Best Supplements for Dogs: A UK Buyer's Guide (2026)
Which dog supplements are worth it, which are not, and how to choose — covering omega-3, joints, skin and coat, calming and multivitamins.
Walk into any pet shop and the supplement aisle is overwhelming. Do dogs even need supplements? Sometimes yes, sometimes no. This guide cuts through it.
Does my dog need supplements?
If your dog eats a complete, balanced diet, they are getting most of what they need. Supplements earn their place when there is a specific goal — supporting ageing joints, calming a dull or itchy coat, topping up omega-3, or smoothing out stressful events. Think of them as targeted support, not a substitute for good food.
The categories that actually matter
Omega-3 (the foundation). The single most useful supplement for most dogs. DHA and EPA support skin, coat, joints, brain and heart. Start here. See our omega-3 for dogs guide.
Joint support. For stiff or senior dogs: omega-3 plus ingredients like glucosamine and green-lipped mussel. More in joint supplements for dogs.
Skin and coat. Itching, flaking or shedding? Omega-3, biotin, vitamin E and zinc are the usual heroes. See skin and coat supplements.
Calming. For fireworks, travel and separation, natural calmers can take the edge off. See calming supplements for dogs.
Multivitamins. Useful for home-cooked or specific diets — but not automatically needed. See do dogs need vitamins.
How to choose a good supplement
- Clear, named ingredients and a weight-based feeding guide.
- Reputable manufacturing (for example food-grade or certified facilities).
- Purity — for omega-3, a clean, mercury-free source (algae beats fish on this).
- No wild claims. A supplement supports health; it does not cure disease.
Where Petjesty fits
We started with the foundation — a vegan, algae-based omega-3 that is mercury-free and fish-free — and we are expanding the range into joint, skin and coat, calming and daily multivitamin support.
Whatever you choose, introduce one supplement at a time, give it a few weeks, and check with your vet if your dog has a health condition.