---
title: "Luxating Patella in Dogs: Signs, Grades 1 to 4, Treatment and When to See a Vet | DogServ"
description: "Dog skipping on a back leg? Signs of a luxating patella, what grades 1 to 4 mean, when to book a vet, treatment options, surgery cost examples and insurance."
url: "https://dogserv.com/luxating-patella-in-dogs/"
lang: "en"
published: "2026-09-28"
image: "https://dogserv.com/og/blog-luxating-patella-in-dogs.jpg"
alternates:
  es: "https://dogserv.com/es/luxacion-de-rotula-en-perros.md"
---

# Luxating Patella in Dogs: Signs, Grades 1 to 4, Treatment and When to See a Vet

By [Cal Hewitt](https://dogserv.com/authors/calvin-hewitt/) · Published September 28, 2026

![Orange Pomeranian standing on all four legs on a non-slip rug in a living room, alert and comfortable](https://dogserv.com/blog/luxating-patella-in-dogs/featured.jpg)

A luxating patella is a kneecap that slips out of the groove where it normally rides in a dog's knee. The classic sign is a dog that suddenly skips or carries a back leg for a few steps and then walks normally again.

Veterinarians grade the condition from 1 to 4. Mild, symptom-free cases may be monitored, while persistent lameness, worsening signs and many grade 2 to 4 cases lead to a discussion about surgery. A veterinary examination is needed to assign the grade and decide whether X-rays or treatment are appropriate.

### Key takeaways

- A luxating patella is a kneecap that slips out of its groove; skipping on a back leg for a few steps is the classic sign.
- Vets grade it from 1 to 4, and only an exam can tell you which grade your dog has.
- Mild cases without signs are usually watched; persistent lameness or worsening signs lead to a surgery talk.
- Weight control, controlled exercise and vet-directed rehab help comfort but do not fix the anatomy.
- Never push the kneecap back yourself; film an episode and take the video to your vet.

## A skipping back leg: when should you book a vet visit?

If your dog skips or hops on a back leg and then looks fine, I would still book a veterinary evaluation. A one-off hop after a slippery floor may mean little, but repeated skipping is exactly what a vet wants to hear about. [Merck Veterinary Manual](https://www.merckvetmanual.com/musculoskeletal-system/arthropathies-and-related-disorders-in-small-animals/patellar-luxation-in-dogs-and-cats) describes intermittent skipping or carrying a hind leg as a recognized sign of a kneecap that moves out of place and returns.

Go sooner if the leg suddenly will not bear weight, the lameness does not go away, your dog cannot stand, or the pain looks marked. Those signs call for prompt veterinary assessment. If it is after hours, you can look through our [emergency vet listings](https://dogserv.com/directory/vets/), and for a routine exam you can find a [veterinarian near you](https://dogserv.com/directory/vets/). For limping in general, start with [why your dog may be limping](https://dogserv.com/why-is-my-dog-limping/), then come back here for the kneecap specifics.

## What is a luxating patella, and why does it happen?

The patella is the kneecap, a small bone that sits inside a tendon above the knee. Normally it slides up and down through a groove at the end of the thigh bone (the femur). In patellar luxation it moves out of that groove, either toward the inside of the leg (medial) or toward the outside (lateral).

[Merck](https://www.merckvetmanual.com/musculoskeletal-system/arthropathies-and-related-disorders-in-small-animals/patellar-luxation-in-dogs-and-cats) describes it mainly as a developmental orthopedic problem, meaning the hip, thigh bone, shin bone, groove and the soft tissues around them did not line up the way they should as the dog grew. Genetics matter, and an injury can also cause it. [Cornell's Riney Canine Health Center](https://www.vet.cornell.edu/departments-centers-and-institutes/riney-canine-health-center/canine-health-information/patellar-luxation) says it can affect one knee or both.

Which dogs get it? Medial luxation is common in small and miniature dogs, and Merck names Toy Poodles, Yorkshire Terriers, Chihuahuas and Pomeranians among them. Lateral luxation is less common and shows up more in large dogs, so a big dog with a skipping leg is not off the hook. Dogs of any age can be affected, though signs often begin before a dog turns 1.

![Young fawn Chihuahua standing on a wood hallway floor beside a white baby gate, alert and relaxed](https://dogserv.com/blog/luxating-patella-in-dogs/what-it-is.jpg)

## What signs should you watch for, and does it hurt?

Signs vary a lot from dog to dog. According to Merck, [VCA Animal Hospitals](https://vcahospitals.com/know-your-pet/luxating-patella-in-dogs) and Cornell, these are the ones to look for:

- Sudden skipping or hopping on a back leg, sometimes for several steps.
- A dog that kicks or shakes the leg out and then walks normally, which may be the dog moving the kneecap back.
- Lameness in a back leg that comes and goes, or stays.
- A crouched, flexed back-leg posture in severe grade 4 disease.
- Trouble standing when both knees are badly affected.

An oddly seated posture or reluctance to jump can also show up, but those signs are less specific, and a vet has to sort out what is behind them.

Does it hurt? It can. Mild cases may show few or no signs, so pain varies. Repeated luxation can wear on soft tissue and cartilage, and ongoing disease can lead to arthritis, less mobility and joint pain. A luxating patella also makes the knee more likely to suffer other injuries, including a torn cranial cruciate ligament. That is why a dog who looks fine between skips still deserves an exam.

## What are grades 1 to 4, and how does a vet decide?

Your vet assigns the grade by feeling the knee and seeing how the kneecap moves. The grade describes how far the kneecap slips and whether it can be put back; it does not measure your dog's pain on its own. [Merck](https://www.merckvetmanual.com/musculoskeletal-system/arthropathies-and-related-disorders-in-small-animals/patellar-luxation-in-dogs-and-cats) and VCA describe the grades this way:

Luxating patella grades in plain language

| Grade | What the vet finds |
| --- | --- |
| GradeGrade 1 | What the vet findsThe kneecap sits in the groove but can be pushed out, and it returns when the pressure is released. Signs may be mild, rare or absent. |
| GradeGrade 2 | What the vet findsThe kneecap slips out on its own or with manipulation and may stay out for a while. It returns when the leg is extended or the vet moves it. Intermittent skipping is common. |
| GradeGrade 3 | What the vet findsThe kneecap is out most of the time but can be put back by hand, and it slips out again easily. Lameness is more consistent and bone deformity may be present. |
| GradeGrade 4 | What the vet findsThe kneecap is permanently out and cannot be put back by hand. Lameness and limb deformity are severe, and the dog may walk with crouched, flexed back legs. |

Diagnosis starts with your dog's history and a hands-on exam. X-rays can show limb alignment, bone changes, other joint problems and damage from injury. Cornell says CT or MRI may be used in selected cases.

If the problem goes untreated or keeps progressing, the kneecap may slip more often, and cartilage wear, arthritis, reduced mobility, persistent lameness, limb deformity and cruciate ligament injury become more likely. A grade 1 knee does not always march up to grade 4, though. Progression is possible, not guaranteed.

![Apricot miniature poodle walking evenly across a non-slip runner in a bright living room](https://dogserv.com/blog/luxating-patella-in-dogs/grades.jpg)

## Monitoring or surgery: when is each discussed?

The grade alone does not decide this. The [American College of Veterinary Surgeons](https://www.acvs.org/small-animal/patellar-luxations/) says kneecaps that slip without causing signs, especially in small dogs, generally should be monitored rather than operated on automatically. It says surgery is most often considered at grade 2 and above, and that clinical signs matter.

Merck says conservative management is generally reserved for grade 1, some grade 2 cases with little or no lameness, older dogs, and dogs who cannot have surgery. It says surgery is typically recommended for grades 2 to 4 when lameness is marked or signs are getting worse. Cornell likewise lists surgery for advanced luxation or persistent lameness.

So, what does your vet weigh? Lameness, how often the kneecap slips, whether things are progressing, the shape of the leg, your dog's age and overall health. If surgery comes up, a second opinion from a veterinary orthopedic surgeon is a reasonable thing to ask about.

## What can conservative care do, and what can it not do?

Conservative care means managing the knee without an operation. It can include:

- Keeping your dog at an ideal body weight.
- Controlled exercise rather than sudden, hard activity.
- Veterinary physical rehabilitation.
- Pain management directed by your vet.
- Joint supplements, with the evidence discussed cautiously. Our [glucosamine guide](https://dogserv.com/glucosamine-for-dogs/) covers what that evidence can and cannot tell you.

This care can improve comfort and function, but it does not correct the underlying anatomy. Exercise will not realign the knee.

[AAHA](https://www.aaha.org/resources/what-is-veterinary-physical-rehabilitation/) describes rehabilitation as individualized, and it may include therapeutic exercise, range-of-motion work, hydrotherapy and massage. Controlled swimming or underwater treadmill work may suit some dogs, but only when a veterinary rehabilitation professional says so. Please do not invent your own exercise program. Your vet team should prescribe and demonstrate the home exercises. Massage is part of some plans, but it does not move a kneecap back into place, so read our [dog massage guide](https://dogserv.com/dog-massage/) with that in mind.

![Toy fox terrier resting on a thick orthopedic dog bed beside a sofa, a low pet ramp leaning against the sofa cushion](https://dogserv.com/blog/luxating-patella-in-dogs/conservative-care.jpg)

## What does surgery involve, how long is recovery, and what does it cost?

The operation is chosen by grade, direction of the slip, limb alignment, bone deformity and any other knee disease. [ACVS](https://www.acvs.org/small-animal/patellar-luxations/) and Merck list these procedures:

- Soft-tissue release and tightening.
- Trochleoplasty, which deepens the groove in the thigh bone.
- Tibial tuberosity transposition, which realigns the tendon that holds the kneecap.
- Corrective thigh or shin bone cutting (osteotomy) for severe deformity.

Recovery takes several weeks of restricted activity, especially when bone has been cut. Expect temporary confinement, controlled movement and careful monitoring, not a quick return to normal play. Your surgeon sets the exact plan, and follow-up X-rays may be used to check healing. Rehabilitation can support mobility and muscle recovery. ACVS reports that more than 90 percent of owners are satisfied with postoperative progress. It calls recurrence uncommon, and says implant migration or breakage, infection and delayed bone healing can occur rarely.

Prices differ by hospital, so treat these as dated examples, not a national average. They may not cover every exam, anesthesia, hospital stay, implant, rehab visit or complication.

Luxating patella surgery: hospital-specific cost examples

| Hospital | Estimate | Date |
| --- | --- | --- |
| Hospital [Veterinary Surgery of Vermont](https://www.vetsurgeryvt.com/prices) | Estimate$4,000 to $5,000 | DatePrice page, October 2026 |
| Hospital [Integrity Veterinary Center](https://integrityvetcenter.com/pricing-transparency/) | Estimate$5,000 to $6,000 | DatePrice page, October 2026 |
| Hospital [Superior Animal Hospital](https://superioranimalhospital.com/wp-content/uploads/2025/05/SuperiorAH2024Flyer.pdf), one repair category | EstimateAbout $3,400 to $4,000 small dog; $3,600 to $4,600 medium or large dog | Date2024 estimate |
| HospitalSuperior Animal Hospital, another repair category | EstimateAbout $4,900 to $6,300 small or medium dog; $4,000 to $4,500 large dog; $5,200 to $7,000 giant breed | Date2024 estimate |

Superior Animal Hospital's estimate also gives examples of 10 to 14 days for suture or staple removal and 8 to 10 weeks for a follow-up X-ray. Ask for an itemized written estimate before you agree to anything.

## Does pet insurance cover luxating patella surgery?

Sometimes, and the timing is what decides it. [AKC Pet Insurance](https://www.akcpetinsurance.com/resources/faq/coverage) lists luxating patella as an inherited or congenital condition, and says hereditary and congenital coverage can be added to an accident-and-illness policy for pets under 2 years old. Another insurer's [orthopedic waiting-period page](https://www.embracepetinsurance.com/help/article/what-is-the-waiting-period-for-orthopedic-conditions) puts patellar luxation in a 180-day exclusion period for dogs, and symptoms during that period count as pre-existing.

Waiting periods, state availability, deductibles, annual limits and the policy's own definition of pre-existing all control the result. Read your own policy before you count on a payout, and see our [pet insurance guide](https://dogserv.com/pet-insurance-for-dogs/) for how those terms work. If your dog already skips, ask the insurer directly how that history is treated.

![Kitchen table with a plain folder, a pen and a closed laptop, a calm white Maltese lying on a rug beside it](https://dogserv.com/blog/luxating-patella-in-dogs/insurance-and-costs.jpg)

## What should you do today?

Here is the short list I would work through:

1.  Do not try to pop the kneecap back in at home. Putting it back is part of the veterinary exam, not a home skill, and forcing it can hurt your dog.
2.  Film an episode. A short video of the skip is easy for a vet to read when the dog walks normally in the exam room.
3.  Write down which leg it is, how often it happens, and whether your dog goes back to normal walking. Note any lasting lameness, refusal to bear weight or trouble standing.
4.  Book the evaluation and ask what grade your dog has, whether X-rays are advised, whether one or both knees are involved, what activity is allowed and whether rehabilitation fits.
5.  If surgery is discussed, request an itemized estimate.

You can also make the house easier on the knees. Keep your dog at an ideal weight, choose steady, regular exercise over sudden strenuous bursts, add secure non-slip surfaces, use ramps if your vet recommends them, and [keep nails trimmed](https://dogserv.com/how-to-trim-dog-nails/) because long nails affect traction and gait. If your dog has surgery, follow the restrictions exactly. Our guides to [how much exercise a dog needs](https://dogserv.com/how-much-exercise-does-a-dog-need/) and [senior dog care](https://dogserv.com/senior-dog-care/) help with the general picture, and [hip dysplasia](https://dogserv.com/hip-dysplasia-in-dogs/) is worth a read because limb alignment problems can overlap.

**Quiz: Quick check: luxating patella**

1. What does grade 4 mean?
   - The kneecap is permanently out and cannot be put back by hand **(correct answer)**
   - The kneecap slips out only when pushed
   - The dog has no signs at all
2. What is the classic gait sign?
   - Skipping or carrying a back leg for several steps, then walking normally **(correct answer)**
   - Dragging both front paws
   - Shaking the head
3. Does every symptom-free luxating patella need surgery?
   - Yes, as soon as it is found
   - No, symptom-free cases are generally monitored **(correct answer)**
   - Only in small dogs
4. What can conservative care do?
   - Realign the kneecap
   - Improve comfort and function without correcting the anatomy **(correct answer)**
   - Replace the need for an exam
5. Can symptoms during an insurance waiting period matter?
   - Yes, they may be treated as pre-existing **(correct answer)**
   - No, waiting periods do not apply to knees
   - Only if surgery is done within a year

## Questions owners ask about luxating patella

These are the questions that come up most often, with short answers.

### Can a luxating patella heal itself?

No. It is a problem with how the knee developed or lines up, so it does not correct itself. Mild cases may stay stable for years, and conservative care can help comfort, but only surgery changes the anatomy.

### How long can a dog live with a luxating patella?

Cornell says dogs without significant signs generally have a good prognosis and may be managed comfortably for many years, and VCA says some grade 1 dogs live with it their whole lives. Severe or persistently symptomatic disease carries a higher risk of arthritis, reduced mobility and other knee injury.

### Is walking good for a dog with a luxating patella?

Controlled, regular exercise is part of conservative care, while sudden strenuous activity is not. Ask your vet what amount and type fit your dog's grade, and follow the activity plan exactly after any surgery.

### Can I pop the kneecap back in at home?

No. Repositioning belongs to the veterinary exam. Your best help at home is a video of the episode and the notes described above.

### What exercises can I do at home?

Ask your vet or a veterinary rehabilitation professional. Rehabilitation is individualized, and the exact exercises should be prescribed and shown to you by your dog's care team.

## Your next step

If your dog is skipping, call your vet this week, bring the video, and ask what grade the knee is and whether X-rays make sense. If the leg suddenly stops bearing weight, do not wait for a routine slot; use an [emergency vet](https://dogserv.com/directory/vets/). I am not a veterinarian, and the exam is what turns a worrying skip into a plan you can make decisions about.

## Sources

- **akcpetinsurance.com**: [AKC Pet Insurance](https://www.akcpetinsurance.com/resources/faq/coverage)
- **American Animal Hospital Association**: [AAHA](https://www.aaha.org/resources/what-is-veterinary-physical-rehabilitation/)
- **American College of Veterinary Surgeons**: [American College of Veterinary Surgeons](https://www.acvs.org/small-animal/patellar-luxations/)
- **Cornell University College of Veterinary Medicine**: [Cornell's Riney Canine Health Center](https://www.vet.cornell.edu/departments-centers-and-institutes/riney-canine-health-center/canine-health-information/patellar-luxation)
- **embracepetinsurance.com**: [orthopedic waiting-period page](https://www.embracepetinsurance.com/help/article/what-is-the-waiting-period-for-orthopedic-conditions)
- **integrityvetcenter.com**: [Integrity Veterinary Center](https://integrityvetcenter.com/pricing-transparency/)
- **Merck Veterinary Manual**: [Merck Veterinary Manual](https://www.merckvetmanual.com/musculoskeletal-system/arthropathies-and-related-disorders-in-small-animals/patellar-luxation-in-dogs-and-cats)
- **superioranimalhospital.com**: [Superior Animal Hospital](https://superioranimalhospital.com/wp-content/uploads/2025/05/SuperiorAH2024Flyer.pdf)
- **VCA Animal Hospitals**: [VCA Animal Hospitals](https://vcahospitals.com/know-your-pet/luxating-patella-in-dogs)
- **vetsurgeryvt.com**: [Veterinary Surgery of Vermont](https://www.vetsurgeryvt.com/prices)