Written by
Pet DNA testing is trending. A vet explains what it can reveal (breed, genetic disease risk, MDR1 drug sensitivity) and what it can't, plus how to make the results truly worthwhile.
Pet DNA testing is having a moment. Before you decide, as a veterinarian I want owners to clearly understand what it "can" and "can't" tell you — so you get the most out of it.
For mixed-breed pets, testing shows which breeds are in the mix — which relates to adult size, baseline temperament, and care needs.
This is the most medically valuable part. Testing can screen for risks inherited in certain breeds — kidney disease, heart conditions, or hip dysplasia — so we can monitor early.
Some dogs — especially herding breeds (Collie, Australian Shepherd, Shetland Sheepdog) — carry an MDR1 (ABCB1) mutation that causes severe sensitivity to certain drugs such as ivermectin, loperamide, acepromazine, and some chemotherapy agents. Knowing in advance lets your vet choose medications and doses far more safely. Even mixed-breed dogs with herding ancestry should be tested.
The key is to discuss the results with your vet to design a screening, diet, and exercise program matched to your pet's specific risks — not just file the report away.
A DNA test isn't a magic crystal ball — it's a powerful roadmap for health care. Combined with love and consistent care, it helps us know our pets more deeply and care for them precisely, for a long and happy life.
1. Can cats be DNA tested too?
Yes. There are cat-specific kits that reveal breed, coat color, and certain feline disease risks.
2. Is pet DNA testing painful?
Most use a simple cheek swab or saliva sample — easy and painless.
3. Do I need to re-test as my pet grows?
One test is enough for life — genes don't change — so it stays a useful reference.
