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How to Know If Your Dog Is a Candidate for Total Hip Replacement

How to Know If Your Dog Is a Candidate for Total Hip Replacement

Total Hip Replacement

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Owners

Find out the key health, age, and breed factors that determine if your dog is a candidate for total hip replacement surgery

By 

Sustainable Vet Group

Updated on

July 17, 2026

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This article is for informational purposes only and is not a substitute for professional veterinary advice. Every case is unique, so always consult your veterinarian for guidance specific to your pet.

This content is intended for veterinary professionals for educational purposes. It does not replace clinical judgment or tailored advice. Always rely on your training, expertise, and the specific context of your patients.

How to Know If Your Dog Is a Candidate for Total Hip Replacement

Not every dog with a bad hip is a candidate for total hip replacement. The decision involves a specific set of criteria that must all be met, and understanding what those criteria are helps you know what questions to ask and what the screening process actually looks for.

 

Quick answer: THR candidates must meet four main requirements: hip pain that is unresponsive to conservative management; skeletal maturity (typically 9 to 12 months or older); sufficient body size to accommodate the smallest implant (generally 40+ lbs, though smaller implants now exist); and good general health with no active infection, no significant neurological disease, and appropriate bone quality. X-rays alone don't determine candidacy — clinical signs must be present.

 

Key takeaways

  • Pain unresponsive to conservative care is the primary trigger: X-ray severity alone doesn't indicate THR.
  • Skeletal maturity is required: most dogs need to be at least 9 to 12 months old.
  • No upper age limit exists for THR; health status matters more than chronological age.
  • Active infection anywhere in the body disqualifies a dog until the infection is resolved.
  • Neurological disease affecting the hindlimbs may mean THR won't improve function.
  • Only about 25% of dogs referred for THR evaluation ultimately receive the surgery, reflecting careful screening.

The primary criterion: pain that doesn't respond to conservative care

VetBloom's clinical review of THR candidacy notes that approximately 25% of dogs referred for THR evaluation go on to receive the procedure. This reflects the careful screening process, not a problem with the technology.

The starting point for candidacy is pain and lameness from a hip condition that conservative management has genuinely failed to control. The NDSR (North Downs Specialist Referrals) states: "Candidates for THR surgery are dogs and cats with persistently painful hips that are not responding satisfactorily to medical management, including exercise restriction, weight control, and judicious use of pain killers."

Critically, NDSR also notes: "Dogs with hip dysplasia or osteoarthritis, no matter how severe, are not candidates for THR surgery if signs of pain and lameness are mild and readily controlled by conservative measures."

Austin Veterinary Emergency and Specialty confirms: "The decision to perform THR should not be determined based only on your dog's X-rays."

The radiographs inform the diagnosis and surgical planning. The clinical picture (how much pain the dog is in, and whether it responds to appropriate management) determines whether surgery is the right step.

For the hip dysplasia context that most commonly leads to THR consideration, see hip dysplasia as the primary indication.

For a complete overview of what total hip replacement surgery involves, see what THR involves.

Age: skeletal maturity requirement

THR requires that bone growth is complete before surgery. Implants are placed into the femoral canal and acetabulum; in a growing dog, the bone geometry is still changing, which would compromise implant fit and stability.

Standard minimum age:

  • Most breeds: 9 to 12 months
  • Giant breeds (Great Danes, Saint Bernards, Irish Wolfhounds): up to 18 to 24 months
  • Dallas Veterinary Surgical Center: "Ideal candidates are at least 10 months or older"

Upper age limit: None. NDSR states: "There is no upper age limit" for THR. As with any surgery in older dogs, pre-surgical screening assesses anesthetic risk, but age alone does not disqualify a dog.

Size: body weight and implant fit

THR requires that the dog's anatomy can accommodate the smallest available implant. Austin Veterinary Emergency and Specialty states: "Your dog must be large enough to accommodate the smallest prosthesis. Total hips can usually be placed in dogs weighing 40 pounds or more."

However, this threshold is shifting with modern implant systems. Mini and micro implants now allow THR in smaller dogs and cats. VSC Sarasota: "Most dogs between 50 and 140 lbs are candidates for the procedure," reflecting typical but not absolute weight ranges.

Important nuance: Very small dogs who are otherwise excellent candidates may be evaluated for mini-implant systems at centers with specific small-patient experience. If your small dog has a hip condition that would benefit from THR, it's worth consulting with a THR specialist before assuming FHO is the only option.

Overweight dogs: Excess body weight is a relative contraindication. Obesity increases surgical risk, slows recovery, and places more stress on the new implant. Losing weight before surgery improves both safety and outcome. Some surgeons will delay THR until a dog reaches a target body condition score.

Health: general medical requirements

No active infection anywhere in the body

This is a hard requirement. Bacteria from any infection can travel through the bloodstream to colonize the new implant, causing implant infection: the most catastrophic THR complication.

VSC Sarasota: "If your dog has an active infection anywhere including a skin hot spot, urinary tract infection, or dental disease, the surgery must be delayed because bacteria can travel through the blood to the new hip."

Pre-surgical health checks specifically look for:

  • Skin infections or pyoderma
  • Urinary tract infections (urine culture/analysis required)
  • Dental disease (dental treatment before THR is often required)
  • Any systemic infection or fever

All active infections must be fully resolved before THR can proceed.

No significant neurological disease affecting the hindlimbs

If a dog's hindlimb dysfunction is neurological (spinal cord disease, degenerative myelopathy, lumbosacral disease) rather than purely from hip pain, THR may not improve function. The new hip provides a pain-free joint, but if the nerves driving the leg aren't working properly, the dog won't be able to use the leg better afterward.

VSC Sarasota: "We also look closely at neurological health; if your dog has a spine issue that prevents them from feeling or controlling their legs, a new hip won't help them walk better."

Pre-surgical neurological assessment rules out significant concurrent nerve disease.

Organ function for anesthesia

Standard pre-surgical bloodwork assesses kidney and liver function. Both organs process anesthetic drugs; impaired function increases risk. Senior dogs, dogs on long-term medications, and dogs with known organ conditions receive additional cardiac assessment (ECG, chest radiographs) before THR.

Bone quality

The implant must osseointegrate (in cementless systems) or be secured with cement to adequate bone. Severely osteoporotic bone, prior significant hip surgery, or major bony defects may compromise implant stability. Calibrated radiographs are used to assess bone quality and confirm appropriate implant sizing.

For how candidacy factors affect long-term outcomes, see outcomes to consider when evaluating candidacy.

Conditions that lead to THR

Hip dysplasia with established secondary arthritis is the most common indication. Other conditions that qualify:

  • Irreducible or recurring hip luxation
  • Femoral head or neck fractures (in appropriate candidates)
  • Avascular necrosis (Legg-Calvé-Perthes disease) in larger dogs
  • Failed FHO in appropriately screened candidates (technically more complex)
  • Severe end-stage hip arthritis from any cause

For how THR compares with FHO as the primary surgical alternative, see FHO as an alternative for non-candidates.

What the candidacy evaluation looks like

When you're referred to a THR specialist for evaluation, expect:

  1. Complete orthopedic examination: assessment of hip pain, range of motion, gait, and all other joints
  2. Calibrated radiographs: taken in specific standardized positions to determine implant size and assess bone quality; different from standard diagnostic X-rays
  3. Pre-surgical bloodwork: CBC, chemistry panel, urinalysis, and culture as needed
  4. Neurological assessment: to rule out concurrent spinal or nerve disease
  5. Cardiac assessment: ECG and chest films in senior dogs or those with known cardiac concerns
  6. Infection screening: culture of joint fluid if infection is suspected; urine culture; skin assessment

If all criteria are met, the surgeon selects the appropriate implant system and size, and surgery is scheduled.

For the cost implications of the candidacy evaluation and the surgery itself, see cost to consider as a candidate.

Frequently asked questions

My dog's X-rays look very bad but they're not limping much. Are they a candidate?

Not yet. The THR indication is clinical lameness and pain that isn't controlled by conservative management, not radiographic severity alone. A dog with severe X-ray changes who is comfortable on appropriate management is not a surgical candidate at that point.

My vet referred my dog for THR evaluation and the surgeon said they don't qualify. What now?

Non-qualification is common. About 75% of dogs referred for THR evaluation don't receive the surgery. The most common reasons are: pain is actually manageable conservatively, an infection must be resolved first, neurological disease is contributing, or the dog is too young or too small. Your vet and the surgeon together can advise on the appropriate next path, which may be continued conservative management, FHO, or THR after specific issues are addressed.

Can a dog who previously had FHO have THR?

In general, prior FHO makes THR more complex and is often considered a relative contraindication. NDSR states: "In general, animals who have already had the femoral head removed are not suitable for hip replacement surgery, although there are occasional exceptions." If you're exploring THR after a prior FHO, consult specifically with a surgeon who has experience with this conversion.

THR candidacy is about the intersection of the right condition, the right body, the right health status, and the right clinical picture. Radiographs support the diagnosis, but they don't determine candidacy. What determines candidacy is pain that isn't controlled any other way, in a body that can safely receive and integrate an implant.

Resources

  • NDSR. Total Hip Replacement Surgery (THR) in Dogs and Cats. ndsr.co.uk
  • Austin Veterinary Emergency and Specialty. What Dog Owners Should Know About Total Hip Replacement. austinvets.com
  • VSC Sarasota. Canine Total Hip Replacement (THR). vscsarasota.com
  • VetBloom. Indications and Candidate Screening for Total Hip Replacement in the Dog. vetbloom.com

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