The best joint supplement for a dog with Legg-Calve-Perthes disease

If you are searching for a supplement for a dog with Perthes disease, you are probably feeling worried. Perhaps your young dog has started limping on a back leg and you would like something gentle to try at home. Or perhaps your dog has already had surgery and you want to support their joints for the years ahead.

Both situations are common, and this guide is written for both. The most important point comes first. Perthes is a veterinary condition, and a supplement is not a treatment for it. A joint supplement is a complementary feed that can sit alongside the plan your vet sets, never in place of it.

If your puppy or young small-breed dog has a limp that is not settling, please book a vet appointment rather than waiting to see whether a supplement helps. The sooner the hip is looked at, the sooner your dog can be comfortable again.

Choosing a joint chew for a dog with Perthes disease

Perthes usually affects small, young dogs, and once your vet has set out the plan, many owners ask what they can add at home for daily joint support. A complementary feed can sit alongside veterinary care, never in place of it.

Below is how MedPaw, our own product, compares with five well-known UK options, so you can see exactly which joint actives each one lists.

The first row of the table is the one to look at. MedPaw Hip & Joint Chews Max is the only one of the six listing all six key joint actives: glucosamine, chondroitin, MSM, green-lipped mussel, hyaluronic acid and Boswellia serrata. The nearest, NutraPaw, lists four of the six, and YuMOVE, Nutraquin+, Seraquin and Synoquin EFA list three or fewer.

For a dog with a hip that has already been through a lot, covering more of those actives in one daily product keeps the routine simple. It also adds omega-3 from green-lipped mussel and flax seed, plus vitamins C and E and zinc. Small dogs often find a soft chew easier to take than a tablet or capsule.

Feeding starts at 1 chew a day up to 4kg and 2 for 5-17kg, doubled for the first three weeks, with 2-3 months of daily use recommended for best results. There is a 60-day money-back guarantee, and Subscribe & Save is available.

See MedPaw Hip & Joint Chews Max It is a daily soft chew made to support your dog's hips, mobility and comfort alongside your vet's plan.

What Perthes disease actually is

Perthes, short for Legg-Calvé-Perthes disease, is an uncommon but painful hip condition. You may also see it called avascular or aseptic necrosis of the femoral head. That is a long name for a fairly simple problem.

The hip is a ball-and-socket joint. The ball is the top of the thigh bone (the femur), and the socket sits in the pelvis. In Perthes, the blood supply to the ball is interrupted. Without a good blood supply, the bone in the ball weakens, can die and can collapse. The joint becomes misshapen, stiff and sore.

Without treatment, the hip is likely to stay painful and may develop secondary arthritis over time. The exact cause is not fully understood. Genetics appear to play an important role, although the pattern of inheritance has not been established. Some sources also note that it can follow an injury to the leg or hip.

Which dogs are affected, and what you might notice

Perthes mostly affects young dogs of small and toy breeds while they are still growing. Signs usually appear during the first year of life, often in the months when a puppy is growing quickly. Breeds commonly named include:

• Yorkshire Terriers, West Highland White Terriers, Cairn Terriers and Jack Russell Terriers
• Miniature and Toy Poodles, Miniature Pinschers and Chihuahuas
• Papillons, Pomeranians and Bichon Frises
• Small crossbreeds

It usually affects one hip. Both hips are occasionally involved.

Signs to look out for

• A limp in a back leg that gradually gets worse
• Reluctance or refusal to put weight on the leg
• Reduced movement in the hip, or the leg seeming shorter
• The affected back leg looking thinner as muscle is lost
• Irritability, which can go hand in hand with joint pain

Some owners describe the pain as appearing suddenly, even though the changes in the hip have been building quietly for some time. If any of this sounds familiar, a vet check is the next step.

How vets diagnose Perthes

Your vet will consider your dog's age and breed, ask about the history of the limp and examine the back legs and hips. To confirm Perthes, they will need X-rays (radiographs) of the hips. In the UK these are likely to be taken under sedation or general anaesthetic, so that your dog is relaxed and positioned properly.

Early changes can be subtle, so your vet may suggest repeat X-rays. Later changes include flattening, irregularity, fragmentation and collapse of the ball of the joint. This is why a limp that comes and goes in a young dog still deserves a proper look.

What treatment usually involves

Your vet will usually recommend surgery, as it gives dogs the best chance of a comfortable, working leg. The most common operation is a femoral head and neck ostectomy, usually shortened to FHO. The damaged ball and neck are removed, and the body forms a "false joint" from fibrous tissue and surrounding muscle.

In small dogs, the hip often does not need replacing. A total hip replacement may be considered, particularly in larger dogs, and is carried out by a specialist orthopaedic surgeon. Only your vet can say which route suits your dog once they have seen the X-rays.

The outlook is often very good

This is the reassuring part. With appropriate treatment, the outlook for Perthes is generally very good. Within months, many dogs are running and playing again, and plenty recover so well that it is hard to tell they ever had a problem.

Complications are described as rare. A small number of dogs always have some limping or discomfort and may need long-term anti-inflammatory medication from their vet. Some need a second operation to remove bone spurs. Recovery varies from dog to dog, so your vet is the best person to set expectations for yours.

Where a supplement fits, and where it does not

We want to be honest about what a supplement cannot do. It cannot restore the blood supply to the hip, replace surgery or stand in for pain relief and physiotherapy. It should never be a reason to delay a vet visit.

What it can do is support everyday joint comfort and mobility as part of your dog's wider care. That matters because arthritis is a common consequence of hip problems, and dogs that have had hip trouble can be more prone to joint wear over the years. Once your vet is happy with how your dog is recovering, a joint supplement may be something to talk about for the long term.

Always ask your vet first if your dog is still growing, has recently had surgery or takes prescription medication. Check the label for age suitability too, as not every supplement is made for puppies.

Where MedPaw Hip & Joint Chews Max fits

MedPaw Hip & Joint Chews Max is a daily soft chew and a complementary feed for dogs. Its key joint actives are glucosamine, chondroitin, MSM, green-lipped mussel, hyaluronic acid and Boswellia serrata. It also contains omega-3 from green-lipped mussel and flax seed, plus vitamins C and E and zinc, and it is made with rapeseed oil and glycerine.

The feeding guide is 1 chew a day up to 4kg, 2 chews for 5 to 17kg, and 2 to 3 chews for 18kg and over. The amount is doubled for the first three weeks. We recommend daily use for 2 to 3 months, so it suits owners who can give it consistently. There is a 60-day money-back guarantee, and Subscribe & Save is available.

Because most dogs with Perthes are small and young, please talk to your vet before starting any supplement, including this one. They can tell you whether and when it is right for your dog, and they will want to know what your dog is taking.

Comparing different joint products

Joint products come in several formats, and the ingredient lists differ. Based on manufacturers' published information as of September 2026, YuMOVE Joint Support PLUS Max and NutraPaw Joint Support are tablets. Seraquin Joint is a chewable tablet and Nutraquin+ is a capsule. MedPaw is a soft chew.

Not every product lists the same ingredients. Some do not list MSM or Boswellia, for example. A sensible approach is to compare ingredient lists, formats and guarantees, and to choose something your dog will happily take every day. Your vet can help you weigh up the options.

Practical ways to help your dog at home

Much of what helps a dog with Perthes happens away from the supplement shelf. These steps matter more than any product:

• Get a limp checked. A persistent or worsening back-leg limp in a young small-breed dog should be seen by a vet, not rested at home for weeks.
• Ask about the whole plan. That means pain relief, surgery options, rehabilitation and aftercare.
• Follow aftercare exactly. Medication and controlled exercise after surgery help the false joint form properly and become as flexible as possible. No running, jumping or stairs until your vet says so.
• Do the physiotherapy. Rehabilitation helps rebuild lost muscle. Ask your vet about a referral to a qualified canine physiotherapist.
• Keep your dog lean. Extra weight puts more load on the joints. Ask your vet for a target weight and feeding plan.
• Make the home safer. Non-slip rugs on hard floors, and ramps or steps for sofas and cars, make life easier. Keep walks short and gentle on the lead, as your vet directs.
• Talk about costs early. Treatment can be expensive, so speak openly with your vet about the options.

Insurance and breeding

If you have a new puppy, consider pet insurance as soon as you bring them home, before any signs of illness appear. Pre-existing conditions are typically excluded, so cover taken out after a diagnosis may not help.

Because Perthes appears to have an inherited component, dogs diagnosed with it should not be bred from. If you bought your dog from a breeder, let them know, as it may matter for their other litters.

When to see a vet

You know your dog best, so if something feels wrong, trust that feeling and call your vet. This guide shows roughly how quickly to act.

Later in life, go back to your vet if limping or stiffness returns. Some dogs have lasting discomfort or develop bone spurs that need further treatment, and an early vet check helps keep your dog as comfortable as possible.

Supporting your dog for the long term

Perthes can feel frightening when you first hear the word, but for most dogs the story ends well. A prompt diagnosis, the right surgery, good pain relief, patient aftercare and physiotherapy do the heavy lifting.

Once your dog is back on their feet, the everyday basics help keep their joints comfortable: a healthy weight, sensible exercise, regular vet checks and, if your vet agrees, a joint supplement given consistently as directed on the pack. Keep your vet in the loop at every stage, and let them guide what comes next.