If your dog has been diagnosed with polyarthritis, or your vet suspects it, you have probably wondered whether a joint supplement could help. It is a sensible question, and the honest answer has a few layers.
Polyarthritis means inflammation in several joints at once. It can have different underlying causes, so it needs a vet's diagnosis and a vet-led plan. Most research on joint supplements looks at osteoarthritis, the common wear and tear condition, rather than polyarthritis specifically. We will be clear about that throughout.
This guide covers what supplements can reasonably do, what the evidence says about common ingredients, how to judge a label, and where a product like ours fits in. A supplement sits alongside veterinary care and never in place of it.
Comparing joint supplements for a dog with polyarthritis
Polyarthritis affects more than one joint, so the ingredient list is worth reading closely. The table below compares MedPaw Hip & Joint Chews Max, our own product, with five other well-known UK joint supplements, starting with a score for key joint actives.
It counts glucosamine, chondroitin, MSM, green-lipped mussel, hyaluronic acid and Boswellia serrata, then shows format and guarantee for each product.
UK dog joint supplements compared, ingredient by ingredient
| Ingredient | MedPaw Hip & Joint Chews Max | NutraPaw Joint Support | YuMOVE Joint Support PLUS Max | Seraquin Joint | Synoquin EFA | Nutraquin+ |
|---|---|---|---|---|---|---|
| Key joint actives | 6 of 6 | 4 of 6 | 3 of 6 (+1 via mussel) | 2 of 6 | 2 of 6 | 3 of 6 |
| Glucosamine | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| Chondroitin | ✓ | ✗ | Via mussel | ✓ | ✓ | ✓ |
| MSM | ✓ | ✓ | ✗ | ✗ | ✗ | ✗ |
| Green-lipped mussel | ✓ | ✓ | ✓ | ✗ | ✗ | ✗ |
| Hyaluronic acid | ✓ | ✓ | ✓ | ✗ | ✗ | ✗ |
| Boswellia | ✓ | ✗ | ✗ | ✗ | ✗ | ✓ |
| Omega-3 | Mussel, flax | Mussel | Mussel, fish oil | ✗ | Krill oil | ✗ |
| Turmeric | ✗ | ✓ | ✗ | ✓ | ✗ | ✗ |
| Collagen | ✗ | ✓ | ✗ | ✗ | ✗ | ✗ |
| Antioxidants | Vit C, Vit E, zinc | Manganese | Vit C, Vit E, manganese | ✗ | Vit C, zinc | Vit C, zinc |
| Format | Soft chew | Tablet | Tablet | Chewable tablet | Tablet or capsule | Capsule |
| Guarantee | 60 days | 90 days | 6 weeks | Not stated | Not stated | Not stated |
✓ = included, ✗ = not listed. Key joint actives: glucosamine, chondroitin, MSM, green-lipped mussel, hyaluronic acid and Boswellia. Taken from each manufacturer's published information, September 2026.
The top row is the clearest result. MedPaw is the only one of the six products to list all six key joint actives. NutraPaw scores 4 of 6, YuMOVE and Nutraquin+ 3 of 6, and Seraquin and Synoquin EFA 2 of 6. For a dog with several joints involved, one daily chew covering that full range is a practical place to start.
MedPaw is a soft chew rather than a tablet or capsule, which many owners find easier to give every day. It also adds omega-3 from green-lipped mussel and flax seed, plus vitamins C and E and zinc. It supports joint comfort and mobility as a complementary feed, alongside your vet's plan.
Daily use for 2 to 3 months is recommended for optimal results. A 60-day money-back guarantee and Subscribe & Save are available, so you can give it a proper trial.
Explore MedPaw Hip & Joint Chews Max See the full ingredient list and feeding guide for your dog's weight on the product page.
Why a diagnosis has to come first
Swollen, stiff or sore joints can come from several different problems. Hip dysplasia, osteoarthritis and inflammatory joint conditions are often talked about as if they were the same thing, but they are not. What is going on in your dog's joints decides what kind of help makes sense.
That is why it is not a good idea to start a supplement for swollen or painful joints before a vet has worked out the cause. Your vet may want to examine your dog, run tests and agree a plan with you. Any supplement then becomes one small, optional part of that plan.
If you are already giving something, tell your vet exactly what it is. Your vet should know everything your dog takes, including any medicines, and can advise whether a supplement suits your dog alongside them.
What a joint supplement can and cannot do
Sources agree that no supplement can undo arthritis. Be wary of any label or advert that suggests a product treats or prevents it. A supplement is a complementary feed. It provides ingredients that are thought to support cartilage and, in some cases, joint comfort.
Joint supplements are often described as useful for some dogs but not all. Some owners notice a difference and some do not. Nobody can promise which group your dog will fall into, and it helps to know that before you begin.
Supplements are not regulated like medicines
Claims such as "joint support" or "mobility support" are not tightly regulated, and manufacturers do not have to prove them in the way they would for a medicine. A veterinary school source notes that products may not contain exactly what the label states, and that there is no universal agreement on the daily amount of each ingredient. An independent laboratory that tested human joint supplements found that a number of them did not meet their label claims.
None of this means every supplement is poor. It simply means the label, the manufacturer and the dosing instructions deserve a careful look.
Weight is the biggest lever
The UK arthritis charity source and the US veterinary source say the same thing: keeping a dog lean matters more than anything you can add to a bowl. Being overweight has a significant effect on comfort and on how joint problems progress. For overweight dogs, weight loss alone often brings a real improvement in comfort.
Ask your vet to score your dog's body condition and agree a target weight. It is best to do this before adding any extras.
One related point. The US source advises checking with your vet before adding fish oil to an overweight dog, because oil is high in calories. Chews and supplements count towards the daily total too, so your vet can help you balance it.
What the evidence says about common ingredients
The picture varies a lot from ingredient to ingredient. Some have more encouraging findings and some are much more debated. Here is a plain summary of what the sources say.
How the evidence looks for common joint ingredients in dogs
| Ingredient | What the sources say | Strength of support |
|---|---|---|
| Marine omega-3 (EPA and DHA) | The most supported overall. Studies showed mild but statistically significant improvement in owner-rated comfort and mobility. | More positive |
| Green-lipped mussel | Contains cartilage-type building blocks and omega-3s. Evidence of a mild to moderate positive effect, though few suitable trials exist. Extract quality and a sufficient daily amount matter. | More positive |
| Glucosamine | Mixed. A well-regarded trial found it no better than placebo, while other sources see moderate support. Questions remain about how much reaches the joint. | Debated |
| Chondroitin | Described as weak evidence in dogs by the UK source. The US source suggests it may be useful alongside glucosamine. | Debated |
| Hyaluronic acid | Shows benefits when injected into joints, but only a small share is absorbed from the gut when given by mouth. | Debated |
| Boswellia serrata | One small study reported improved clinical signs in some of the dogs involved. | Early, limited |
| Turmeric | Only one controlled dog study, with no objective difference but some improvement in subjective measures. Can interact with some medicines. | Limited, check with your vet |
For guidance only, not a diagnosis.
Willow bark has no dog studies, and the UK charity's position on CBD is that too many uncertainties remain. For MSM, the sources we reviewed offer no dog evidence, so we make no claims about it.
Herbal products need particular care. Quality control can be variable, and turmeric may not suit dogs with sensitive stomachs, liver, pancreas or gall bladder problems, or a history of urinary oxalate stones. Please speak to your vet first.
A note on omega-3 in chews
The US source points out that the omega-3 dose in chews is often modest, and some vets prefer a separate fish oil to reach a particular dose. If omega-3 matters for your dog, check the label and ask your vet whether the total intake from all sources suits them.
How to judge a supplement: the ACCLAIM checklist
Because the market is so loosely regulated, the UK arthritis charity promotes a simple checklist drawn from a veterinary textbook author. It is a handy way to compare any product, ours included.
- A: A company name you recognise. Ideally one that provides veterinary educational material.
- C: Clinical experience. Does the company invest in trials and publish its data?
- C: Content. Every ingredient should be clearly listed.
- L: Label claims. If they sound too good to be true, they probably are. Trial references count for more than testimonials, and any claim to treat, fix or prevent a condition should make you suspicious.
- A: Administration. The dose should be accurate and easy to work out for your dog's weight.
- I: A batch or lot number. This lets quality be monitored.
- M: Manufacturer information. There should be a website and a way to get in touch.
Products also differ in format and ingredients. NutraPaw Joint Support and YuMOVE Joint Support PLUS Max are tablets, Seraquin Joint is a chewable tablet, Synoquin EFA comes as a tablet or capsule, and Nutraquin+ is a capsule. Their ingredient lists differ from each other and from ours, so read each label with your vet's advice in mind. The best choice depends on your individual dog, including how easily they take it.
Where MedPaw Hip & Joint Chews Max fits
MedPaw Hip & Joint Chews Max is a daily soft chew, a complementary feed for dogs. It provides ingredients such as glucosamine, chondroitin, MSM, green-lipped mussel, hyaluronic acid and Boswellia serrata to support your dog's joint comfort as part of a wider care plan agreed with your vet.
It also contains omega-3 from green-lipped mussel and flax seed, vitamins C and E, and zinc. It is made with rapeseed oil and glycerine.
We want to be fair about the evidence. Green-lipped mussel and marine omega-3 have the more positive findings in the research we reviewed, while glucosamine, chondroitin and oral hyaluronic acid are more debated. We would rather you know that than hear a bigger promise. A supplement like ours is not a treatment for polyarthritis or any other condition, and it does not replace diagnosis or prescribed medicine.
Feeding guide
- Up to 4kg: 1 chew a day
- 5 to 17kg: 2 chews a day
- 18kg and over: 2 to 3 chews a day
- The amount is doubled for the first three weeks
We recommend daily use for 2 to 3 months, which fits the advice in the sources that any effect takes time. There is a 60-day money-back guarantee, and Subscribe & Save is available if you would like regular deliveries. Please follow the feeding guide closely, and store the chews out of reach, as you would any supplement.
Practical steps you can take at home
A supplement is only one piece of the puzzle. These steps tend to matter at least as much.
- Get the diagnosis first, then ask your vet whether a supplement suits your dog.
- Tell your vet everything your dog takes, especially if they are on anti-inflammatories, steroids or other long-term medicines.
- Keep your dog lean, with your vet's help and a target weight.
- Make the home easier. A comfortable orthopaedic bed and non-slip flooring can make a real difference, as can steady, regular exercise and any physiotherapy your vet suggests.
- Change one thing at a time where you can, so you can tell what is helping.
- Ask your vet about timing. Sources suggest supplements may be more useful earlier, but the right moment to start depends on your dog.
Tracking progress honestly
Results from joint supplements are slow, and sources suggest waiting at least 2 to 3 months before judging glucosamine or green-lipped mussel. In one omega-3 study, owners reported improvement after a few months rather than a few days.
There is another reason to track carefully. In one study, many owners reported a clear improvement in their dog's mobility while actually giving a placebo, and a number of vets were fooled in the same way. This is sometimes called the caregiver placebo effect. We all want our dogs to feel better, and that hope can colour what we see.
Apparent improvement can also come from rest, weight loss or a new bed. And months of unchanged supplementing can delay other helpful steps if the supplement is not really doing much.
A simple way to keep track
- Note how your dog manages stairs, getting up, walks and play.
- Take short videos of them rising and walking, once a fortnight or so.
- Keep a few lines in a diary, including good and bad days.
- Review it with your vet after 2 to 3 months.
When to see your vet
Polyarthritis needs veterinary care, so please do not wait and see if you are worried. This is a rough guide to how quickly to act.
How quickly to contact your vet
Raise it at your next check
You are thinking of starting a supplement, your dog takes regular medication, or your dog is carrying extra weight and finding movement harder.
Book an appointment promptly
Swelling, heat or tenderness in one or more joints, lameness that moves from leg to leg, stiffness or reluctance to move, no improvement or getting worse despite a supplement, or vomiting, diarrhoea or other changes after starting a new product.
Seek help straight away
Your dog cannot get up, will not put weight on a leg, yelps or snaps when touched, has a high temperature, is off their food, or seems very unwell. Any sudden change in mobility also needs prompt attention.
Supporting a dog with joint problems is a long game, and it is easier with your vet beside you. Get the diagnosis, keep your dog lean, make home comfortable, and give any supplement time and honest tracking. That gives you the clearest picture of what is helping your dog.
Can I give my dog a joint supplement if they have polyarthritis?
Polyarthritis needs a vet's diagnosis and a vet-led plan, so please speak to your vet before starting anything. If your vet agrees, a complementary feed such as MedPaw Hip & Joint Chews Max can sit alongside that plan to support joint comfort. A supplement is not a treatment and does not replace veterinary care or prescribed medicine.
Is there a supplement that treats immune-mediated polyarthritis?
No. Supplements are complementary feeds, not medicines, and they cannot treat or cure polyarthritis or any other condition. Most research on joint ingredients looks at osteoarthritis rather than polyarthritis, so it is worth being cautious about any product that suggests otherwise. Your vet will guide the treatment plan.
How many MedPaw chews does a 20kg dog need each day?
For dogs of 18kg and over, the label says 2 to 3 chews a day, doubled for the first three weeks. A 20kg dog is in that band, so please follow the printed feeding guide closely. There are 60 chews in a tub, and the label recommends 2 to 3 months of daily use.
How long does it take to see if a joint supplement is working?
Joint supplements work slowly, and the sources we reviewed suggest allowing at least 2 to 3 months before judging them. It helps to note how your dog manages stairs, getting up and walks, and to take short videos every fortnight or so. Review your notes with your vet, as rest, weight loss or a new bed can also change how a dog moves.
How does MedPaw compare with YuMOVE, Seraquin, Synoquin and Nutraquin+?
The products differ in format and in which ingredients they declare. MedPaw Hip & Joint Chews Max is a soft chew declaring glucosamine, chondroitin, MSM, green-lipped mussel, hyaluronic acid and Boswellia serrata in one product. The others are tablets, chewable tablets or capsules with different ingredient lists, so compare each label and ask your vet which suits your dog.
When should I see a vet rather than try a supplement?
See your vet first for swollen or hot joints, lameness that moves from leg to leg, stiffness, or any sudden, severe or one-sided lameness. Seek help straight away if your dog will not put weight on a leg, cannot get up, yelps when touched, has a high temperature or is off their food. A supplement should only be considered once your vet has found the cause.
