Legg-Calvé-Perthes Disease in West Highland White Terriers - Complete Guide
Overview
Legg-Calvé-Perthes disease (LCPD) is one of the most significant orthopedic conditions affecting West Highland White Terriers, with the breed ranking among the top five most commonly diagnosed. This condition involves avascular necrosis of the femoral head—the ball portion of the hip joint loses its blood supply, leading to bone death, collapse, and painful arthritis. West Highland White Terrier owners should be aware that LCPD typically strikes young dogs between four and twelve months of age, and early recognition is critical for the best surgical outcomes. With appropriate treatment, most Westies recover excellent limb function, but untreated cases progress to chronic pain and permanent lameness.
Why West Highland White Terriers Are Susceptible to Legg-Calvé-Perthes Disease
Legg-Calvé-Perthes disease overwhelmingly targets small and toy breeds under 12 kilograms (roughly 25 pounds), and the West Highland White Terrier sits squarely in this risk category at a typical adult weight of 7–10 kg (15–22 lbs). Research strongly supports an autosomal recessive mode of inheritance in terrier breeds, meaning a Westie must inherit a defective gene copy from both parents to develop the condition. The heritability estimate for LCPD in small terrier breeds has been reported as high as 0.56–0.76, indicating a powerful genetic component.
The anatomical structure of the Westie hip contributes to susceptibility. Small-breed dogs have a relatively limited number of retinacular blood vessels supplying the femoral head compared to larger breeds. The single medial circumflex femoral artery that provides the majority of blood flow to the developing femoral epiphysis is more vulnerable to compromise in compact hip joints. Any disruption—whether from conformational stress, hormonal factors during rapid growth, or inherited vascular anomalies—can trigger the ischemic cascade that defines LCPD.
Historically, West Highland White Terriers were bred for vermin hunting in the Scottish Highlands, selecting for a compact, muscular build with active hindquarters. This breeding emphasis on a sturdy rear drive may have inadvertently concentrated genes associated with vascular vulnerability in the hip. Epidemiological studies consistently place Westies alongside Yorkshire Terriers, Miniature Pinschers, Toy Poodles, and Lakeland Terriers among the breeds at highest risk, with some veterinary orthopedic databases reporting breed-specific incidence rates of 2–5%.
Recognizing Legg-Calvé-Perthes Disease in Your West Highland White Terrier
The hallmark sign in Westies is progressive hindlimb lameness, typically affecting one leg. Bilateral involvement occurs in approximately 10–15% of cases. Owners often first notice their young Westie beginning to favor a rear leg during walks or after play sessions. Because Westies are naturally spirited and active dogs, early subtle signs can be mistaken for a minor strain or growing pains.
Breed-specific presentation details to watch for include:
- Gradual onset limping that worsens over two to eight weeks, often without any history of injury or trauma.
- Muscle wasting in the affected thigh. Because Westies carry a dense double coat, owners may not notice muscle loss visually but can feel a difference by comparing the muscle mass of both rear legs with their hands.
- Reluctance to jump onto furniture, climb stairs, or engage in their typical energetic play. Westies are known for their confident, bold temperament, so a noticeable withdrawal from activity should raise concern.
- Pain on hip manipulation. Your Westie may cry, snap, or pull away when the affected hip is extended or rotated during handling.
- Sitting with the affected leg extended to one side rather than tucked under the body.
- A shortened stride on the affected side, sometimes accompanied by an audible clicking or crepitus in the hip joint as the disease progresses.
Age of Onset in West Highland White Terriers
LCPD in West Highland White Terriers follows a predictable age pattern:
- 4–6 months: The ischemic process begins at the cellular level. Radiographs may appear normal or show very subtle changes. Owners rarely notice clinical signs at this stage.
- 5–8 months: Early clinical lameness typically appears. Owners may notice intermittent limping after exercise or stiffness on rising. This is the optimal window for diagnosis.
- 7–11 months: Progressive bone collapse and joint incongruity develop. Lameness becomes consistent, muscle atrophy is detectable, and pain on hip manipulation is evident.
- Beyond 12 months: If untreated, secondary osteoarthritis becomes established. The femoral head is significantly deformed, and chronic pain limits mobility.
Diagnostic Process
When a young West Highland White Terrier presents with hindlimb lameness, your veterinarian will follow a systematic approach:
Physical Examination: Orthopedic evaluation includes assessing gait, palpating both hip joints, testing range of motion, and measuring thigh muscle circumference bilaterally. Westies with LCPD typically show pain on extension and internal rotation of the affected hip, with decreased range of motion compared to the unaffected side. Radiography: Standard ventrodorsal hip radiographs are the primary diagnostic tool. Early findings include increased joint space, subtle lucency (dark areas) in the femoral head, and irregularity of the femoral epiphysis. Advanced cases show femoral head collapse, fragmentation, flattening, and secondary arthritic changes in the acetabulum. Both hips should always be radiographed, given the 10–15% bilateral incidence. Advanced Imaging: In early or ambiguous cases, CT scanning can detect bone changes before they become apparent on standard radiographs. MRI may be used to evaluate the extent of avascular necrosis and remaining viable bone. Breed-Specific Screening: The Orthopedic Foundation for Animals (OFA) maintains a registry for LCPD evaluations. Radiographic screening of breeding Westies at 12 months of age is recommended. Dogs intended for breeding should have OFA-evaluated hip radiographs and receive clearance. While no commercially available DNA test for LCPD currently exists specifically for Westies, research into identifying the causative genes is ongoing, and genetic testing may become available as studies in terrier breeds advance. Differential Diagnosis: Your veterinarian will rule out other causes of hindlimb lameness in young Westies, including patellar luxation (also common in the breed), fractures, septic arthritis, and immune-mediated polyarthritis.Treatment Approach for West Highland White Terriers
Surgical Treatment
Femoral head and neck ostectomy (FHO) is the gold-standard treatment for LCPD in West Highland White Terriers and carries an excellent prognosis in this breed. The procedure involves removing the diseased femoral head and neck, allowing a fibrous pseudo-joint (false joint) to form. Westies are ideal candidates for FHO because their small body weight means the pseudo-joint bears less mechanical load, resulting in consistently good to excellent outcomes.Success rates for FHO in small breeds like Westies exceed 90%, with most dogs returning to normal or near-normal activity levels. Total hip replacement (THR) is an alternative but is rarely necessary in Westies given the excellent FHO outcomes and the technical challenges of placing implants in small-breed patients.
Anesthesia Considerations
West Highland White Terriers do not carry known breed-specific anesthesia sensitivities comparable to those in sighthound breeds. However, their small size requires careful attention to:
- Thermoregulation: Westies lose body heat rapidly under anesthesia. Active warming devices, warmed intravenous fluids, and insulated surgical tables are essential.
- Fluid rates: Precise intravenous fluid delivery using syringe pumps or pediatric drip sets prevents overhydration.
- Drug dosing: Weight-based dosing must be calculated carefully. Even small errors in anesthetic or analgesic dosing are magnified in a 7–10 kg patient.
Pain Management
Post-operative analgesia typically includes:
- NSAIDs such as meloxicam or carprofen, dosed at the lower end for small breeds and monitored with renal and hepatic bloodwork.
- Opioid analgesics (buprenorphine or tramadol) for the first 5–7 days post-surgery.
- Gabapentin may be added for neuropathic pain component.
Recovery Expectations
- Weeks 1–2: Strict rest with short leash walks for elimination only. Most Westies begin toe-touching within 7–10 days.
- Weeks 3–6: Gradually increasing controlled leash walks. Physical rehabilitation exercises, including passive range of motion, begin.
- Weeks 6–12: Progressive return to normal activity. Muscle mass rebuilds with consistent, controlled exercise.
- 3–6 months: Most Westies achieve full functional recovery. Some may retain a subtle gait asymmetry detectable only by trained observers.
Managing Legg-Calvé-Perthes Disease Day-to-Day
Exercise Modifications
During recovery and long-term management, tailor your Westie's activity:
- Controlled leash walks on flat, non-slippery surfaces. Start with 5–10 minute walks two to three times daily post-surgery, gradually increasing duration.
- Swimming or underwater treadmill therapy is excellent for Westies—it builds muscle without joint impact. Many rehabilitation centers offer small-breed hydrotherapy sessions.
- Avoid high-impact activities such as jumping on and off furniture, running on hard surfaces, or rough play with larger dogs during the recovery period.
- Ramps or pet stairs for accessing furniture or vehicles reduce joint stress long-term.
Diet and Weight Management
Maintaining a lean body condition is critical. Even an extra kilogram on a Westie's frame significantly increases hip joint loading. Feed a high-quality, age-appropriate diet and measure portions carefully. Target a body condition score of 4–5 on the 9-point scale, where you can easily feel ribs under a thin fat covering.
Supplements
- Omega-3 fatty acids (EPA/DHA from fish oil) at 75–100 mg/kg daily support joint health and reduce inflammation.
- Glucosamine and chondroitin sulfate may offer modest cartilage support for the contralateral hip and other joints.
- Green-lipped mussel extract provides additional anti-inflammatory glycosaminoglycans.
Environmental Adaptations
- Place non-slip mats or rugs on slippery floors, especially in areas where your Westie transitions between surfaces.
- Provide an orthopedic dog bed with supportive memory foam to cushion joints during rest.
- Keep your Westie's nails trimmed short to ensure proper foot placement and minimize gait compensation.
Breeder Screening & Prevention
Responsible West Highland White Terrier breeders play a pivotal role in reducing LCPD prevalence:
- Radiographic screening of all breeding stock at 12 months or older through the OFA LCPD registry. Only dogs with normal hip evaluations should be bred.
- Pedigree analysis: Because LCPD follows an autosomal recessive pattern, breeders should track affected individuals across generations and avoid breeding carriers to carriers. If a dog produces affected offspring, both parents should be considered carriers and breeding decisions adjusted accordingly.
- Health certification transparency: Reputable Westie breeders provide OFA results, health testing documentation, and pedigree health histories to puppy buyers.
- Breed club health initiatives: The West Highland White Terrier Club of America (WHWTCA) recommends hip evaluation as part of its health testing protocols. Buyers should verify that breeders participate in recommended health screenings.
- OFA hip evaluation results for both parents.
- History of LCPD in the lineage.
- Health guarantee covering genetic orthopedic conditions.
- Evidence of participation in breed club health programs.
Support & Resources
- West Highland White Terrier Club of America (WHWTCA): Maintains breed health information, breeder referrals, and health research funding initiatives. [westieclubamerica.com](https://www.westieclubamerica.com)
- Orthopedic Foundation for Animals (OFA): Searchable database of LCPD evaluations and hip certifications. [ofa.org](https://www.ofa.org)
- Westie Foundation of America: Funds research into genetic conditions affecting West Highland White Terriers, including orthopedic diseases. [westiefoundation.org](https://www.westiefoundation.org)
- American College of Veterinary Surgeons (ACVS): Provides a surgeon locator for board-certified specialists experienced in FHO and small-breed orthopedics. [acvs.org](https://www.acvs.org)
- Canine Rehabilitation Institute: Directory of certified canine rehabilitation practitioners for post-surgical physical therapy. [caninerehabinstitute.com](https://www.caninerehabinstitute.com)