You bought a pack of Johnson's 4Joints and gave it to your dog every day, but nothing seems to have changed. They still pause at the bottom of the stairs and still take a while to get going after a nap. You may be wondering whether you wasted your money, or whether something else is going on.
That frustration is very common, and it is rarely as simple as "this product does not work". Joint supplements are slow, subtle and easy to judge unfairly. Stiffness in a dog can also have several causes that a supplement was never going to address on its own.
This guide walks through the most likely reasons a joint supplement can feel as though it is doing nothing, and how to give any product a fair trial. It also covers when to stop guessing and speak to your vet.
Checking your next joint supplement against six key actives
If a joint supplement seems to be making little difference, one useful step is to look closely at what is in the tub, as well as how long and how much you have been giving.
The table below compares popular UK joint supplements across six key actives, including MedPaw Hip & Joint Chews Max, which is our own product. Johnson's 4Joints is not in it, so use the same six-active checklist on your own pack.
MedPaw is the only one of the six with all six key joint actives
| 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 first row tells the story. MedPaw is the only one of the six with all six key joint actives: glucosamine, chondroitin, MSM, green-lipped mussel, hyaluronic acid and Boswellia serrata. The others list between two and four. For a dog who still hesitates at the stairs, covering all six in one daily chew is a sensible next step.
It also helps you give a supplement a fair trial. The feeding guide doubles the daily amount for the first three weeks, then 2-3 months of daily use is recommended for optimal results. MedPaw supports joints, mobility and comfort alongside veterinary care, and comes with a 60-day money-back guarantee and Subscribe & Save.
Meet MedPaw Hip & Joint Chews Max See the full ingredients and feeding guide for the soft daily chew that brings all six key joint actives together.
What we know about Johnson's 4Joints
It helps to be clear about what the product is. From the information we reviewed, Johnson's 4Joints is sold as a tablet in a 30-tablet pack. It is described as an extra strength nutritional supplement for the maintenance of flexibility and mobility in joints. It is marketed for older cats and dogs rather than for dogs alone.
The named ingredients are glucosamine, chondroitin, omega 3, green-lipped mussel and a range of vitamins. The information we reviewed did not list MSM, hyaluronic acid or Boswellia. That is not the same as saying they are absent, so check the current pack if it matters to you.
We have not seen the ingredient amounts, which vitamins are included, the feeding guide by weight, or how long the manufacturer suggests giving it before you judge it. We will not guess at those. Your pack and the manufacturer's current information are the right place to look.
What a joint supplement can and cannot do
Look at the wording Johnson's uses: maintenance of flexibility and mobility. That is a modest and honest description, and it applies to joint supplements in general. They are complementary feeds that support joints and mobility alongside veterinary care. They are not a treatment, and they will not be the whole answer for a dog with a joint problem.
A supplement can be one helpful part of a routine that also includes a healthy weight, sensible exercise and a comfortable home. If the cause of your dog's stiffness has never been diagnosed, a supplement alone is unlikely to make a visible difference.
Common reasons a supplement can feel like it is not working
None of these are claims about any single product. They are practical things worth checking before you decide a supplement has had a fair go.
Common reasons a joint supplement may seem to make no difference
| Possible reason | What it can look like | What to try |
|---|---|---|
| Not enough time | Stopping after a few days or a single pack | Allow several weeks of daily use and note changes |
| Dose not matched to weight | Guessing the dog's weight, especially with larger dogs | Weigh your dog and re-read the pack guidance |
| Inconsistent use | Missed days, tablets spat out or left in the bowl | Give at the same time daily and watch it is swallowed |
| Gradual change missed | Small improvements that are hard to spot day to day | Keep notes and short videos |
| Cause not diagnosed | Stiffness, limping or slowing down with no clear reason | Book a vet check |
| Needs have changed | Weight gain, more activity or advancing age | Review the whole routine with your vet |
| Product fit | Format or ingredients that do not suit your dog | Discuss alternatives with your vet |
For guidance only, not a diagnosis.
Time is the big one
Joint supplements are generally given every day over weeks, not days. Many owners judge too early, and some stop after the first pack. A 30-tablet pack lasts a month or less, depending on how many tablets your dog needs each day, so a single pack may not be a long enough trial. Check the feeding guide on your pack for your dog's weight.
Dose and consistency
Under-feeding is easy to do, particularly with bigger dogs, because the amount usually rises with body weight. Weigh your dog rather than estimating, then compare the figure with the label.
Consistency matters just as much. Tablets can be harder to give to fussy dogs, and a tablet that is dropped, spat out or left in the bowl means your dog has not had it. Hiding one in a small portion of food can help, and your vet or pharmacist can suggest suitable ways to give it.
Changes can be easy to miss
Mobility tends to change gradually, if it changes at all. You see your dog every day, so small shifts are hard to notice. Looking back over several weeks of notes or videos often tells a clearer story than memory does.
The cause may need more than a supplement
Stiffness, limping or slowing down can come from arthritis, hip or elbow problems, a cruciate injury, or back or neck pain. They can also come from conditions that have nothing to do with the joints. Only a vet can tell you which it is. If your dog has not had a proper examination, that is often the most useful next step.
A fair way to judge any joint supplement
Whichever product you use, a simple routine makes the result much easier to read. Aim for roughly two to three months of consistent use before drawing firm conclusions, unless your pack or your vet says otherwise.
- Note the starting point. Write down how your dog gets up, how they manage stairs, how long their walks are and how stiff they are after rest.
- Follow the label exactly. Use the right amount for your dog's weight, every day, with food if the pack allows.
- Record progress. A short weekly note and a quick video at the start and every few weeks are more reliable than gut feeling.
- Review with your vet. Share your notes before you change or add anything.
If you see no change at all after a proper trial, that is useful information to take to your vet. It does not mean you did anything wrong.
Supporting your dog beyond the supplement
For most dogs with stiff joints, the everyday basics matter a great deal. A supplement sits alongside them rather than replacing them.
Weight and food
Extra weight puts extra load on joints. Ask your vet to confirm your dog's ideal body condition and suggest a feeding plan. Remember to count treats and chews in the daily allowance.
Exercise that suits stiff joints
Short, regular lead walks usually suit a stiff dog better than the occasional long outing or enthusiastic ball chasing. Try to avoid repeated jumping and sudden twisting. A gentle walk before play and a calm finish afterwards work as a warm-up and cool-down.
A comfortable home
- Non-slip rugs or runners on hard floors
- A supportive orthopaedic bed in a warm, draught-free spot
- Ramps or steps for the sofa and the car
- Regular nail trims, as overgrown nails can change how a dog stands and moves
Physiotherapy
Many vets can refer you to a qualified canine physiotherapist or hydrotherapy provider. Targeted exercises and guided movement can help your dog feel more comfortable day to day.
Pain relief belongs with your vet
If your dog seems uncomfortable, they may need veterinary-prescribed options, and a supplement is not a substitute for those. Please never give human painkillers to your dog, because some are dangerous to dogs. Only your vet should advise on pain relief.
Tell your vet about every supplement and medicine your dog takes, so they can see the full picture. If your dog is on prescribed medication, check with your vet before adding any new supplement.
When to stop guessing and call the vet
A supplement is not a replacement for a check-up. These signs are worth acting on, and some need quick attention.
How quickly to seek veterinary advice
Slowing down gradually
Slightly slower on walks or a little stiff after rest. Mention it at your next vet visit, and start keeping notes.
Signs that persist or worsen
Limping for more than a day or two, reluctance to use stairs, to jump into the car or to get up from bed, stiffness that is worsening, licking or chewing at a joint, muscle loss in the back legs, a bunny-hopping gait, withdrawn or irritable behaviour, restlessness at night, or changes in eating, drinking or weight. Book a vet appointment.
Seek same-day help
Your dog suddenly cannot use a leg, cannot stand, drags their back legs, cries out or seems in severe pain, or has a hot, swollen joint after an injury.
A dog who yelps, flinches when touched or picked up, or has swelling or heat around a joint should be seen promptly, even if they are otherwise bright.
If you want to look at a different format
Supplements differ in their ingredients, format and feeding guidance, and dogs respond differently. If your dog struggles with tablets, or you would like to compare ingredient lists with your vet, a different product may suit your routine better. We cannot promise any product will work where another has not, and none of them replaces a diagnosis.
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, vitamins C and E, and zinc, and it is made with rapeseed oil and glycerine.
Compared with Johnson's 4Joints, the formats differ: a soft chew versus a tablet. For a dog who dislikes tablets, a chew may be easier to give, though that depends on the individual dog. On ingredients, both list glucosamine, chondroitin, green-lipped mussel and omega-3. MedPaw also includes MSM, hyaluronic acid and Boswellia, which were not listed in the Johnson's information we reviewed.
Feeding and trial period
- Feeding guide: 1 chew a day up to 4kg, 2 for 5-17kg, and 2-3 for 18kg and over.
- First three weeks: the daily amount is doubled.
- Time: 2-3 months of daily use is recommended.
- Peace of mind: there is a 60-day money-back guarantee, and Subscribe & Save is available.
Other UK joint supplements vary too, from tablets and chewable tablets to capsules, with different ingredient lists. Each manufacturer's published information is the best place to check the details, and your vet can help you weigh them up for your dog.
Bringing it all together
If Johnson's 4Joints has not seemed to help, it is worth asking a few gentle questions before giving up. Has your dog had it long enough, at the right amount for their weight, every day? Have you recorded how they are really doing? And has a vet looked at what is behind the stiffness?
A supplement can be one supportive piece of your dog's care, working alongside a healthy weight, steady exercise, a comfortable home and regular veterinary advice. Your vet is the right person to diagnose the cause of any mobility problem and guide what comes next, so take your notes and your questions along.
How long does Johnson's 4Joints take to work?
There is no set timeframe we can quote, because the manufacturer's current guidance on this was not part of the information we reviewed. Joint supplements are generally given daily over several weeks rather than days, and many owners judge too early. Check the timeframe on your pack, keep notes or short videos, and speak to your vet if you are unsure.
Could I be giving my dog the wrong amount of Johnson's 4Joints?
It is possible, particularly with larger dogs, because the amount on a feeding guide usually rises with body weight. Weigh your dog rather than estimating, then compare the figure with the feeding guide on your pack. Also check the tablet has actually been swallowed, as tablets can be dropped or spat out.
My dog is still stiff after a month on a joint supplement. Should I see the vet?
Yes, it is worth booking a check. Stiffness, limping or slowing down can have several causes, and only a vet can tell you which one applies to your dog. A supplement is a complementary feed that supports joints and mobility, and it does not replace a diagnosis or veterinary care. Take your notes and videos along, as they help your vet see the full picture.
What is the difference between Johnson's 4Joints and MedPaw Hip & Joint Chews Max?
The main difference is format. Johnson's 4Joints is a tablet, whereas MedPaw is a daily soft chew. On declared ingredients, MedPaw lists glucosamine, chondroitin, MSM, green-lipped mussel, hyaluronic acid and Boswellia serrata, while the Johnson's information we reviewed named glucosamine, chondroitin, omega 3, green-lipped mussel and vitamins. Check the current pack or manufacturer page for Johnson's full details, as we have not seen its amounts.
How many MedPaw chews would a 20kg dog have each day?
For dogs of 18kg and over, the label says 2-3 chews a day, and the amount is doubled for the first three weeks. The label recommends 2-3 months of daily use. Please follow the printed label on your tub, and ask your vet if you are unsure about the right amount for your dog.
Is it safe to switch joint supplements, and should I tell my vet?
It is sensible to mention any change to your vet before you make it, especially if your dog is on prescribed medication or has a health condition. Tell them about every supplement and medicine your dog takes so they can see the whole picture. A supplement supports your dog's routine alongside veterinary care, and it never replaces a medicine or treatment your vet has prescribed.
