Osteoarthritis (OA) affects approximately 20% of adult dogs and up to 65% of dogs over the age of 7 in Australia. It is the most common cause of chronic pain in dogs — and one of the most under-diagnosed, because dogs are stoic and owners frequently miss early signs.
Diet cannot cure arthritis. But it can meaningfully slow its progression, reduce inflammation, support joint tissue health, and — most critically — manage weight, which is the single most effective non-pharmacological intervention for arthritic dogs.
Written by Hazel, BVSc | April 2026
THE SCIENCE: WHAT NUTRIENTS ACTUALLY HELP
- Omega-3 fatty acids (EPA & DHA) — strong evidence: Multiple randomised controlled trials demonstrate that EPA and DHA supplementation reduces prostaglandin production in arthritic joints. Target: 2.5–4g EPA+DHA daily for a 25kg dog with OA. Best sources: salmon, mackerel, herring, sardine.
- Glucosamine & chondroitin — moderate evidence: Glucosamine is a precursor to glycosaminoglycans (cartilage structural components). Chondroitin attracts water into cartilage and inhibits degradative enzymes. Commercial joint foods typically contain 500–1000mg glucosamine per 1000kcal.
- Green-lipped mussel (GLM) — emerging evidence: NZ green-lipped mussel contains unique omega-3 compounds (ETA) not found in other marine oils. Three RCTs in dogs show significant improvement in OA pain scores.
- Weight management — strongest evidence: Every 1kg of excess weight creates 4–5kg of additional force on arthritic joints. Weight management is arguably more important than any specific nutrient.
QUICK PICKS: BEST JOINT-SUPPORT DOG FOODS (2026)
Hills Prescription Diet j/d
Most clinically studied joint diet for dogs. Highest omega-3 in category. Gold standard if your dog has significant arthritis. 9.5/10.
Royal Canin Mobility C2P+
Excellent joint nutrient profile, palatability optimised for senior dogs. Therapeutic glucosamine & chondroitin. 8.5/10.
Advance Joint+ Adult
Best commercially available joint food without prescription. Includes GLM — rare in OTC foods. 8.0/10.
Hills Science Diet Adult 7+
Joint nutrients and calorie control combined. Ideal for overweight arthritic dogs. 7.8/10.
Fish Oil Capsules (complementary)
The most cost-effective way to achieve therapeutic omega-3 levels. Add to any quality food. 1000mg per 10kg body weight.
Hills Prescription Diet j/d (Joint Mobility)
Hills Prescription Diet j/d is the most clinically studied joint diet for dogs, with multiple peer-reviewed trials demonstrating meaningful improvement in mobility and lameness scores. It has the highest EPA/DHA content in the category at 0.64% DM, plus therapeutic levels of glucosamine (940mg/1000kcal) and chondroitin (240mg/1000kcal). If your dog has significant arthritis, this is the gold standard dietary approach — most vets prescribe Hills j/d before considering NSAIDs.
- Most clinically studied joint diet for dogs — multiple peer-reviewed trials
- Highest EPA/DHA omega-3 content in category (0.64% DM)
- Therapeutic glucosamine (940mg/1000kcal) and chondroitin (240mg/1000kcal)
- WSAVA full compliance — the gold standard prescription approach
- Vets prescribe j/d before considering daily NSAIDs
- Requires vet prescription — not available OTC
- Premium price at ~$25–32/kg
- Not Australian-made
Royal Canin Mobility C2P+
Royal Canin Mobility C2P+ offers an excellent joint nutrient profile with glucosamine and chondroitin at therapeutic levels, plus additional joint-supportive compounds in the MC2P+ formula. Palatability is optimised for senior dogs with reduced appetite — a practical advantage when your arthritic dog is also ageing and becoming fussier about food.
- Therapeutic levels of glucosamine, chondroitin, and omega-3
- MC2P+ formula includes additional joint-supportive compounds
- Palatability optimised for senior dogs with reduced appetite
- WSAVA full compliance
- Requires vet prescription
- Expensive at ~$28/kg
- Less clinical study evidence than Hills j/d specifically
- Not Australian-made
Advance Joint+ Adult
Advance Joint+ is the best commercially available joint food in Australia without a prescription. It includes green-lipped mussel (GLM) — rare in OTC foods — along with glucosamine at 600mg/kg and moderate omega-3 levels. Good protein content and an accessible price make this the top OTC pick for dogs with mild to moderate joint concerns.
- No prescription required — available at PetBarn and Pet Circle
- Includes green-lipped mussel (GLM) — rare in OTC joint foods
- Australian-made with good protein content
- Accessible price at ~$14/kg for a therapeutic-intent food
- Joint nutrient levels lower than prescription alternatives
- Glucosamine at 600mg/kg is below therapeutic study levels
- May not be sufficient for moderate to severe OA without supplementation
Hills Science Diet Adult 7+ (Senior Formula)
For overweight arthritic dogs, the weight management component is as important as joint-specific nutrients. Hills Science Diet Adult 7+ balances these two priorities — joint nutrients and calorie control — in a single product. This makes it ideal for the many senior dogs who need to lose weight and support their joints simultaneously.
- Combines joint nutrients with calorie control in one product
- WSAVA compliant with vet nutritionist formulation
- No prescription required
- Designed specifically for the 7+ age group where arthritis is most prevalent
- Joint nutrient levels are supportive, not therapeutic — lower than Hills j/d
- Lower protein (22% DM) may not suit active dogs needing muscle mass
- Not Australian-made
Fish Oil Supplement (Complementary)
If your dog is already on a quality food, adding a fish oil supplement is the most cost-effective way to achieve therapeutic omega-3 levels for joint health. A starting point of 1000mg fish oil per 10kg body weight is commonly recommended — but confirm the exact dose with your vet. This approach lets you keep your dog on their preferred food while adding the single most evidence-based joint nutrient.
- Most cost-effective way to add therapeutic omega-3 levels
- Can be added to any existing food — no diet change needed
- EPA/DHA has the strongest evidence base for joint inflammation reduction
- Also benefits skin, coat, and cardiovascular health
- Not a complete food — supplement only
- Some dogs dislike the taste or develop fishy breath
- Must confirm dose with your vet — excessive fish oil can cause diarrhoea
THE WEIGHT-JOINTS CONNECTION: PRIORITY #1
This is the most important section on this page.
For every arthritic dog, weight management should be priority number one — ahead of glucosamine supplements, ahead of prescription food, ahead of any other intervention.
The evidence: A study in dogs found that reducing body weight by 11–18% in overweight arthritic dogs improved ground force measurements (mechanical assessment of joint pain) by 20–26%. Achieving ideal body weight often dramatically reduces the need for NSAID pain medication. Weight management is free — it costs nothing and has no side effects.
Practical approach:
- Weigh your dog (scales at most vet clinics and PetBarn)
- Assess body condition score (ideal = BCS 4–5 on 9-point scale)
- If overweight: reduce current food by 15–20%, increase gentle low-impact exercise (swimming ideal)
- Target: 1–1.5% body weight loss per week
- Recheck monthly with vet
NON-DIETARY JOINT MANAGEMENT
These interventions work synergistically with diet:
- Cartrophen injections (pentosan polysulphate): 4 injections 1 week apart, then every 3–6 months. Most cost-effective pharmacological joint treatment in AU (~$100–150/course).
- NSAIDs (Meloxicam, Carprofen): Prescription pain management for moderate-severe OA. Requires blood tests for kidney/liver monitoring.
- Hydrotherapy: Pool or underwater treadmill therapy — excellent low-impact exercise. Available in most AU capital cities.
- Physiotherapy: Certified animal physiotherapists for muscle strengthening around arthritic joints.
- Ramps: Reduce impact from jumping on/off furniture or into cars.
FAQ — Joint Health Dog Food Australia
Does glucosamine in dog food actually work?
The evidence is moderate. Glucosamine and chondroitin in dog food show beneficial effects in multiple trials, but the levels in most commercial foods are below what’s used in studies. Prescription diets (Hills j/d, RC Mobility) contain therapeutic levels. OTC foods contain lower but still potentially beneficial levels. Adding a separate joint supplement increases dosing.
What’s the best food for an old dog with arthritis?
Hills Prescription Diet j/d is the most evidence-based option if your vet recommends a prescription diet. For OTC options, Advance Joint+ is the best available. Always combine with weight management — if your dog is even slightly overweight, reducing food intake is the most important step.
Is salmon good for arthritic dogs?
Yes — salmon is rich in EPA and DHA omega-3 fatty acids, which have proven anti-inflammatory effects in arthritic joints. A salmon-based food or adding fish oil to any food provides genuine joint benefit.
My vet recommended Cartrophen injections. Should I also change the diet?
Yes — Cartrophen (pentosan polysulphate) and a joint-supportive diet work through different mechanisms and complement each other well. The combination of weight management + omega-3 diet + Cartrophen injections is a highly effective conservative protocol for moderate OA before moving to daily NSAIDs.
