A dog with Addison’s disease needs a diet that supports stable electrolytes, steady energy, and easy digestion. Because Addison’s disrupts your dog’s ability to regulate sodium and potassium on its own, what you put in the bowl matters more than it does for a healthy dog. The good news: with the right medication and thoughtful feeding, most dogs with Addison’s live normal, active lives.
Why Diet Matters With Addison’s Disease
Addison’s disease (hypoadrenocorticism) means your dog’s adrenal glands don’t produce enough of two critical hormones. One regulates the body’s stress response and blood sugar. The other controls the balance of sodium and potassium in the blood. At diagnosis, dogs typically have dangerously low sodium (sometimes dropping to 107 mEq/L, well below the normal range) and elevated potassium levels that can climb above 10 mEq/L. Medication corrects most of this imbalance, but diet plays a supporting role in keeping those levels steady between vet visits.
Electrolytes are checked frequently during treatment, often weekly at first, then at regular intervals as your dog stabilizes. If sodium drops too low or potassium creeps too high, your vet adjusts medication doses. But consistent, appropriate nutrition helps reduce the size and frequency of those adjustments.
Sodium and Potassium: The Key Balance
The single most important dietary consideration for a dog with Addison’s is the sodium-to-potassium ratio in their food. Dogs with this condition tend to lose sodium and retain potassium, so their diet should not restrict salt and should avoid being excessively high in potassium.
In practical terms, this means:
- Don’t feed low-sodium diets. Many “senior” or “heart-healthy” dog foods are formulated with reduced sodium. These work against what an Addisonian dog needs. Standard sodium levels, or even slightly elevated sodium, are typically appropriate.
- Watch high-potassium ingredients. Foods heavy in bananas, sweet potatoes, beans, or spinach can push potassium levels up. These aren’t necessarily off-limits, but they shouldn’t dominate the diet.
- Read labels carefully. If you’re comparing commercial foods, look at the guaranteed analysis for sodium and potassium content per serving. A food with a higher sodium-to-potassium ratio is generally a better fit.
Your vet can tell you your dog’s current electrolyte levels, which helps guide how strict you need to be. A dog whose levels are well-controlled on medication has more dietary flexibility than one whose numbers are still being stabilized.
Choosing the Right Food
There is no single “Addison’s diet” sold off the shelf, but several categories of commercial food work well. Prescription diets formulated for endocrine disorders exist and may be recommended by your vet. Some gastrointestinal-focused prescription diets also work because they’re highly digestible and have controlled mineral profiles, which helps dogs whose Addison’s causes intermittent stomach upset, vomiting, or diarrhea.
If you prefer a standard commercial food over a prescription diet, look for one that meets these criteria:
- Complete and balanced nutrition with an AAFCO statement for your dog’s life stage
- Moderate to normal sodium content (not a reduced-salt formula)
- High digestibility, meaning the protein sources are quality animal proteins rather than mostly plant-based fillers
- Moderate fat, since dogs recovering from Addison’s flare-ups can have sensitive stomachs
Wet food can be a good choice for dogs with Addison’s because it contributes additional water intake, which matters for a condition where dehydration is a real risk. Mixing wet food into kibble is a simple way to increase both moisture and palatability, especially for dogs whose appetite fluctuates.
Home-Cooked and Raw Diets
Some owners prefer to cook for their Addisonian dog, which gives you direct control over sodium and potassium levels. This can work well, but it requires careful formulation. A homemade diet that isn’t properly balanced can make electrolyte problems worse rather than better.
If you go this route, lean meats like chicken, turkey, and lean beef are good protein foundations. White rice and pasta are easily digestible carbohydrate sources that are relatively low in potassium compared to sweet potatoes or legumes. You can add a small amount of salt to meals to support sodium levels, though the amount should be guided by your vet based on your dog’s bloodwork.
Raw diets are trickier. They tend to be very high in protein and can have unpredictable mineral profiles from batch to batch. If you’re committed to raw feeding, work with a veterinary nutritionist who can formulate a recipe specific to your dog’s electrolyte needs. Guessing at ratios with a condition this sensitive to mineral balance is risky.
Feeding Schedule and Portions
Dogs with Addison’s are prone to blood sugar fluctuations because their bodies produce less of the hormone that helps regulate glucose during stress or fasting. Feeding two to three smaller meals throughout the day, rather than one large meal, helps keep blood sugar more stable. This is especially important for dogs that are still being stabilized on medication or those prone to lethargy and weakness between meals.
Portion size should maintain a healthy body weight. Dogs newly diagnosed with Addison’s are often underweight because the disease causes poor appetite, vomiting, and muscle wasting before it’s caught. You may need to feed slightly more than the label suggests until your dog regains lost weight, then scale back to a maintenance amount. Weigh your dog regularly rather than eyeballing it, since gradual weight changes are easy to miss under a coat of fur.
Hydration Is Critical
Addisonian dogs lose more sodium through their kidneys than healthy dogs, and sodium loss pulls water with it. This makes dehydration a constant background risk, not just during a crisis. The general guideline for healthy dogs is roughly 1 milliliter of water per calorie consumed each day. Dogs with Addison’s often need more than that.
Keep fresh water available at all times, in multiple locations if your dog is less mobile or reluctant to drink. Some signs of mild dehydration are subtle: slow skin turgor (when you gently pinch the skin on the back of the neck, it should snap back immediately), dry gums, and concentrated urine that’s darker yellow than usual. Research on working dogs has shown that skin turgor can detect dehydration as mild as a 0.8% loss of body weight, making it a practical at-home check.
Adding water or low-sodium broth to your dog’s food at mealtimes is one of the simplest ways to increase fluid intake, especially for dogs that aren’t enthusiastic drinkers. Bone broth without onion or garlic seasoning is a popular option that most dogs find appealing.
Treats and Supplements
Treats are fine in moderation, but choose them with the same principles in mind. Avoid treats that are very high in potassium. Plain cooked meat, small pieces of cheese (which contains sodium), and commercial treats without exotic ingredient lists all work. Freeze-dried liver treats, while popular, are quite high in potassium, so keep those to an occasional reward rather than a daily habit.
Most dogs on a complete and balanced commercial diet don’t need additional supplements. However, some owners add a small amount of table salt to meals if their dog’s sodium levels run low between checkups. This is only appropriate when guided by bloodwork results. Adding salt blindly can overshoot, especially if your dog’s mineralocorticoid medication dose is already being adjusted.
Omega-3 fatty acids from fish oil can support coat health and reduce inflammation in dogs that experienced significant weight loss or skin changes before diagnosis. Probiotics may help dogs with lingering digestive issues, since GI symptoms are common with Addison’s and can persist even after the disease is otherwise well-managed.
Foods to Limit or Avoid
- Low-sodium or “heart health” formulas: These restrict the very mineral your dog needs most.
- High-potassium produce in large amounts: Bananas, pumpkin, and sweet potatoes are fine as occasional small additions but shouldn’t be dietary staples.
- Grain-free diets heavy in legumes: These are high in potassium and have been linked to heart concerns in some dogs regardless of Addison’s status.
- Highly processed or inconsistent foods: Bargain brands with variable ingredient sourcing make it harder to maintain consistent electrolyte intake from meal to meal.
The overarching goal is consistency. Dogs with Addison’s do best when their food, feeding times, and environment stay predictable. Sudden diet changes can trigger GI flare-ups that mimic an Addisonian crisis, creating unnecessary panic and vet visits. If you need to switch foods, transition gradually over 7 to 10 days by mixing increasing amounts of the new food with the old.