hearing that your dog may have Cushing’s disease (hyperadrenocorticism) can feel overwhelming. Cushing’s disease occurs when the body produces too much cortisol – a hormone that normally helps regulate stress, metabolism, immune function, and blood pressure.
When cortisol levels stay elevated over time, it can affect many parts of the body and lead to the gradual changes many pet parents notice at home.
The good news is that with the right diagnosis and management plan, many dogs with Cushing’s disease live comfortable, happy lives for years.
What Causes Cushing's Disease?
Cushing’s disease develops when the system that controls cortisol production stops working properly. There are two types:
Pituitary-Dependent Cushing's
(Most Common)
About 85% of dogs have a small, usually benign tumor in the pituitary gland in the brain. This causes the adrenal glands to produce excess cortisol even when the body doesn’t need it.
This form is typically managed with medication.
Adrenal-Dependent Cushing's
Less commonly, a tumor forms in one adrenal gland and produces cortisol on its own. Some adrenal tumors are benign and some are malignant, but both can cause significant illness due to hormone overproduction.
Your veterinarian determines the most appropriate treatment based on your dog’s specific condition and overall health.
Conditions Commonly Associated with Cushing's Disease
Because cortisol affects many systems in the body, dogs with Cushing’s disease can sometimes develop other health problems over time. In some cases, these related conditions are actually the first sign that an underlying hormone imbalance may be present.
Common conditions seen alongside Cushing’s disease include:
- Pancreatitis: Changes in metabolism and immune function can increase the risk of inflammation in the pancreas, especially in dogs with elevated fat levels in the blood.
- Gallbladder disease: Hormone changes can affect how bile moves and is stored, which may lead to gallbladder dysfunction or the formation of gallbladder mucoceles.
- Liver changes: Long-term cortisol excess often causes liver enlargement and elevated liver enzymes, and may contribute to ongoing liver disease.
- Urinary tract infections: Cushing’s disease can weaken normal immune defenses, allowing infections to develop without obvious symptoms.
Understanding these connections helps us look beyond individual symptoms and evaluate your dog’s health as a whole, allowing earlier diagnosis and more effective treatment planning.
Signs You May Notice At Home
Cushing’s disease often develops slowly, sometimes over months or years. Common signs include:
- Increased thirst and urination
- Increased appetite
- Panting, even at rest
- Hair thinning or slow hair regrowth
- Recurrent skin problems
- A “pot-bellied” appearance
- Muscle weakness or reduced stamina
Because these changes happen gradually, many families assume they are simply signs of aging.
Problems You Can't See
Even when dogs seem comfortable, excess cortisol can cause internal changes such as:
- High blood pressure
- Elevated cholesterol
- Silent urinary tract infections
- Increased risk of blood clots
- Liver and gallbladder disease
- Pancreatitis
This is why careful testing and monitoring are so important.
Why Diagnosis Can Be Complicated
There is no single test that confirms Cushing’s disease in every dog. Cortisol levels naturally fluctuate, and early disease can be difficult to detect.
Diagnosis often involves a step-by-step process using tests such as:
● ACTH stimulation testing
● Low-dose dexamethasone suppression testing
● Advanced adrenal hormone testing
In some dogs, specialized hormone panels can help identify disease when initial screening tests are inconclusive. At VSP, our goal is to reach a clear diagnosis – not guess.
Additional Testing and Staging
Once Cushing’s disease is suspected, further evaluation helps us understand how it is affecting your dog’s body and guides treatment decisions. This may include:
- Blood pressure measurement
- Urine culture to check for hidden infections
- Abdominal ultrasound
- Comprehensive bloodwork
These steps allow us to create a treatment plan tailored specifically to your dog.
Treatment Options
Most dogs are treated medically using a medication called trilostane (Vetoryl), which helps reduce cortisol production to safer levels.
Treatment is individualized and requires regular monitoring to ensure hormone levels stay balanced. Adjustments are common early in therapy as we find the dose that works best for your dog.
Our focus is not just controlling numbers – it’s improving how your dog feels day to day.
Long-Term Outlook
Cushing’s disease is a chronic condition, but it is very manageable. With proper monitoring and treatment, many dogs experience:
Improved energy
Better skin & coat health
Reduced thirst & urination
Improved comfort & quality of life
Ongoing care focuses on maintaining balance while watching for complications over time.
Why Choose VSP for Cushing's Disease Care
Because Cushing’s disease can be complex and sometimes difficult to diagnose, we take a thorough and methodical approach. At Veterinary Specialist Partners, we understand that many dogs require more than a single test or a one-size-fits-all treatment. Our internal medicine teamis focused on identifying the full picture of your dog’s health so treatment decisions are clear, thoughtful, and tailored to your pet.
Our specialists work closely with your primary veterinarian and use advanced diagnostic tools to evaluate challenging or unclear cases. When symptoms persist despite normal screening tests, we take a deeper look, helping families find answers and avoid prolonged uncertainty. From diagnosis through long-term monitoring, our goal is to support both you and your dog with clear communication, careful follow-up, and a plan designed to maintain comfort and quality of life.
Because endocrine diseases change over time, ongoing monitoring and adjustments are an important part of care. Our team guides you through each stage, helping you understand what to expect and ensuring your dog continues to feel their best.
You won’t have to navigate this alone.
When Should You Seek Evaluation?
If your dog is showing persistent changes such as increased thirst, appetite, panting, or muscle weakness, an evaluation may help uncover an underlying hormonal condition.
Early diagnosis can make a meaningful difference in long-term health and comfort.
Frequently Asked {Questions}
What is Cushing's disease in dogs?
Cushing’s disease, also called hyperadrenocorticism, occurs when a dog’s body produces too much cortisol, a hormone made by the adrenal glands. While cortisol is important in normal amounts, excess levels over time can affect multiple organs and lead to the gradual changes pet parents often notice at home.
What causes Cushing's disease in dogs?
In most dogs, Cushing’s disease is caused by a small tumor in the pituitary gland that signals the adrenal glands to produce too much cortisol. Less commonly, a tumor within the adrenal gland itself is responsible. Identifying the cause helps guide the most appropriate treatment plan for your dog.
Is Cushing's disease cancer?
Usually not. The pituitary tumors associated with Cushing’s disease are almost always benign. Some adrenal tumors can be cancerous, but many are not. Even benign tumors, however, can still cause significant illness because of the excess hormone production, which is why proper evaluation is important.
What signs of Cushing's disease can I see at home?
Many pet parents notice gradual changes such as increased thirst and urination, a bigger appetite, panting, hair thinning, slow hair regrowth, or a pot-bellied appearance. Because these signs often develop slowly, they can be easily overlooked at first.
Are there problems I can't see at home?
Yes. Even when dogs seem comfortable, Cushing’s disease can cause internal changes such as high blood pressure, elevated liver values, high cholesterol, or silent urinary tract infections. These hidden effects are one reason diagnostic testing and monitoring are so important.
How is Cushing's disease diagnosed?
Diagnosing Cushing’s disease often requires several steps. Tests such as the ACTH stimulation test or low-dose dexamethasone suppression test help evaluate how your dog’s body regulates cortisol. Because every dog is different, additional specialized testing may be recommended to reach a clear and confident diagnosis.
Can a dog have Cushing's disease if initial tests are negative?
Yes. Some dogs with early or atypical disease may have normal results on initial screening tests. If symptoms continue, further evaluation and advanced testing can help uncover the cause and ensure your dog receives the right care.
Can Cushing's disease cause pancreatitis?
Yes. Dogs with Cushing’s disease have altered fat metabolism and immune suppression, which increases the risk of pancreatitis. Some dogs are diagnosed after recurrent or severe pancreatic episodes.
How is Cushing's disease treated in dogs?
Most dogs are treated with a medication called trilostane (Vetoryl), which helps control cortisol production. Treatment plans are individualized, and regular monitoring allows us to adjust therapy safely so your dog can feel their best.
Will my dog need treatment for life?
In most cases, yes. Cushing’s disease is a long-term condition, but with consistent management and monitoring, many dogs live happy, comfortable lives for years after diagnosis.
Is Cushing's disease painful for my dog?
Cushing’s disease itself is not usually painful, but untreated hormone imbalance can lead to weakness, infections, and other complications over time. Treatment focuses on preventing these problems and improving your dog’s comfort and quality of life.
What is the prognosis for dogs with Cushing's disease?
With accurate diagnosis and ongoing management, the outlook for most dogs is very good. Many patients show noticeable improvements in energy, comfort, and daily activity once treatment is properly adjusted.