Joint supplements for dogs: do they work?
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Joint supplements are one of the fastest-growing things owners buy for their dogs, especially as they get older. Some have reasonable evidence behind them; others much less. Here's a plain-English summary.
Start with your vet
Stiffness, slowing down on walks or reluctance to jump can be signs of arthritis — but also of other problems. Supplements can support a treatment plan; they don't replace pain relief your vet prescribes. Keeping your dog slim is one of the most effective things you can do for their joints.
What the evidence says
| Ingredient | Evidence in dogs |
|---|---|
| Omega-3 fish oils (EPA and DHA) | The strongest support. In one study, dogs with osteoarthritis fed extra omega-3 needed less anti-inflammatory medication. |
| Glucosamine and chondroitin | Mixed. Some trials show improvement after several weeks; others show little. They work slowly, if at all. |
| Green-lipped mussel | Some positive results, but not consistent across studies. |
| Turmeric (curcumin) | Weak — standard extracts are poorly absorbed by dogs. |
Summary based on dvm360: joint supplements, the helpful vs the hype.
Choosing a supplement
- Check the dose of active ingredients, not just the list — especially EPA and DHA for fish oils.
- Look for products made for dogs. Human supplements can contain ingredients that aren't safe for dogs, such as xylitol.
- Give it time. Most need 6–10 weeks before you'd expect to see a difference.
- Tell your vet what you're giving, especially if your dog is on other medication.
What it costs
Most dog joint supplements cost somewhere between a few pounds and £30+ a month, depending on the ingredients and your dog's size. Compare the cost per day at your dog's dose, not the price of the tub — the same idea as comparing food by cost per day.
Other ways to help stiff joints
- A supportive, orthopaedic-style bed away from draughts.
- Shorter, more frequent walks instead of one long one.
- Rugs on slippery floors and a ramp for the car.
More on older dogs: caring for a senior dog.
General information only, not veterinary advice. If you're worried about your dog's health, speak to your vet.
Last updated September 2026.