PennHIP vs OFA Hip Testing: Which Do Breeders Need?

Hip dysplasia is one of the most common genetic health problems in dogs. Responsible breeders test their breeding dogs for hip health before breeding them. But there are two main testing methods: OFA (Orthopedic Foundation for Animals) and PennHIP. Which one do you need? The answer depends on your breed, parent club requirements, and what buyers expect.

This guide explains both testing methods, compares their strengths and weaknesses, and helps you decide which test is right for your breeding program. We'll also cover what buyers look for when choosing a breeder and how health testing affects your reputation.

What Is OFA Hip Testing?

The Orthopedic Foundation for Animals (OFA) has been evaluating hip X-rays since 1966. It's the most widely recognized hip screening method in the United States. Here's how it works:

1. Your veterinarian takes an X-ray of your dog's hips using a specific positioning technique (the dog lies on its back with legs extended).
2. You submit the X-ray to OFA along with a fee (around $50-70 for preliminary evaluations, higher for official ratings).
3. Three board-certified veterinary radiologists independently review the X-ray.
4. OFA assigns a hip grade based on the consensus evaluation.

Dogs must be at least 24 months old for an official OFA rating. The grades are:

• Excellent: Superior hip conformation with deep socket and tight fit
• Good: Well-formed hips with minor imperfections
• Fair: Acceptable but with some minor irregularities
• Borderline: Not quite normal, may improve or worsen with age
• Mild Dysplasia: Early signs of hip dysplasia
• Moderate Dysplasia: More obvious malformation
• Severe Dysplasia: Significant hip problems

Most parent breed clubs require breeding dogs to have OFA ratings of Fair or better (Excellent, Good, or Fair). Some clubs only accept Good or Excellent.

What Is PennHIP Testing?

PennHIP (Pennsylvania Hip Improvement Program) was developed at the University of Pennsylvania in the 1990s. It measures hip laxity (looseness) rather than just looking at joint appearance. Here's how it differs:

1. Only veterinarians who have completed PennHIP certification training can perform the test.
2. The dog is sedated or anesthetized for comfort during positioning.
3. The vet takes three X-ray views: standard hip-extended view, compression view, and distraction view.
4. PennHIP measures the distraction index (DI), which shows how loose the hip joint is.
5. You receive a report showing your dog's DI score compared to breed averages.

Dogs can be tested as young as 16 weeks old, though most breeders wait until closer to breeding age. The DI score ranges from 0 (tight hips) to 1.0+ (very loose hips). Lower scores mean better hip quality.

PennHIP provides percentile rankings. For example, a Golden Retriever with a DI of 0.35 might be in the 50th percentile for the breed. A DI of 0.25 might be in the 25th percentile (better than 75% of Golden Retrievers tested).

Key Differences Between PennHIP and OFA

Understanding the differences helps you choose the right test for your program:

Age Requirements

• OFA: Dogs must be 24 months old for official ratings (preliminary exams available earlier but not recognized by most clubs)
• PennHIP: Can test dogs as young as 16 weeks, results are valid at any age

Testing Method

• OFA: Subjective evaluation by radiologists looking at hip conformation
• PennHIP: Objective measurement of hip laxity with numerical DI score

Sedation

• OFA: Usually no sedation needed (though some dogs may need light sedation for positioning)
• PennHIP: Requires sedation or anesthesia for accurate measurements

Veterinarian Requirements

• OFA: Any licensed veterinarian can take X-rays and submit them
• PennHIP: Only PennHIP-certified veterinarians can perform the test

Cost

• OFA: Generally $100-200 total (vet X-ray fee plus OFA evaluation fee)
• PennHIP: Usually $250-500 (includes sedation, three X-ray views, and analysis)

Predictive Value

• OFA: Assesses current hip condition at time of X-ray
• PennHIP: Research suggests DI scores predict future hip dysplasia risk more accurately, even in young dogs

Which Test Do Parent Clubs Require?

This is the most important factor for many breeders. Parent breed clubs set health testing requirements for their breeds. Most clubs recognize OFA as the standard, but some accept PennHIP results.

Here's what you need to know:

• AKC breed clubs: Most require OFA Good or better for CHIC (Canine Health Information Center) certification. Some accept PennHIP as an alternative.
• Working dog organizations: Many accept either OFA or PennHIP, focusing on the quality of results rather than the specific test.
• International clubs: FCI (international) standards typically use their own scoring systems, though some accept OFA or PennHIP results.

Some popular breeds and their typical requirements:

• Golden Retrievers: OFA Good or better (or PennHIP with DI below breed median)
• German Shepherds: OFA Good or better preferred
• Labrador Retrievers: OFA Good or better (PennHIP accepted by some clubs)
• Rottweilers: OFA Good or better required for breeding recommendations

What Do Puppy Buyers Expect?

Educated puppy buyers research health testing before choosing a breeder. In 2026, buyers are more informed than ever thanks to online resources and breeder education websites.

Here's what buyers typically look for:

• Proof of testing: Buyers want to see actual test results, not just verbal claims. OFA results are publicly searchable on the OFA website, which builds trust.
• Both parents tested: Responsible buyers expect hip testing on both the sire and dam.
• Passing results: Fair or better for OFA, or DI scores in the better half of the breed range for PennHIP.
• Recent testing: Some buyers prefer tests done within the last few years, though official OFA ratings don't expire.

OFA's public database is a major advantage for breeders. When you register test results with OFA, buyers can independently verify your claims. This transparency builds confidence. PennHIP results are not publicly searchable, so you'll need to provide documentation directly to buyers.

Can You Do Both Tests?

Yes, and some breeders choose to do both OFA and PennHIP on their breeding dogs. This provides maximum information and appeals to buyers who are familiar with either testing method.

Benefits of doing both tests:

• You can meet parent club requirements (usually OFA) while also getting predictive data (PennHIP).
• PennHIP results help you make breeding decisions earlier, before dogs reach OFA certification age.
• Having both tests shows extra commitment to health testing, which impresses serious buyers.
• If one test shows borderline results, the other provides additional information for decision-making.

The main drawback is cost. Doing both tests can add $300-400 per dog to your expenses. For breeders with multiple dogs, this adds up quickly.

Which Test Should You Choose?

Here's a simple decision framework based on your situation:

Choose OFA If:

• Your breed's parent club requires OFA for registration or breeding recommendations
• You want publicly searchable results that buyers can verify online
• You prefer a lower-cost option without sedation requirements
• You're comfortable waiting until dogs are 24 months old for official ratings
• Most breeders in your breed use OFA (standard practice)

Choose PennHIP If:

• You want to test dogs earlier than 24 months and make breeding decisions sooner
• Your breed club accepts PennHIP as an alternative to OFA
• You prefer objective numerical data over subjective evaluations
• You have access to a PennHIP-certified veterinarian in your area
• You breed working dogs where early selection is important

Do Both If:

• You can afford the additional expense and want maximum health data
• You're breeding high-value or rare dogs where every data point matters
• You want to appeal to the widest range of educated buyers
• You're testing young prospects and want early PennHIP data plus later OFA certification

How to Present Results to Buyers

Once you've tested your dogs, proper presentation of results matters. Here are best practices:

1. Register OFA results publicly: Don't opt for private registration. Public results build trust and let buyers verify independently.
2. Include results in your contract paperwork: Provide copies of hip test results when puppies go home. See our guide on essential breeder paperwork.
3. Explain results clearly: Many buyers don't understand hip testing. Include a simple explanation of what the scores mean.
4. Show results on your website: Post test results for all breeding dogs prominently. Link to OFA database entries.
5. Keep documentation organized: Maintain copies of all health test results in your breeding records for at least five years.

Beyond Hip Testing: Other Health Screens

Hip testing is just one component of a complete health screening program. Responsible breeders also test for:

• Elbows: OFA elbow evaluation for breeds prone to elbow dysplasia
• Eyes: Annual CERF/OFA eye exams by board-certified ophthalmologists
• Cardiac: Heart evaluations for breeds with cardiac disease risks
• Genetic tests: DNA tests for breed-specific conditions (progressive retinal atrophy, von Willebrand's disease, degenerative myelopathy, etc.)
• Patellas: Knee evaluations for small breeds prone to luxating patellas

The specific tests you need depend on your breed. Parent clubs publish recommended health testing protocols. Following these recommendations demonstrates professional breeding practices.

The Bottom Line

Both OFA and PennHIP are valuable hip screening tools. For most breeders, OFA testing is the standard choice because it's widely accepted, cost-effective, and provides publicly verifiable results. If your breed club requires OFA, that decision is made for you.

PennHIP offers advantages for breeders who want early testing and objective laxity measurements. It's especially useful for working dog breeders who need to make selection decisions before dogs reach two years old.

The most important thing is that you actually test your breeding dogs and select against hip dysplasia. Either test is far better than no testing at all. Educated buyers in 2026 expect health testing documentation, and it's a key factor that separates responsible breeders from backyard breeders and puppy mills.