Addison’s Disease in Dogs: A Guide
Addison’s disease in dogs can be confusing because the signs often look like many other health problems. One week your dog may seem tired or off their food, and another week they may have vomiting, diarrhea, shaking, weakness, or symptoms that improve and then come back.
It can be scary, but knowing the signs helps you act sooner. At Good Dog Veterinary Care, we provide all dog veterinary service in Atlanta, Georgia and can help determine whether your dog’s symptoms are connected to Addison’s disease or another medical issue. If your dog is weak, vomiting, collapsing, or just not acting like themselves, reach out to one of our locations:
Quick Answer: What is Addison’s Disease in Dogs?
Addison’s disease in dogs is also called hypoadrenocorticism. It happens when the adrenal glands do not produce enough of the hormones your dog needs to stay stable and respond to stress.
The main hormones involved are cortisol and aldosterone. Cortisol helps the body respond to stress, illness, and daily demands. Aldosterone helps regulate sodium, potassium, hydration, blood pressure, and fluid balance.
When these hormones are too low, dogs can develop vague symptoms like vomiting, diarrhea, weakness, shaking, appetite changes, and low energy. These signs may come and go, which is why Addison’s disease is easy to miss.
Addison’s can become life threatening if hormone levels drop too low. The good news is that many dogs do very well once they are diagnosed, stabilized, and managed with medication and monitoring.
Why Addison’s Disease is Easy to Miss
Addison’s disease is often called the great pretender because it can look like a stomach bug, stress reaction, dehydration, kidney issue, or general weakness.
Many dogs first show digestive signs like vomiting, diarrhea, appetite loss, weight loss, or abdominal discomfort. At first, owners may think their dog ate something bad or just needs a bland diet. The concern is when symptoms improve temporarily, then return.
Addison’s can also look like low energy or stress. Dogs may seem tired, weak, shaky, quiet, or not like themselves. Symptoms can become worse during stressful events because dogs with Addison’s do not have enough cortisol to respond normally.
The back and forth pattern is the key clue. If your dog has good days and bad days, repeated vague illness, or symptoms that keep coming back without a clear reason, deeper veterinary testing may be needed.
What Causes Addison’s Disease in Dogs?
The adrenal glands are small glands near the kidneys. They produce cortisol and aldosterone, which help regulate stress response, fluid balance, electrolytes, blood pressure, and hydration.
In many dogs, Addison’s disease is suspected to happen when the immune system damages the adrenal tissue. As the adrenal glands are damaged, hormone production drops over time. This can make symptoms appear gradually.
Some cases are connected to medication history. Treatment for Cushing’s disease may suppress adrenal function too much. Abruptly stopping long term steroid medication can also trigger adrenal hormone problems, which is why medication history matters during diagnosis.
Less common causes can include infection, cancer, trauma, pituitary gland disease, or other adrenal gland damage. Some dogs also develop atypical Addison’s disease, where cortisol is low but the classic sodium and potassium changes may not show up at first.
Dogs at Higher Risk for Addison’s Disease
Addison’s disease can affect any dog. It is often seen in young to middle aged dogs, and females may be affected more often.
Some breeds appear more predisposed, including Standard Poodles, Portuguese Water Dogs, Bearded Collies, Great Danes, Nova Scotia Duck Tolling Retrievers, Labrador Retrievers, West Highland White Terriers, Rottweilers, Wheaten Terriers, and Leonbergers.
Breed risk does not mean only these dogs get Addison’s disease. Any dog with repeated vague illness, weakness, vomiting, diarrhea, shaking, appetite loss, or symptoms that keep returning should be evaluated.
Signs of Addison’s Disease in Dogs
The signs of Addison’s disease can be mild, severe, or somewhere in between. Some dogs have symptoms for weeks or months before diagnosis because the signs do not always point clearly to one condition.
Digestive signs
Digestive symptoms are common. Dogs may vomit, have diarrhea, lose interest in food, lose weight, or show signs of abdominal discomfort.
These signs often make owners suspect a stomach problem first. That is understandable, but repeated vomiting, diarrhea, poor appetite, or weight loss should be checked by a veterinarian.
Energy and behavior changes
Dogs with Addison’s disease may seem tired, weak, depressed, shaky, or just off. They may sleep more, move less, or seem less interested in normal routines.
These symptoms can become worse after stress because the body does not have enough cortisol to respond normally.
Thirst, urination, and dehydration
Addison’s disease can affect fluid balance, sodium, potassium, blood pressure, and hydration. Some dogs drink more water, urinate more often, or become dehydrated.
Electrolyte changes can make dogs feel weak and sick. In more serious cases, they can affect the heart and circulation.
Collapse or sudden weakness
Severe weakness, collapse, shock signs, or trouble standing can signal an Addisonian crisis. This is an emergency.
Do not wait to see if your dog improves if they collapse, cannot stand, or seem severely weak. They need immediate veterinary care.
What Is an Addisonian Crisis?
An Addisonian crisis is the emergency form of Addison’s disease. It can happen when adrenal hormone levels become critically low and the body can no longer keep blood pressure, hydration, electrolytes, and stress response stable.
Dogs in an Addisonian crisis may have sudden weakness, severe vomiting, diarrhea, collapse, dehydration, low blood pressure, abnormal sodium or potassium levels, low blood sugar, or heart rhythm problems.
This is not a wait and see situation. Seek urgent veterinary care if your dog has collapse, severe weakness, repeated vomiting, severe diarrhea, extreme lethargy, trembling with major illness, refusal to eat or drink, pale gums, sudden worsening after stress, or trouble standing.
How Veterinarians Diagnose Addison’s Disease in Dogs
Diagnosing Addison’s disease takes more than looking at symptoms. Because the signs can mimic many other conditions, your veterinarian will use your dog’s history, physical exam, lab work, and specific adrenal testing to get answers.
Your veterinarian will ask when symptoms started, whether they come and go, and what patterns you have noticed at home. Helpful details include vomiting and diarrhea history, appetite changes, thirst and urination changes, weight loss, shaking, weakness, stress triggers, and medication history.
Bloodwork and urine testing may show clues like dehydration, electrolyte changes, kidney value changes, blood sugar changes, or poor urine concentration. These tests can raise suspicion, but they usually do not confirm Addison’s disease by themselves.
The ACTH stimulation test is the main test used to confirm Addison’s disease. It measures cortisol before and after a synthetic hormone signal. Dogs with Addison’s disease do not respond normally, which helps your veterinarian make the diagnosis.
Physical exam
During the physical exam, your veterinarian will look at your dog’s overall stability. This includes hydration, weakness, heart rate, gum color, abdominal discomfort, weight, and body condition.
These details help your vet understand how sick your dog is and whether they may be dehydrated, painful, weak, or unstable. If your dog seems very weak, has pale gums, or shows signs of shock, the visit may become urgent quickly.
Bloodwork and urine testing
Bloodwork and urine testing can give your veterinarian important clues. A CBC, chemistry panel, and urinalysis may show changes linked to Addison’s disease or help rule out other illnesses.
Your vet may look closely at sodium and potassium levels, kidney values, blood sugar, hydration status, and urine concentration. Some dogs with Addison’s disease have electrolyte changes that raise suspicion right away.
Routine testing does not always confirm Addison’s disease by itself, but it can point your veterinarian in the right direction and help decide what testing should come next.
ACTH stimulation testing
The ACTH stimulation test is the main test used to confirm Addison’s disease. It checks whether your dog’s adrenal glands can respond the way they should.
Your veterinarian measures cortisol before and after giving synthetic ACTH, which is a hormone signal that tells the adrenal glands to produce cortisol. Dogs with Addison’s disease do not respond normally, so their cortisol stays low.
This test matters because Addison’s disease usually needs lifelong treatment. Your veterinarian needs a clear diagnosis before building a long term medication and monitoring plan.
Imaging or additional testing
Some dogs may need additional testing, depending on their symptoms and lab results. This may include X rays, abdominal ultrasound, intestinal parasite screen, and or an ECG if abnormal potassium levels may be affecting the heart.
These tests do not replace adrenal testing, but they can help rule out other causes of vomiting, weakness, collapse, or abnormal lab work.
Diagnosis is about the full picture. Your veterinarian will combine your dog’s history, exam findings, lab work, and adrenal testing to decide whether Addison’s disease is the cause.
How Addison’s Disease in Dogs Is Treated
Treatment depends on how sick your dog is when Addison’s disease is found. A stable dog may start a long term medication plan, while a dog in crisis may need hospitalization right away.
Treatment for stable dogs
Most stable dogs with Addison’s disease need lifelong hormone replacement. The goal is to replace the hormones the adrenal glands are not making enough of.
Some dogs receive DOCP injections, such as Percorten V or Zycortal, to help replace aldosterone support. Oral prednisone may also be used when cortisol support is needed.
Some dogs may take fludrocortisone instead. The right medication plan depends on your dog’s test results, electrolyte levels, symptoms, overall health, and how they respond over time.
Treatment during an Addisonian crisis
An Addisonian crisis requires urgent care. Dogs may need hospitalization, IV fluids, electrolyte correction, blood pressure support, glucose support, injectable steroids, and GI support if vomiting or diarrhea is severe.
The goal is to stabilize the body first. Once dehydration, blood pressure, electrolytes, and blood sugar are under control, your veterinarian can move toward a long term treatment plan.
This is why collapse, severe weakness, repeated vomiting, or severe diarrhea should never be ignored.
Long term monitoring
Long term monitoring is a major part of Addison’s disease care. Dogs usually need regular bloodwork and electrolyte checks so the medication dose can be adjusted when needed.
Your veterinarian will watch for signs of under treatment, such as weakness, vomiting, diarrhea, poor appetite, or low energy. They will also watch for signs of over treatment, which can include increased thirst, increased urination, panting, increased appetite, or weight changes.
Owners need to follow the schedule closely. Missed injections, skipped medication, or missed bloodwork can lead to serious setbacks.
Can Dogs Live Normally With Addison’s Disease?
Many dogs do very well once Addison’s disease is diagnosed and stabilized. There is no cure, but treatment can be very successful with the right medication and monitoring.
Most dogs need lifelong care. That usually means staying consistent with medication, keeping up with rechecks, and watching for changes at home.
Many dogs can return to normal activity and a good quality of life after treatment begins. The biggest risks come from missed medications, skipped monitoring, or stress events that are not managed with veterinary guidance.
If your dog has Addison’s disease, ask your veterinarian what to do during illness, travel, surgery or any anesthetic event, boarding, or major stress. Some dogs may need medication adjustments during those times.
What Not to Do if You Suspect Addison’s Disease
Do not wait if your dog is weak, collapsing, or severely ill. Addison’s disease can become life threatening when hormone levels drop too low.
Do not assume recurring vomiting or diarrhea is always a simple stomach issue. If symptoms keep returning, your dog needs a deeper look.
Do not stop steroid medications suddenly without veterinary guidance. Abruptly stopping steroids can affect adrenal hormone function.
Do not change prescribed Addison’s medication without talking to your veterinarian. Even if your dog seems better, the medication may be what is keeping them stable.
Do not skip follow up bloodwork. Monitoring helps your veterinarian keep the dose safe and effective.
Do not ignore symptoms that improve and return. That pattern is one of the reasons Addison’s disease can be missed.
When to Call the Vet
Addison’s disease can look mild at first, but it can become serious quickly. When symptoms repeat, worsen, or seem unusual for your dog, it is time to call.
Call soon if you notice
Call your veterinarian if your dog has repeated vomiting, diarrhea that keeps coming back, unexplained weight loss, low appetite, increased thirst or urination, shaking, weakness, low energy, or symptoms that wax and wane.
These signs do not always mean Addison’s disease, but they do mean your dog needs medical attention. A pattern of vague illness is worth checking before it turns into an emergency.
Call urgently if you notice
Call urgently if your dog collapses, has severe weakness, repeated vomiting, severe diarrhea, trouble standing, pale gums, extreme lethargy, sudden worsening, or signs of dehydration.
These signs may point to an Addisonian crisis or another serious medical condition. Do not wait to see if your dog improves on their own.
Frequently Asked Questions About Addison’s Disease in Dogs
What is Addison’s disease in dogs?
Addison’s disease is a hormone deficiency condition. It is also called hypoadrenocorticism.
It happens when the adrenal glands do not produce enough cortisol and sometimes not enough aldosterone. Cortisol helps the body respond to stress. Aldosterone helps regulate sodium, potassium, hydration, blood pressure, and fluid balance.
Why is Addison’s disease called the great pretender?
Addison’s disease is called the great pretender because the signs are often vague and can mimic many other illnesses.
A dog may seem like they have a stomach problem, kidney issue, stress reaction, dehydration, or general weakness. The symptoms may also come and go, which makes the disease harder to recognize early.
Is Addison’s disease in dogs an emergency?
Stable symptoms need veterinary care, but some signs are urgent. Collapse, severe weakness, repeated vomiting, severe diarrhea, pale gums, shock signs, or trouble standing may point to an Addisonian crisis.
An Addisonian crisis is an emergency and may require hospitalization.
How is Addison’s disease diagnosed?
Veterinarians diagnose Addison’s disease by looking at the full picture. This may include medical history, physical exam, bloodwork, urine testing, electrolyte review, and adrenal function testing.
The ACTH stimulation test is the main test used to confirm Addison’s disease.
Can Addison’s disease in dogs be cured?
Addison’s disease usually cannot be cured, but it can often be managed very well.
Most dogs need lifelong medication and monitoring. With the right plan, many dogs feel much better and return to a normal routine.
How long can a dog live with Addison’s disease?
Many dogs with Addison’s disease can live a normal or near normal lifespan with proper treatment.
The key is consistency. Dogs need the right medication, regular veterinary monitoring, and prompt care if symptoms return or stress events occur.
What breeds are prone to Addison’s disease?
Addison’s disease can affect any breed, but some breeds appear more prone to it.
These include Standard Poodles, Portuguese Water Dogs, Bearded Collies, Great Danes, Nova Scotia Duck Tolling Retrievers, Labrador Retrievers, West Highland White Terriers, Rottweilers, Wheaten Terriers, and Leonbergers.
Can Addison’s disease be prevented?
Addison’s disease is not usually preventable. In many dogs, it is linked to immune mediated damage or other causes owners cannot control.
Regular veterinary care can still help. Wellness exams and early testing can identify illness sooner and may reduce the risk of a dog reaching a crisis before diagnosis.
Helping Your Dog Get the Right Care
Addison’s disease can be scary because the signs are vague and may come and go. A dog may seem better for a while, then suddenly become sick again.
Early testing matters when a dog has repeated vomiting, diarrhea, weakness, shaking, appetite loss, or unexplained illness. With the right diagnosis, treatment, and monitoring, many dogs with Addison’s disease can live happy, comfortable lives.
Good Dog Veterinary Care can evaluate your dog, run appropriate testing, and build a treatment plan if Addison’s disease or another internal medicine issue is suspected.
If your dog is vomiting, weak, shaking, collapsing, losing weight, drinking more than usual, or just not acting like themselves, Good Dog Veterinary Care can help. Our dog only veterinary team provides all dog veterinary service in Atlanta, Georgia across three convenient locations.
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