Canine Cushing's Disease Diet in Canada: What to Feed and What Ingredients to Avoid

Cushing's disease (hyperadrenocorticism) is one of the most common endocrine disorders in dogs, and the right diet can make an enormous difference in how a dog feels day to day. If your veterinarian has just diagnosed your dog with Cushing's, you're probably already overwhelmed — and wondering whether what's in your dog's bowl is helping or hurting. This guide breaks down exactly what the research and our in-store nutrition experience say about a Cushing's disease dog diet in Canada, including what ingredients to prioritize, what to avoid, and which brands available at Ashario Pets may be worth discussing with your vet.

Key Takeaway: Dogs with Cushing's disease generally do best on a diet that is low in fat (ideally under 12% fat on a dry matter basis), moderate in high-quality protein, low in simple carbohydrates, and free from artificial additives and fillers. Always work with your veterinarian to confirm any dietary changes for a dog managing hyperadrenocorticism.

What Is Cushing's Disease in Dogs and Why Does Diet Matter?

Cushing's disease (hyperadrenocorticism) in dogs is a condition in which the adrenal glands produce excess cortisol, affecting metabolism, immune function, skin health, and muscle mass. Because elevated cortisol directly disrupts fat metabolism and insulin sensitivity, diet becomes a critical management tool alongside any medication your vet prescribes.

Excess cortisol causes the body to break down muscle protein and store more fat, particularly around the abdomen. Dogs with Cushing's often appear pot-bellied, tire easily, drink and urinate excessively, and are prone to skin infections. According to the American Veterinary Medical Association (AVMA), Cushing's disease is most commonly seen in middle-aged to older dogs and requires lifelong medical management. Diet alone cannot treat the disease, but it can meaningfully reduce the metabolic burden on an already-stressed system.

The key nutritional priorities are: controlled fat content, quality protein to protect lean muscle mass, low glycemic carbohydrates to support insulin sensitivity, and digestive support through probiotics and fiber. As of 2026, most veterinary nutritionists agree that a fat content below 12% (dry matter basis) is a reasonable target for dogs with hyperadrenocorticism.

What Fat and Protein Levels Should a Cushing's Dog Food Have?

For dogs with Cushing's disease, target a dog food with a fat content of 8–12% on a dry matter basis and a protein content of at least 25–30%. High-quality animal protein helps preserve lean muscle, while controlled fat reduces the risk of pancreatitis — a condition dogs with Cushing's are disproportionately prone to developing.

Reading a guaranteed analysis label is essential. Fat content listed on kibble bags reflects "as-fed" percentages. To calculate dry matter fat, divide the fat percentage by (100 minus the moisture percentage), then multiply by 100. A kibble showing 10% fat and 10% moisture has a dry matter fat of approximately 11.1% — within range for most Cushing's dogs. Our nutrition experts at the North York store walk customers through this calculation regularly, because it genuinely surprises many pet owners how much moisture skews the numbers on wet food labels.

Protein should come from named meat sources — chicken, turkey, salmon, or bison — rather than vague "meat meal" listings. AAFCO requires that pet foods meeting its nutrient profiles for adult maintenance contain a minimum of 18% protein on a dry matter basis, but dogs managing Cushing's typically need more than the minimum to offset muscle wasting. Aim for 25–30% or higher from quality sources.

Omega-3 fatty acids (from fish oil or whole fish ingredients) at approximately 50–100 mg per kg of body weight daily can support skin health and reduce inflammation — both valuable for Cushing's dogs prone to skin issues. Look for foods that list omega-3 and omega-6 content on the label, or ask about adding a separate supplement.

Which Ingredients Should Dogs with Cushing's Avoid?

Dogs with Cushing's disease should avoid high-fat ingredients, simple sugars, refined carbohydrates, and artificial preservatives. Common culprits include corn syrup, white rice, white potato, and foods with rendered fat as a primary ingredient. These can spike blood glucose and worsen insulin resistance that often accompanies hyperadrenocorticism.

Specific ingredients to watch for and minimize:

• High-fat animal fats listed early in the ingredient list — increases pancreatitis risk
• Corn, wheat, and white potato as primary carbohydrate sources — high glycemic index, may worsen insulin sensitivity
• Artificial colours, flavours, and chemical preservatives (BHA, BHT, ethoxyquin) — add unnecessary metabolic load
• By-product meals without named species — variable quality and digestibility
• Sugar or corn syrup in treat ingredients — no place in a Cushing's dog's diet
• High-sodium ingredients — Cushing's dogs are already prone to hypertension

Treats are an easy oversight. Many commercial dog treats are loaded with fat and sugar. Our team at Ashario Pets recommends switching to single-ingredient freeze-dried treats or low-fat training treats for any dog managing Cushing's disease. Browse our dog treats collection and filter for low-fat, minimal-ingredient options.

What Are the Best Dog Food Types for Cushing's Disease in Canada?

The best dog food formats for Cushing's disease are those that allow precise fat control and use high-quality, named protein sources: specifically low-fat dry kibble, low-fat wet food, or lean raw formulations with a verified guaranteed analysis. The format matters less than the macronutrient profile.

Here's how each format applies to a Cushing's dog diet:

• Low-fat dry kibble — Easiest for portion control and fat tracking. Look for 8–12% fat on the guaranteed analysis. Brands like Zignature (available at Ashario Pets) offer limited-ingredient, single-protein formulas with moderate fat levels worth discussing with your vet. Browse our dry dog food collection.
• Wet / canned food — Higher moisture (70–80%) which is helpful since Cushing's dogs drink excessively and may be dehydrated. Always calculate dry matter fat, as wet food often appears lower in fat than it actually is. Explore our wet dog food collection.
• Freeze-dried and air-dried food — Excellent protein density and minimal processing, but fat content can be high in some formulations. Check the guaranteed analysis carefully. Browse our freeze-dried dog food collection.
• Raw food — Lean raw proteins (turkey, kangaroo, rabbit, bison) can work well for Cushing's dogs, but require careful fat monitoring. Brands like Big Country Raw and Red Dog Blue Kat, both Canadian brands available at Ashario Pets, offer lean formulations worth exploring with your veterinarian. See our raw dog food collection.

Pet owners in the North York and Yonge-Finch area frequently come into our store specifically asking about Cushing's-appropriate diets after a new diagnosis. When a customer comes in asking about senior dog nutrition for a dog with hyperadrenocorticism, we typically suggest starting with a single-protein, low-fat kibble while consulting their vet, then layering in supplements based on bloodwork results.

What Supplements Support Dogs with Cushing's Disease?

Targeted supplements can support dogs with Cushing's disease, but should only be introduced with veterinary guidance. The most evidence-supported additions include omega-3 fatty acids, probiotics, digestive enzymes, and antioxidants like vitamin E. Research indexed on the National Center for Biotechnology Information (NCBI) suggests omega-3 supplementation at doses of 50–80 mg EPA+DHA per kg of body weight may reduce inflammatory markers relevant to endocrine conditions.

Glucosamine and chondroitin are also worth considering: Cushing's dogs frequently develop muscle weakness and joint deterioration, and a supplement providing 500–1000 mg glucosamine daily (depending on body weight) can support joint mobility. Probiotics supporting gut microbiome diversity are valuable given that cortisol disrupts gastrointestinal function. Look for formulations with at least 1 billion CFU per serving from Lactobacillus or Bifidobacterium strains.

Brands like MOJO Pet Supplements and Canine Matrix, both available at Ashario Pets, offer targeted supplement options worth discussing with your veterinarian for Cushing's management. Visit our dog health and wellness collection to explore available supplement options.

How Do I Transition My Cushing's Dog to a New Diet Safely?

Transition a Cushing's dog to a new diet gradually over 10–14 days to minimize gastrointestinal upset. Begin with 25% new food mixed with 75% old food for the first three days, then 50/50 for days four through seven, then 75% new food for days eight through ten, and 100% new food from day eleven onward.

Dogs with Cushing's often have sensitive digestive systems due to elevated cortisol's effect on the gut lining. A slower transition (up to 21 days) is reasonable if your dog shows soft stools or vomiting at any stage. Always inform your veterinarian when changing your Cushing's dog's diet, as changes in food intake can affect medication absorption and bloodwork results. Track body weight weekly during the transition — unexplained weight loss or gain should be reported promptly.

Our nutrition experts at the North York Ashario Pets location are happy to assist you compare guaranteed analysis labels side by side before you commit to a new formula. We also carry pet test kits that some owners use to monitor general wellness markers between vet visits. For personalized advice on managing your dog's wellness, visit our dog wellness needs page or contact us directly.

Frequently Asked Questions: Cushing's Disease Dog Diet in Canada

What is the best low-fat dog food for Cushing's disease in Canada?

The best low-fat dog food for Cushing's disease in Canada has a fat content of 8–12% on a dry matter basis, uses a named single protein source, and avoids simple carbohydrates and artificial additives. Brands like Zignature, available at Ashario Pets, offer single-protein limited-ingredient formulas that are worth reviewing with your veterinarian. Always confirm a specific formula's guaranteed analysis before switching, and consult your vet to match the food to your dog's individual bloodwork and medication protocol.

Can dogs with Cushing's disease eat raw food?

Yes, dogs with Cushing's disease can eat raw food, provided the formula is lean and the fat content is carefully controlled. Lean proteins such as turkey, rabbit, and bison typically have lower fat content than beef or pork. Canadian raw brands like Big Country Raw and Red Dog Blue Kat, both carried at Ashario Pets, offer lean single-protein options. Always verify the fat percentage on a dry matter basis and discuss raw feeding with your veterinarian, particularly if your dog is on medication like trilostane or mitotane, which can affect nutrient absorption.

What carbohydrates should I avoid feeding a dog with Cushing's disease?

Dogs with Cushing's disease should avoid high-glycemic carbohydrates including white rice, white potato, corn, and wheat. These ingredients rapidly raise blood glucose and may worsen the insulin resistance that often accompanies hyperadrenocorticism. Instead, look for foods with lower-glycemic carbohydrate sources such as lentils, chickpeas, sweet potato, or oats in moderate quantities. As of 2026, many Canadian pet food brands have moved toward legume-based or potato-free formulations that are easier to adapt for dogs managing endocrine conditions. Discuss any grain-free or limited-ingredient formula with your vet given ongoing research into diet-related cardiac concerns.

How many calories should a dog with Cushing's disease eat per day?

Caloric needs for a dog with Cushing's disease depend on their current weight, target weight, activity level, and whether they are on medication that affects metabolism. A general starting point is the Resting Energy Requirement (RER): 70 × (body weight in kg)^0.75 kcal per day, then multiplied by a life-stage factor of 1.2–1.4 for a sedentary adult dog. For a 10 kg Cushing's dog, this typically works out to approximately 350–470 kcal per day. Because Cushing's dogs often gain weight due to cortisol-driven fat storage, aim for the lower end of caloric range until body condition normalizes. Your veterinarian or a veterinary nutritionist can calculate precise kcal targets based on your dog's clinical picture.

Where can I buy low-fat dog food for Cushing's disease near North York, Ontario?

Ashario Pets, located at 1111A Finch Ave W, Unit 2, North York, ON M3J 2P7, is a premium pet supply store open 7 AM to 11 PM daily, 365 days a year, and carries a wide selection of low-fat dry dog food, wet dog food, raw dog food, and supplements suitable for dogs managing Cushing's disease. Our in-store team can help you compare guaranteed analysis labels and identify formulas with appropriate fat and protein content. You can also reach us by phone at +1-647-564-4433, or shop online for delivery via Uber Eats, DoorDash, SkipTheDishes, Instacart, or Fantuan. Visit our premium pet food selection or explore our best pet food for specific needs page to get started.