What is Addison's Disease in Dogs?

Addison’s disease in dogs, also known as hypoadrenocorticism, is a condition where the adrenal glands stop producing enough hormones like cortisol and aldosterone. These hormones play key roles in your dog’s ability to handle stress and regulate electrolytes. The disease is often called “the great imitator” because its symptoms can mimic many other illnesses, making diagnosis tricky. Let’s dive into what Addison’s is, its symptoms, causes, treatments, and how you can help your dog live a happy, healthy life.

What is Addison’s disease?

In plain terms, Addison’s disease (hypoadrenocorticism) happens when your dog’s adrenal glands, tiny organs near the kidneys, stop producing enough cortisol and aldosterone. Cortisol helps your dog respond to stress, while aldosterone keeps vital electrolytes like sodium and potassium balanced. Without these hormones, your dog’s body struggles to handle even basic stressors. While it’s rare, the disease most often affects young to middle-aged female dogs.

Symptoms of Addison’s disease in dogs

Spotting Addison’s disease can be tricky since its symptoms come and go, often looking like other conditions. Here’s what you might notice:

• Lethargy, your dog seems unusually tired or low-energy
• Vomiting and diarrhea, sometimes sporadically
• Appetite loss and weight loss over time
• Increased thirst and frequent urination
• Weakness, muscle tremors, or shaking episodes

If untreated, an Addisonian crisis, which is a sudden collapse due to severe hormone imbalance, can occur. Signs of a crisis include shock, low heart rate, extreme lethargy, or seizures. This is a medical emergency; get your dog to the vet immediately if you see these signs.

Causes of Addison’s disease in dogs

Addison’s disease can happen for several reasons, including:

• Immune system attack: Most common with primary Addison’s, where the immune system destroys adrenal tissue.
• Secondary issues: Problems with the pituitary gland, which signals adrenal function, or misuse of long-term steroid treatments can lead to cortisol deficiencies.
• Other triggers: Infections, trauma, cancer near the adrenal glands, or abrupt withdrawal from steroid medications.

Diagnosis of Addison’s disease in dogs

Your vet might suspect Addison’s based on your dog’s symptoms and medical history, especially if symptoms are irregular or vague. Tests often include:

• Bloodwork and urine panels: Looking for incorrect sodium and potassium levels.
• ACTH stimulation test: This definitive test checks whether the adrenal glands react to ACTH, a hormone responsible for triggering cortisol production.
• Imaging: Ultrasounds or X-rays might rule out other issues.

Addison’s is often diagnosed during a crisis, so fast action matters to get your dog stabilized and properly cared for.

Treating Addison’s disease in dogs

While Addison’s disease is a lifelong condition, it’s very treatable with proper care. Treatment usually includes:

• Hormone therapy: Mineralocorticoids (like monthly DOCP injections or daily fludrocortisone) to replace aldosterone and low-dose glucocorticoids (like prednisone) to replace cortisol.
• Stress dosing: Extra prednisone during illness, surgery, or other high-stress moments.
• Regular monitoring: Frequent blood tests to keep electrolytes balanced and ensure dosages are working.

Your vet will work closely with you to fine-tune your dog’s treatment plan, ensuring they stay healthy and happy.

Breeds prone to Addison’s disease

Some breeds are more prone to this condition, including:

• Portuguese Water Dogs
• Standard Poodles
• Nova Scotia Duck Tolling Retrievers
• Bearded Collies
• Great Danes
• West Highland White Terriers

If you have one of these breeds, knowing the signs of Addison’s disease in dogs is even more essential.

Does pet insurance cover Addison’s disease?

Yes, Addison’s disease is covered under Lemonade Pet’s base accident and illness policy, as long as it isn’t pre-existing. That includes eligible costs like diagnostic testing, medications, and the ongoing bloodwork that’s typically part of managing the condition long-term.

Addison’s requires consistent monitoring: regular vet visits to check electrolyte levels, adjust medications, and make sure your dog is stable. The Visit Fee add-on can help cover the exam fees tied to these appointments, so the recurring cost of staying on top of things doesn’t add up quietly in the background.

Getting a policy in place before any symptoms appear is especially important here. Addison’s can present suddenly and severely, and once signs show up, the condition is typically considered pre-existing and won’t be eligible for coverage. If your dog is healthy now, that’s the time to act.

Before we go

A diagnosis like Addison’s can feel overwhelming at first, but most dogs manage it really well with the right care in place. The fact that you’re here, learning about it, already says a lot about the kind of owner you are. Work closely with your vet, stay on top of the monitoring, and take it one step at a time. If covering the long-term costs is on your mind, it’s worth seeing what Lemonade pet insurance can do for you. Get a quote today.

A few quick words, because we <3 our lawyers: This post is general in nature, and any statement in it doesn’t alter the terms, conditions, exclusions, or limitations of the policies issued, which differ according to your state of residence. You’re encouraged to discuss your specific circumstances with your own professional advisors. The purpose of this post is merely to provide you with info and insights you can use to make such discussions more productive! Naturally, all comments by, or references to, third parties represent their own views, and Lemonade assumes no responsibility for them. Coverage may not be available in all states. Please note that statements about coverages, policy management, claims processes, Giveback, and customer support apply to policies underwritten by Lemonade Insurance Company or Metromile Insurance Company, a Lemonade company, sold by Lemonade Insurance Agency, LLC.  The statements do not apply to policies underwritten by other carriers.