Why “Health Tested Parents” Doesn’t Mean a Guaranteed Healthy Puppy—For Puppy Buyers

Quick answer: Health testing on the parents lowers the chance of inherited disease in the puppies. It doesn’t get rid of that chance completely.

Knowing what testing does and doesn’t catch helps you ask better questions and have realistic expectations.

When you start looking at breeders, you’ll see phrases like “fully health tested parents” or “all clearances done.” That’s a good sign. It also doesn’t mean what most people think it means.

What does “health tested” actually mean?

There are two main kinds of testing, and they answer different questions.

• Clinical tests check the parent dog itself. A vet looks at x-rays, listens to the heart, checks the eyes, feels the kneecaps. These exams catch problems that have shown up in that specific dog.

• DNA tests check the parent's genes. They can tell you whether a dog carries the gene for a particular disease, even if that dog seems healthy. These tests are for diseases caused by one specific gene,

DNA testing is as close to a guarantee as we have. When both parents test clear, the puppies are clear for that disease.

Both are useful in different ways. Together they cover more ground than either one alone, but they don't cover everything.

Why can two health tested dogs produce an unhealthy puppy?

A few reasons.

Clinical tests show what’s happening in the parent today, not what’s hiding in the genes.

A dog with normal hips can still pass on the kind of genes that affect hip development. Hip dysplasia, like many common health problems in dogs, isn’t caused by one gene. It’s created by many genes working together (“polygenic”) and shaped by environment.

DNA tests only cover the diseases scientists have figured out. New ones get identified every year. A dog cleared for everything available today might carry something we’ll learn how to test for next year.

And some common problems, like most cancers, allergies, and complex heart disease, don’t have a DNA test that can rule them out.

What should I look for in a breeder?

Testing should be the starting point, not the whole story. A few things that point to a thoughtful breeder:

• They can explain what they tested and why. Not just “all clearances done,” but which tests, on which dogs, and what the results were. OFA results are public, and good breeders will point you to them.

• They talk about their dogs’ families, not just the parents in front of you. What problems have shown up in relatives? What are they breeding away from? Health history across generations matters more than one dog’s certificate.

• They follow up on puppies they’ve placed. Breeders who stay in touch with families learn things they can’t learn any other way.

• They’re honest about risk. A breeder who tells you “this is what we test for, here’s what testing doesn’t catch, here’s what we’ve seen in the line” is giving you the real picture. A breeder who promises a healthy puppy is overpromising, no matter how much testing they’ve done.

What questions should I ask?

A few worth bringing to the conversation:

• What clinical tests did you run on the mom and dad, and where can I see the results?

• What DNA tests did you run, and what came back?

• What health problems have shown up in this family of dogs, including in puppies from past litters?

• What’s your health guarantee, and what does it cover?

• How do you stay in touch with families to learn how the puppies do over time?

The answers, and how comfortable the breeder is with the questions, will tell you a lot.

Frequently asked questions

If the parents passed all their tests, why isn’t the puppy guaranteed healthy? For some specific diseases caused by one gene, when both parents test clear on a DNA test, that disease really is ruled out for the puppies.

But many of the bigger health problems in dogs, like hip dysplasia and most heart disease, aren’t caused by one gene. They come from many genes working together along with environment, and there’s no DNA test that clears a dog for them. For those, testing lowers the risk but doesn’t take it to zero.

Is DNA testing better than clinical testing? Neither is better. They answer different questions. Good breeders use both where they’re available and relevant to their breed.

What if a breeder says they don’t need to test because their dogs have never had problems? That’s a reason to ask more questions. Many inherited problems don’t show up in the parent and can still be passed to the puppies. Testing is how breeders find out what they can’t see.

Can I see the test results myself? Yes, and you should. OFA results are public at ofa.org. DNA test results can be shared by the breeder directly.