Is your dog suddenly drinking enough water to fill a kiddie pool? Or are they too weak to climb the stairs?
Two tiny glands near your dog’s kidneys could be behind two very different problems. One disease pumps out too much cortisol. The other doesn’t make enough. Both can sneak up on you — but the symptoms look nothing alike.
In this guide, we’ll help you spot the difference between Cushing’s Disease vs Addison’s Disease in dogs before a small issue becomes an emergency.
What Do the Adrenal Glands Actually Do for Your Dog?
Think of the adrenal glands as your dog’s internal stress managers. These small, bean-shaped glands sit right next to the kidneys and produce two critical hormones:
- Adrenaline (epinephrine) – The “fight or flight” booster. It cranks up the heart rate and energy levels in dangerous moments.
- Cortisol – The body’s thermostat for metabolism, immune response, blood pressure, and stress regulation.
When these glands work properly, your dog bounces back from stress, maintains steady energy, and stays healthy. When they malfunction? That’s when you run into Cushing’s or Addison’s.
Without healthy adrenal function, dogs can struggle with stress management, energy crashes, and serious metabolic issues.
Cushing’s Disease in Dogs (Hyperadrenocorticism)
Too much cortisol. That’s Cushing’s in a nutshell.
Also known as hyperadrenocorticism, this condition happens when the adrenal glands go into overdrive and flood the body with cortisol. It’s more common than Addison’s, especially in older dogs.
Symptoms of Cushing’s Disease
Watch for these red flags:
- Increased thirst and urination (like refilling the water bowl constantly)
- Ravenous appetite
- Hair loss and thinning skin
- Muscle wasting
- A pot-bellied appearance
Causes of Cushing’s Disease
There are three main culprits:
- Pituitary-dependent Cushing’s (most common) – a benign tumor on the pituitary gland causes too much ACTH, which overstimulates the adrenal glands.
- Adrenal tumor – a growth directly on the adrenal gland.
- Long-term steroid use – certain medications can trigger the same effects.
The treatment depends entirely on the underlying cause.
Treatment of Cushing’s Disease
Options include:
- Surgery to remove the tumor
- Medications that suppress cortisol production
- Radiation therapy (for pituitary tumors)
Here’s the honest truth: even with treatment, Cushing’s is often a chronic condition that requires lifelong management. Regular blood work and check-ups are non-negotiable. In some cases, the disease isn’t curable — but treatment can control symptoms and give your dog a good quality of life.
Breed Predisposition to Cushing’s Disease
Some breeds are simply more likely to develop Cushing’s. If you own one of these, keep a closer eye on those symptoms.
According to veterinary literature, these are 10 breeds with a predisposition to Cushing’s Disease:
- Miniature Poodle
- Dachshund
- Boxer
- Boston Terrier
- Yorkshire Terrier
- Staffordshire Bull Terrier
- Bichon Frise
- Border Terrier
- Miniature Schnauzer
- Lhasa Apso
Sources: merckvetmanual.com | veterinary-practice.com
Addison’s Disease in Dogs (Hypoadrenocorticism)
Too little cortisol. That’s Addison’s.
Also called hypoadrenocorticism, this is the opposite problem. The adrenal glands don’t produce enough hormones — including cortisol and aldosterone. It’s much rarer than Cushing’s, with an estimated prevalence of only 0.06% to 0.28% of the canine population.
How Vets Diagnose Both Diseases
To tell Cushing’s and Addison’s apart, veterinarians often start with urine tests to check for electrolyte imbalances. From there, blood tests and imaging (like ultrasound) may be used. The ACTH stimulation test is the gold standard for diagnosing Addison’s — and it also helps confirm Cushing’s. Early detection is everything.
Symptoms of Addison’s Disease
Addison’s symptoms can be vague at first, then suddenly severe. Look for:
- Lethargy and weakness
- Severe vomiting and diarrhea
- Weight loss
- Loss of appetite
Watch for an “Addisonian crisis” – sudden collapse, severe weakness, and shock. This is a medical emergency that requires immediate veterinary attention.
Causes of Addison’s Disease
The most common cause is autoimmune destruction – the dog’s own immune system mistakenly attacks the adrenal glands. Less common causes include tumors, infections, or sudden withdrawal of steroid medications.
Treatment of Addison’s Disease
There’s no cure, but there is excellent management. Treatment involves hormone replacement therapy – daily medications that replace what the adrenal glands can’t make. This is a lifelong commitment.
With proper treatment, most dogs with Addison’s live a normal lifespan. Without treatment? The disease can be fatal. One study found that dogs with untreated adrenal insufficiency had a mortality rate of 664 per 10,000 dog-years – nearly double that of the general dog population.
Breed Predisposition to Addison’s Disease
While any dog can develop Addison’s, these breeds are overrepresented. If you have one of these pups, be extra vigilant.
According to veterinary literature, these are 10 breeds with a predisposition to Addison’s Disease:
- Standard Poodle
- West Highland White Terrier
- Bearded Collie
- Great Dane
- Portuguese Water Dog
- Nova Scotia Duck Tolling Retriever
- Soft-Coated Wheaten Terrier
- Labrador Retriever
- Rottweiler
- Wheaten Terrier
Sources: merckvetmanual.com | vet.cornell.edu
Frequently Asked Questions (FAQs) about Cushing’s Disease and Addison’s Disease
What are the symptoms of Cushing’s Disease vs Addison’s Disease in dogs?
Cushing’s causes increased thirst, urination, appetite, hair loss, and a pot belly. Addison’s causes vomiting, diarrhea, weakness, lethargy, and weight loss. One is too much cortisol; the other is too little.
How are Cushing’s and Addison’s diagnosed?
Both typically require blood tests, urine tests, and the ACTH stimulation test. This test measures how well your dog’s adrenal glands respond to a synthetic hormone. Imaging like ultrasound may also be used.
Can these diseases be cured?
Generally, no – but both can be managed. Cushing’s requires lifelong medication to control cortisol. Addison’s requires lifelong hormone replacement therapy. With proper care, dogs with either condition can live good lives.
Can a dog have both Cushing’s and Addison’s?
It’s extremely rare, but possible – usually when a dog is treated for Cushing’s and the medication overshoots, causing cortisol to drop too low. This is called “iatrogenic” combined disease.
Which is worse: Cushing’s or Addison’s in dogs?
Neither is “worse” – they’re dangerous in different ways. Addison’s can trigger an Addisonian crisis, which is immediately life-threatening. Cushing’s slowly damages organs over months or years. Both require veterinary care.
How much does treatment cost for Cushing’s vs Addison’s?
Cushing’s treatment typically costs $50–$200/month for medication plus regular monitoring. Addison’s is more expensive initially (diagnosis and crisis care) but stabilizes at $100–$300/month for lifelong hormone replacement.
What breeds are most at risk for Addison’s?
Standard Poodles, West Highland White Terriers, Bearded Collies, Great Danes, Portuguese Water Dogs, and Rottweilers top the list. See the full breed list above.
What breeds are most at risk for Cushing’s?
Miniature Poodles, Dachshunds, Boxers, Boston Terriers, Yorkshire Terriers, and Bichon Frises are among the most commonly affected. Full list above.
What happens if Cushing’s goes untreated in dogs?
Untreated Cushing’s leads to high blood pressure, diabetes, kidney damage, blood clots, and recurring infections. It slowly reduces quality of life and can eventually become fatal.
How long will a dog live with Addison’s disease?
With proper treatment – a normal lifespan. Without treatment, many dogs die within weeks or months, often during an Addisonian crisis. Treatment truly makes all the difference.
Is there a natural treatment for Cushing’s in dogs?
Some supplements (like melatonin or lignans) may help mild cases, but veterinary guidance is essential. There is no proven natural replacement for the medications that control moderate to severe Cushing’s.
Is there any link between diet and Cushing’s or Addison’s disease in dogs?
No, diet does not cause either condition. However, diet can help manage them. For Cushing’s, a low-fat, moderate-fiber diet helps with weight control. For Addison’s, some dogs need extra sodium. Always consult your vet before changing your dog’s diet.
Cushing’s Disease vs Addison’s Disease in Dogs – Final Thoughts
Two adrenal diseases. Two opposite problems. One goal: getting your dog the right care.
Cushing’s means too much cortisol – your dog drinks, eats, and pees like crazy, loses hair, and gets a pot belly.
Addison’s means too little cortisol – your dog is weak, vomits, loses weight, and can suddenly crash.
Both require a vet’s diagnosis. Both require lifelong management. But with the right treatment, dogs with either condition can live happy, healthy lives.
Bottom line: If your dog’s behavior changes dramatically – whether it’s nonstop thirst or sudden weakness – don’t guess. See your vet. The difference could save their life.
The information provided in this post is for educational and informational purposes only and is not intended as a substitute for professional veterinary advice, diagnosis, or treatment. Always seek the advice of a licensed veterinarian with any questions you may have regarding your dog’s medical condition. Never disregard professional veterinary advice or delay seeking it because of something you have read on this website.
