If you’ve ever seen your small dog suddenly skip a step, hold up a back leg, or hop like a bunny for a few strides, you may have witnessed a common condition that affects small-breed dogs. A luxating patella in small dogs can range from mild and occasional to more serious and painful.
Understanding why this happens—and what you can do about it—can help keep your dog comfortable, active, and happy.
What Is a Luxating Patella?
The patella (kneecap) sits in a groove at the end of the femur (thigh bone). In a healthy knee, it glides smoothly as your dog bends and straightens their leg.
A luxating patella occurs when the kneecap slips out of that groove—usually toward the inside of the leg (medial luxation). When this happens, your dog may briefly lose normal function of the leg until the patella returns to place.
Why Small Dogs Are More Prone
Luxating patellas are especially common in small and toy breeds like Chihuahuas, Pomeranians, Yorkshire Terriers, and Toy Poodles. There are a few key reasons why:
- Genetics and Breeding: Many small dogs are genetically predisposed to shallow femoral grooves or misaligned leg structures, which can make it easier for the kneecap to slip out of place.
- Bone and Joint Alignment: In small breeds, the alignment of the hip, femur, tibia, and kneecap may not form a perfectly straight line. Even subtle deviations can increase the risk of luxation.
- Shallow Knee Groove: A naturally shallow groove means the patella has less stability and can slide out more easily during movement.
- Ligament and Muscle Imbalances: Soft tissue support around the knee may not hold the patella securely in place, especially if muscles are underdeveloped.
- Body Size and Structure: Small dogs often have delicate bone structures, which can make their joints more susceptible to instability over time.
Signs to Watch For
Luxating patellas in small dogs can present in different ways depending on severity. Some dogs show very subtle signs, while others may have ongoing discomfort.
- Skipping or hopping on a back leg
- Sudden lameness that resolves quickly
- Holding one leg up for a few steps
- Difficulty jumping or climbing stairs
- Stiffness or reluctance to exercise
- A “bow-legged” appearance in more advanced cases
If you notice any of these signs, it’s worth having your dog evaluated—even if the issue seems minor or intermittent.
How Serious Is It?
Veterinarians grade luxating patellas on a scale from I to IV:
- Grade I: Mild, occasional luxation with minimal symptoms
- Grade II: More frequent luxation; may cause intermittent limping
- Grade III: Patella is often out of place and may require manual repositioning
- Grade IV: Patella is permanently out of place; often causes significant mobility issues
Over time, even mild cases can lead to arthritis or worsening joint damage if left unmanaged.
Diagnosis and Evaluation
A veterinarian can often diagnose a luxating patella during a physical exam by gently manipulating the knee. In some cases, X-rays may be recommended to evaluate bone structure and rule out additional concerns.
At Union Lake Veterinary Hospital, we focus on early detection and personalized care plans to help prevent progression and maintain your dog’s quality of life.
Treatment Options
Treatment depends on the severity of the condition and how much it impacts your dog’s daily life.
Conservative Management (Mild Cases)
For lower-grade luxations, non-surgical approaches may be effective:
- Weight management to reduce joint stress
- Joint supplements (glucosamine, chondroitin, omega-3s)
- Controlled exercise to build muscle support
- Physical rehabilitation and strengthening exercises
- Pain management or anti-inflammatory medications when needed
Surgical Treatment (Moderate to Severe Cases)
In more advanced cases, surgery may be recommended to correct the alignment and stabilize the kneecap. This can significantly improve comfort and long-term mobility.
If your pet needs advanced care, our team can guide you through the next steps and coordinate with specialists as needed.
Preventing Future Problems
While you can’t change your dog’s genetics, there are steps you can take to reduce the risk of progression:
- Maintain a healthy weight
- Avoid excessive jumping on and off furniture
- Use ramps or pet stairs when possible
- Keep your dog active with appropriate, low-impact exercise
- Schedule regular veterinary check-ups
Additional ULVH Resources:
- Why Your Dog is Limping
- Small Dog Problems
- Signs Your Dog May Have a Luxating Patella — and When to See a Vet
When to Call Your Veterinarian
If your small dog is showing signs of limping, skipping, or changes in mobility, don’t wait. Early intervention can significantly reduce the risk of long-term joint damage and discomfort.
At Union Lake Veterinary Hospital, we’re here to support your pet through every stage of life—from playful puppyhood to comfortable senior years. If you have concerns about your dog’s mobility or joint health, our team is always happy to help.