Legg-Calve-Perthes Disease in Dogs: Symptoms & Surgery

Quick Answer
  • Legg-Calve-Perthes disease is a painful hip disorder in growing dogs where blood flow to the femoral head is disrupted, causing bone death, collapse, and arthritis over time.
  • It is seen most often in toy and small-breed puppies, usually between about 4 and 12 months of age, and often starts as a slowly worsening limp in one back leg.
  • Hip X-rays are the main way your vet confirms the diagnosis. Early cases can look subtle, so sedation and comparison views may be needed.
  • For many small dogs, femoral head ostectomy or femoral head and neck ostectomy (FHO/FHNO) is the standard treatment and often leads to good comfort and function with rehab.
  • Typical 2026 US cost ranges run about $250-$900 for exam, X-rays, and short-term medical management, and about $1,800-$4,500 for FHO surgery plus medications and follow-up.
Estimated cost: $250–$4,500

What Is Legg-Calve-Perthes Disease?

Legg-Calve-Perthes disease, also called avascular necrosis or aseptic necrosis of the femoral head, is a developmental hip disorder in young dogs. The "ball" of the hip joint loses part of its blood supply, so the bone weakens, deforms, and can eventually collapse. As that happens, the joint becomes painful and inflamed.

This condition is most common in toy and small breeds during growth, often before 1 year of age. Many dogs first show a mild limp that gradually becomes more obvious. Over time, the affected leg may look thinner because the thigh muscles shrink from disuse.

Although the name sounds alarming, many dogs do well when the problem is recognized early and treated appropriately. For small dogs, surgery to remove the damaged femoral head is commonly recommended because it can relieve pain and allow a functional false joint to form during healing.

Legg-Calve-Perthes usually affects one hip, but both sides can be involved in a smaller number of dogs. If your puppy has a progressive back-leg limp, your vet may recommend hip imaging even if the limp seems to come and go.

Signs of Legg-Calve-Perthes Disease

  • Mild to moderate hind-limb lameness that gradually worsens over days to weeks
  • Toe-touching or carrying one back leg, especially after play
  • Pain when the hip is extended, abducted, or touched
  • Reduced hip range of motion or stiffness after rest
  • Thigh muscle wasting on the affected side
  • Shortened stride or a hopping gait
  • Reluctance to jump onto furniture or climb stairs
  • Irritability, restlessness, or crying when picked up around the hips
  • Occasional clicking or popping from the hip area
  • In more advanced cases, near-complete non-weight-bearing on the leg

Signs usually build slowly rather than appearing all at once. Early on, a pet parent may notice a subtle limp after exercise. Later, the limp can become constant, and the thigh on that side may look noticeably smaller. See your vet promptly if your young small-breed dog has a worsening back-leg limp, pain with hip movement, or starts refusing normal activity. See your vet immediately if your dog suddenly cannot bear weight, cries out in pain, or seems severely distressed, because fractures, luxating patella, and other orthopedic problems can look similar.

What Causes Legg-Calve-Perthes Disease?

The exact cause is still not fully understood, but the disease is linked to interrupted blood supply to the developing femoral head. That loss of circulation leads to ischemia, bone death, and gradual collapse of the hip's ball portion. Veterinary references describe it as idiopathic, meaning the precise trigger is not always known.

There is strong evidence that heredity plays a role, especially in small and toy breeds. Research from Cornell has also supported a genetic contribution in predisposed dogs. Because of that concern, dogs diagnosed with Legg-Calve-Perthes disease are generally not recommended for breeding.

Breeds commonly reported as predisposed include Yorkshire Terriers, West Highland White Terriers, Toy and Miniature Poodles, Miniature Pinschers, Chihuahuas, Pugs, and other small terrier-type dogs. Males and females can both be affected.

This is different from hip dysplasia. Hip dysplasia is mainly a joint laxity and conformation problem, while Legg-Calve-Perthes is primarily a blood-supply problem affecting the femoral head during growth.

How Is Legg-Calve-Perthes Disease Diagnosed?

Diagnosis starts with your vet taking a careful history and orthopedic exam. Age, breed, and the pattern of a slowly progressive hind-limb limp are important clues. On exam, many dogs have hip pain, reduced range of motion, and visible muscle loss in the affected thigh.

Hip radiographs are the key test. X-rays may show flattening, irregular shape, increased patchiness, fragmentation, or collapse of the femoral head and neck. In early disease, changes can be subtle, so your vet may recommend sedation to get well-positioned images and compare both hips.

Your vet may also discuss other causes of limping in a young dog, such as luxating patella, trauma, fractures, hip dysplasia, or less commonly infection. Bloodwork is not diagnostic for Legg-Calve-Perthes itself, but it may be recommended before sedation or surgery and to help assess overall health.

If the case is unusual or the X-rays are not clear, referral imaging such as CT may be considered. In most dogs, though, signalment, exam findings, and standard hip X-rays are enough to make the diagnosis and plan treatment.

Treatment Options for Legg-Calve-Perthes Disease

Spectrum of Care means you have options. Here are treatment tiers at different price points.

Conservative: Short-Term Pain Control and Activity Restriction

$250–$900
Best for: Dogs with very mild signs, pet parents needing time to plan surgery, or dogs who are not immediate surgical candidates. This is usually a bridge plan rather than a definitive fix.
  • Office exam and orthopedic assessment
  • Hip X-rays, sometimes with sedation
  • Short course of pain control such as an NSAID if appropriate
  • Possible add-on pain medication such as gabapentin depending on your vet's plan
  • Strict leash walks and no running, jumping, or rough play
  • Body-weight management and home comfort changes
  • Recheck exam to monitor pain and function
Expected outcome: Fair for temporary comfort, but guarded long term if used alone. The bone changes usually continue, and many dogs remain painful or lose muscle over time.
Consider: Lower upfront cost and less immediate intervention, but it often does not stop progression. Delaying definitive treatment can mean more pain, more muscle loss, and a longer rehab period later.
Most Common

Standard: FHO Surgery With Rehabilitation

$1,800–$4,500
Best for: Most small and toy-breed dogs with confirmed Legg-Calve-Perthes disease. This is the most common first-line surgical option and often fits the size and mechanics of affected dogs well.
  • Pre-op exam and bloodwork
  • Femoral head and neck ostectomy or femoral head ostectomy performed by a general practitioner comfortable with orthopedic surgery or a surgeon
  • Anesthesia, pain control, and same-day or short-stay hospitalization
  • Home recovery instructions with restricted activity
  • Recheck visits and incision monitoring
  • Rehabilitation plan with early controlled limb use, range-of-motion work, and gradual leash-walk progression
Expected outcome: Good to excellent in many small dogs, especially when surgery is done before severe chronic disuse and when rehab is followed closely. Many return to comfortable daily activity within about 6 to 12 weeks, though muscle rebuilding can take longer.
Consider: Requires anesthesia, surgery, and committed aftercare. Some dogs keep a mild gait change or reduced hip extension, but comfort is often much improved. Outcomes are usually best when the dog stays lean and participates in rehab.

Advanced: Specialist Surgery or Total Hip Replacement

$6,000–$12,000
Best for: Selected dogs where FHO is less likely to meet function goals, larger-bodied patients, or dogs with persistent pain and poor function after prior surgery. It may also appeal to pet parents seeking every available option after specialist review.
  • Referral consultation with a board-certified surgeon
  • Advanced imaging or surgical planning if needed
  • Total hip replacement in selected cases, more often for larger dogs or failed prior management
  • Specialist anesthesia and hospitalization
  • Structured rehabilitation and repeat imaging
  • Longer-term follow-up for implant monitoring
Expected outcome: Often very good to excellent in appropriately selected cases, with the potential for more normal joint mechanics than FHO. Suitability depends on body size, anatomy, surgeon availability, and overall health.
Consider: Much higher cost range, stricter recovery rules, and implant-specific risks such as luxation, infection, or revision needs. It is not necessary for many typical small-breed Legg-Calve-Perthes patients.

Cost estimates as of 2026-03. Actual costs vary by location, clinic, and individual case.

Questions to Ask Your Vet About Legg-Calve-Perthes Disease

Bring these questions to your vet appointment to get the most out of your visit.

  1. How advanced does the hip damage look on my dog's X-rays right now?
  2. Is my dog a good candidate for conservative care, or do you recommend surgery sooner rather than later?
  3. Would FHO likely meet my dog's comfort and activity goals, or should we discuss referral options?
  4. Do you want to X-ray both hips to check for disease on the other side?
  5. What medications are appropriate for my dog before and after surgery, and what side effects should I watch for?
  6. What does the recovery timeline usually look like week by week?
  7. Which rehab exercises should I do at home, and when should I start them?
  8. What signs would mean my dog is not recovering as expected and needs a recheck?

Can Legg-Calve-Perthes Disease Be Prevented?

There is no guaranteed way to prevent Legg-Calve-Perthes disease in an individual puppy because the underlying cause appears to involve inherited and developmental factors. What pet parents can do is recognize limping early, avoid delaying evaluation, and work with your vet before the hip becomes more painful and the leg loses more muscle.

Breeding decisions matter. Because a hereditary component is strongly suspected, affected dogs are generally not recommended for breeding. If your dog is diagnosed, it is reasonable to notify the breeder so they can review related dogs and breeding plans.

After treatment, prevention shifts to protecting long-term function. Keeping your dog lean, following rehab instructions, and encouraging controlled use of the leg can all help recovery. Too much rest for too long can slow muscle rebuilding, while too much activity too soon can increase soreness.

Most importantly, do not try to manage a persistent puppy limp at home without guidance. Early imaging and a clear plan from your vet can make recovery smoother and help your dog get back to comfortable movement.

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