Quick Answer: Luxating patella happens when your dog's kneecap slides out of its groove, causing a skipping gait or temporary lameness. It's graded on a scale of I to IV, with many dogs managing well through conservative care. Supplements like Mobility & Joints can support the structures around the knee, though surgery may be needed for severe cases.
You watch your dog trotting along the garden path. Their back leg suddenly gives way, and they skip a stride. Then they keep walking. No yelp. No panic. Just a brief moment where something didn't feel right.
It happens again tomorrow. This time you see it clearly: their back leg came up sharply for one step, and then they were fine. Normal gait. No sign of pain. You start wondering if you imagined it.
If this sounds familiar, your dog might have luxating patella. It's the most common orthopaedic condition in small dogs, though larger breeds get it too. And here's the reassuring bit: most dogs live completely normal, active lives with this condition.
What Is Luxating Patella?
Your dog's kneecap (the patella) sits in a groove at the end of the thighbone. This groove keeps it in place as the leg bends and straightens. With luxating patella, the kneecap slides out of that groove, usually towards the inside of the leg. Then it pops back in on its own.
The fancy term is patella luxation. The practical meaning: a slipped kneecap that causes a temporary skip or hop in your dog's gait.
Vets use the Orthopaedic Foundation for Animals (OFA) grading system to classify severity. Understanding these grades helps you know what to expect and what your vet might recommend.
The Four Grades of Patella Luxation
Grade I: The kneecap slides out only occasionally, usually with full leg extension. Your dog shows no lameness or pain. This is often found by accident during a routine check. Many Grade I cases need no treatment at all.
Grade II: The kneecap luxates more frequently, sometimes triggered by movement, sometimes spontaneously. Your dog might show a skip or brief lameness, then walk normally again. Many Grade II cases respond well to conservative management with rest, weight management, and supplements.
Grade III: The kneecap luxates most of the time. Your dog may carry the leg or skip regularly. Pain and inflammation become more likely. Surgery is often considered at this stage to improve comfort and prevent long-term damage to the joint.
Grade IV: The kneecap remains luxated permanently, unable to return to the groove. The bone structure has changed to accommodate this. Your dog may be unable to extend the leg fully. Surgery is usually recommended to restore function and quality of life.
The good news: most dogs are diagnosed at Grades I or II, where conservative management works well.
Which Breeds Are Affected
Luxating patella is incredibly common in small breeds. Chihuahuas, Yorkshire Terriers, Pomeranians, and Bichon Frises top the list. Other small dogs like Maltese, Japanese Chin, and Toy Poodles are also frequently affected.
But don't assume it's only a small dog problem. Larger breeds including Labrador Retrievers, German Shepherds, and other sporting dogs do develop luxating patella, particularly Grade IV medial luxation.
Genetics play a major role. If both parents carry the trait, their puppies are at higher risk. Responsible breeders screen for this condition and avoid breeding affected dogs.
Signs Your Dog Might Have It
The classic sign is the skip or hop you see on the back leg. Your dog picks up the leg for one or two steps, then puts it down and walks normally. They show no pain during or after these episodes.
You might also notice your dog running with their back legs slightly turned inward, or sitting with one hind leg extended out to the side. Some dogs hold a back leg up while walking, then lower it and continue normally.
In mild cases, you may see nothing at all. Your vet might discover Grade I luxation during a routine physical exam.
In severe cases, your dog might be reluctant to jump, struggle getting up from lying down, or show persistent lameness. Watch for swelling around the knee or signs that movement bothers them.
Conservative Management for Grades I and II
Most dogs with Grade I and II luxating patella do brilliantly without surgery. Your vet will recommend a combination of strategies to keep your dog comfortable and stable.
Weight management: Extra weight puts additional stress on the knee joint. Keeping your dog lean and fit protects the joint and reduces inflammation. This is often the single most important factor in managing mild to moderate cases.
Low-impact exercise: Short walks, swimming, and controlled play are ideal. Avoid jumping, intense agility, or rough-and-tumble games that stress the knee repeatedly. This doesn't mean keeping your dog still: appropriate activity keeps surrounding muscles strong.
Joint support through supplements: This is where Mobility & Joints becomes genuinely useful. It contains hydrolysed collagen peptides (the building blocks your dog's joint cartilage and connective tissue are made from), plus glucosamine, hyaluronic acid, and vitamin C. These work together to support the structures that stabilise the kneecap and protect the joint. Follow the serving guide on the pouch based on your dog's weight.
Anti-inflammatory support when needed: Your vet might recommend joint supplements during flare-ups or after more active days. Some owners find Beef Bone Broth helpful for this, given its collagen content and general joint-supporting properties.
Supplements support joint health but don't replace veterinary treatment. They're part of the picture, not the whole picture.
When Surgery Becomes the Better Option
Grade III and IV cases often benefit from surgical intervention. Several procedures exist, depending on what's causing the luxation: deepening the groove, correcting bone alignment, or tightening the soft tissue structures that should hold the kneecap in place.
Your vet will discuss which approach suits your dog's specific situation. Success rates are good, with most dogs returning to normal activity and pain-free movement after recovery.
Even after surgery, supplements and weight management remain important. Your dog's joint is supporting them for life, and ongoing care prevents secondary problems.
What Results Can You Expect?
With conservative management, most Grade I and II dogs live completely normal lives. They play, run, and jump without limitation. The skipping might happen once a month or once a year. It causes no pain and requires no intervention.
Some owners never see another episode after starting joint supplements and weight management. Others see occasional skipping that never progresses. Both are excellent outcomes.
Grade III and IV dogs typically improve dramatically after surgery. Within weeks, they're back to normal activity. The risk of arthritis developing later is reduced when the kneecap stays in the correct position.
The long-term goal is simple: a comfortable dog who can do the things that make them happy. Whether that's achieved through conservative care or surgery, both paths lead there.
Frequently Asked Questions
Can luxating patella get worse over time? Yes, in some dogs. Grades I and II can progress to III or IV, though many never progress at all. Regular vet check-ups and consistent joint care slow progression and catch changes early.
Is it painful? Grade I is not painful. Grade II may cause occasional discomfort. Grades III and IV typically involve pain, especially during or after activity. Pain is one reason surgery is recommended for severe cases.
Can my dog play normally with luxating patella? Yes, especially Grades I and II. Most dogs live active, happy lives. Avoid high-impact activities like jumping from furniture or intense agility, but regular exercise and play are fine.
Does weight really make a difference? Absolutely. Extra weight accelerates joint wear and increases inflammation. Keeping your dog lean is one of the most powerful tools you have.
How much collagen should my dog take? Follow the serving guide on the product pouch based on your dog's weight. Never guess at dosing. The pouch tells you what's right for your individual dog.
Will supplements prevent luxating patella? No, because it's a structural issue determined by genetics and bone development. Supplements support the joint and surrounding tissues, which helps manage the condition, but they don't change bone structure.
Should I breed from my dog if they have luxating patella? No. This condition is heritable, and breeding an affected dog contributes to genetic problems in future generations. Responsible breeders screen for and avoid breeding affected dogs.
Which Product for Your Dog?
If your dog has luxating patella and needs targeted joint support, Mobility & Joints (£34.99) is the natural choice. It combines 2,500mg collagen peptides with glucosamine, hyaluronic acid, manganese, and vitamins C and E. Every ingredient works together to support the knee joint and surrounding structures.
Pure Collagen (£31.99) works too if you prefer a single-ingredient approach. At 6,000mg of hydrolysed bovine collagen, it provides substantial building blocks for connective tissue and cartilage. It's tasteless and odourless, so it mixes into any food.
Beef Bone Broth (£24.99) at 40 percent collagen content offers a food-based approach many dogs love. It's warming, tasty, and supports joint health alongside other benefits. Some owners use it as an occasional joint boost rather than daily supplementation.
Start with one product and give it 8 to 12 weeks before assessing results. Watch for improved mobility, fewer episodes of skipping, or better willingness to move. Everyone's dog is different, so what works brilliantly for one might need adjustment for another.
Sources
Orthopaedic Foundation for Animals (OFA). Patella Luxation Grading System.
The Kennel Club. Canine Health Information. Patellar Luxation in Dogs.
British Veterinary Association (BVA). Guidelines on the Diagnosis of Patella Luxation in Dogs.
Disclaimer: This information is for educational purposes and doesn't replace veterinary advice. If your dog is skipping on their back leg, holding a leg up, or showing signs of lameness, consult your vet for proper diagnosis and grading. Early intervention gives the best outcomes.
Last Updated: July
2026
