Legg-Calvé-Perthes Disease in Dogs
What it is, why small breeds are at risk, and what treatment looks like.
Legg-Calvé-Perthes disease is a hip condition that affects small and toy-breed dogs, typically before their first birthday, and it can cause significant pain and limping if left untreated. If your puppy has been favoring a hind leg or showing signs of hip discomfort, this guide can help you understand what might be going on and what to do next.
TL;DR
- Legg-Calve-Perthes disease causes degeneration of the hip joint in dogs, usually small breeds like Yorkshire Terriers and Miniature Poodles.
- It leads to symptoms like hind limb lameness, hip pain, and muscle loss in young dogs between 4–12 months old.
- Diagnosis requires X-rays of the hip joint, and treatment often involves surgical options like femoral head ostectomy (FHO).
- With surgery and physiotherapy, most dogs recover well and lead active lives.
- Lemonade Pet Insurance covers orthopedic conditions like Legg-Calve-Perthes disease, as long as it’s not pre-existing.
What is Legg-Calve-Perthes Disease?
Legg-Calvé-Perthes disease is a condition where the femoral head (the rounded “ball” at the top of the thigh bone that fits into the hip socket) loses its blood supply. Without adequate blood flow, the bone tissue starts to break down, a process called avascular necrosis (literally, bone death caused by lack of blood). As the bone deteriorates, the hip joint becomes increasingly unstable and painful. The exact reason blood supply is disrupted isn’t fully understood, but genetics are thought to play a central role.
This condition most commonly affects small and toy breeds, typically between 4 and 12 months of age.
Symptoms to Watch For
Owners usually notice Legg-Calve-Perthes disease when their dog starts limping or avoiding putting weight on one of their hind legs. Symptoms can include:
- Gradual onset of hind limb lameness (usually affecting one leg)
- Pain when moving or touching the hip
- Muscle loss in the affected leg
- Reluctance to run, play, or climb stairs
- Irritability or signs of pain when picked up
If your puppy is limping or seems uncomfortable, it’s best to visit your vet. Early detection can make a big difference in treatment success.
Common Causes and Risk Factors
The exact cause of Legg-Calvé-Perthes disease isn’t fully understood, but it’s strongly associated with genetics. Small and toy breeds are most commonly affected, particularly Yorkshire Terriers, Toy and Miniature Poodles, Chihuahuas, West Highland White Terriers, Lakeland Terriers, and Manchester Terriers. While the condition isn’t caused by injury or activity level, the first signs typically appear during periods of rapid growth, most often between 5 and 8 months of age.
Diagnosis: How Your Vet Can Confirm
To diagnose this condition, your vet will start with a physical exam, checking for pain or limited movement in the hip. X-rays are the key diagnostic tool, they’ll show characteristic changes in the femoral head, like flattening, fragmentation, or collapse. These images help confirm the diagnosis and rule out other causes of hind limb lameness.
Treatment Options: What Comes Next
Surgery is the most common and effective treatment for Legg-Calvé-Perthes disease. The procedure is called a femoral head and neck ostectomy (FHO), where the vet removes the deteriorated femoral head and neck entirely, eliminating the source of pain. Over time, the surrounding muscles and soft tissue form what’s called a pseudoarthrosis (a “false joint” made of scar tissue and muscle that cushions the area and allows your dog to move with relatively normal function). In small dogs, this adapts remarkably well.
Here’s what the treatment process typically looks like:
- Before surgery: Rest and pain management may be recommended for mild cases or while waiting for surgery.
- Surgery: FHO is performed to remove the degenerated part of the hip joint.
- After surgery: Physiotherapy is key to helping your dog regain strength and movement.
In very early or mild cases, some vets may try conservative management first, rest and pain relief, but surgery is recommended in the vast majority of cases as the most reliable path to long-term comfort and function.
What About Prognosis?
With surgery and physical rehabilitation, the outlook is very good. Most small dogs return to full or near-full limb function following FHO. Small breeds tend to adapt especially well to the false joint, and many go on to live active, comfortable lives. Early intervention generally leads to the best results, so don’t wait if you suspect something is wrong.
Legg-Calve-Perthes Disease and Pet Insurance
Yes, Legg-Calvé-Perthes disease is covered under Lemonade Pet’s base accident and illness policy, as long as it isn’t pre-existing. That includes eligible costs like diagnostic imaging, surgery, and follow-up care that’s typically part of treatment for this condition.
Recovery from LCP disease often involves physical therapy, structured exercises and rehabilitation that help your dog regain strength and mobility after surgery. Lemonade’s Physical Therapy add-on can help cover the cost of those sessions, making it easier to follow through on the full course of recovery your dog needs.
Getting a policy in place while your dog is symptom-free is the smartest move. Once signs appear, the condition is typically considered pre-existing and won’t be eligible for coverage.
Before we go
Legg-Calve-Perthes disease might sound daunting at first, but with the right care, your small-breed dog can recover and thrive. Watch for early signs of lameness, and don’t hesitate to consult your vet if you notice anything unusual. Remember, surgery and physiotherapy can make a world of difference.
And if you’re considering pet insurance, Lemonade is here to help protect your four-legged family members when it matters most.
Frequently Asked Questions
What breeds are most at risk for Legg-Calve-Perthes disease?
Small and toy breeds like Yorkshire Terriers, Miniature Poodles, and Chihuahuas are most at risk.
How is Legg-Calve-Perthes disease treated?
The primary treatment is a femoral head ostectomy (FHO) surgery, followed by physiotherapy.
Can dogs fully recover from Legg-Calve-Perthes disease?
Yes, with early diagnosis, surgery, and rehabilitation, most small dogs recover well and stay active.
Does pet insurance cover Legg-Calve-Perthes disease?
Lemonade Pet Insurance covers orthopedic issues like LCP disease, as long as it’s not pre-existing.
What does an FHO surgery involve?
FHO surgery removes the damaged femoral head, allowing your dog’s body to form a functional false joint.
A few quick words, because we <3 our lawyers: This post is general in nature, and any statement in it doesn’t alter the terms, conditions, exclusions, or limitations of the policies issued, which differ according to your state of residence. You’re encouraged to discuss your specific circumstances with your own professional advisors. The purpose of this post is merely to provide you with info and insights you can use to make such discussions more productive! Naturally, all comments by, or references to, third parties represent their own views, and Lemonade assumes no responsibility for them. Coverage may not be available in all states. Please note that statements about coverages, policy management, claims processes, Giveback, and customer support apply to policies underwritten by Lemonade Insurance Company or Metromile Insurance Company, a Lemonade company, sold by Lemonade Insurance Agency, LLC. The statements do not apply to policies underwritten by other carriers.
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