Addison's Disease in Dogs: Symptoms and Warning Signs

The tricky part is that the early signs are quiet and easy to miss. A dog might just seem a bit tired, go off its food for a day or two, have a bout of vomiting, then appear to bounce back. Because of this on-and-off pattern, vets often call Addison's the great pretender. According to the MSD Veterinary Manual, the illness can range from mild and vague all the way to a sudden collapse, so it deserves to be taken seriously even when the signs seem small.

Addison's cannot be confirmed by symptoms alone. It needs a vet and blood tests to diagnose. The good news, which is worth holding on to, is that once it is diagnosed and treated with hormone replacement, most dogs go on to live full, normal lives.

Not sure whether what you are seeing needs a vet? You can check your dog's symptoms free in the Omelo app in about 30 seconds and get a plain read on how urgent it looks. In India, you can also book a 15-minute video consultation with a licensed vet for ₹349 at vet.beomelo.com if you would like a professional to look at what you are describing.

The clue is the pattern rather than any single sign. Addison's often waxes and wanes. The dog seems unwell, then recovers, then dips again, and the dips frequently follow something stressful. A boarding stay, a long car journey, a house move, a thunderstorm season, or even a change in routine can tip a dog with borderline adrenal function into a flare. If your dog has repeated, unexplained bouts of feeling off that seem to line up with stressful events, that is worth mentioning to your vet by name, because it can point them toward testing for Addison's sooner.

• Low energy and lethargy, a dog that is flatter than usual and less keen to play or walk.
• Poor appetite or going off food completely.
• Vomiting and diarrhoea, sometimes on and off over weeks.
• Gradual weight loss.
• Shivering, trembling, or muscle weakness.
• Drinking more water and urinating more than usual.
• A generally unwell dog whose signs improve and then return.

You will rarely see all of these at once. It is the combination of vague gut upset, low energy, and a waxing-and-waning course, especially in a young to middle-aged dog, that should put Addison's on the list. Because these signs overlap with so many other conditions, from kidney disease to a simple infection, only blood tests can sort out what is really going on.

Get to your nearest emergency vet immediately, at any hour, if your dog shows:

• Sudden collapse or fainting.
• Severe weakness, or a dog that cannot stand or get up.
• Repeated vomiting or diarrhoea with obvious exhaustion.
• Cold limbs, pale gums, or a dog that feels limp and unresponsive.
• A very slow heartbeat, or breathing that looks laboured.

Do not wait to see if it passes, and do not spend time on an app or a phone booking in this situation. A crisis needs hands-on emergency treatment with intravenous fluids and hormone support. Take your dog to the closest open clinic. If your dog has already been diagnosed with Addison's, tell the emergency team straight away, because it changes how they treat the collapse.

There is also an important cause that owners can influence. Dogs on long-term steroids, or dogs being treated for Cushing's disease with medicines such as trilostane, can develop Addison-like signs if the drug is stopped abruptly or the dose is too high. This is exactly why you should never start or stop steroid medication on your own. Any change to these drugs should be planned with your vet and tapered, not halted overnight.

If you own one of these breeds, you do not need to worry constantly, but it is worth knowing the signs so you can act early. Mixed-breed dogs get Addison's too, so breed is only one piece of the picture, not a rule.

Treatment is lifelong hormone replacement, and it works well. Most dogs are managed with two things together:

• A mineralocorticoid to replace aldosterone, commonly a DOCP injection given every few weeks, or a daily tablet such as fludrocortisone.
• A low daily dose of a glucocorticoid, usually prednisolone, to replace cortisol, with the dose increased during stressful times like travel, illness, or boarding on your vet's instructions.

Your vet will fine-tune the doses with follow-up blood tests over the first weeks and months, then at regular rechecks. Please do not adjust or stop these medicines on your own. Getting the balance right is what keeps your dog stable and out of a crisis. Many owners are relieved to find that once treatment is settled, their dog is back to normal energy, appetite, and spirits.

Practical habits that help:

• Give the medication exactly as prescribed and never skip or double doses.
• Ask your vet ahead of any stressful event, such as boarding, surgery, travel, or festival fireworks season, whether your dog needs an extra glucocorticoid dose.
• Keep up regular rechecks and blood tests so the dose stays right.
• Carry a note or tag saying your dog has Addison's, so any vet who sees them in an emergency knows immediately.
• Learn the crisis red flags above and act on them without delay.

With that routine in place, an Addison's diagnosis is very manageable, and it does not shorten most dogs' lives.

Omelo does not diagnose, treat, or prescribe, and it cannot confirm Addison's disease. Only a vet with blood tests, including an ACTH stimulation test, can do that. Think of the app as the step that helps you decide to go to the vet and how urgently, not a replacement for the clinic. And if your dog collapses or is severely weak, skip the app entirely and go straight to an emergency vet.

In India, if you would like a licensed vet to weigh in before you plan a clinic visit, you can book a 15-minute video consultation for ₹349 at vet.beomelo.com. A vet can talk through the pattern you are seeing and help you decide on next steps, including the in-person testing that Addison's needs to confirm.

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