Stem Cell Therapy for Dogs: What the Research Says (2026)

Pets · By the Regenerative Treatment Guide Editorial Team · Updated October 1, 2026 · 8 min read

The short answer

Small randomized trials in dogs with hip arthritis have found less lameness and pain after stem cell injections. But no stem cell product is FDA-approved for animals, the studies are small, and it is not a cure, a substitute for ligament surgery, or a cancer treatment. For the full picture, including PRP, see our guide to regenerative medicine for dogs.

Why we built this guide: Rocco’s story →

How stem cell therapy for dogs works

Most canine stem cell treatments use mesenchymal stem cells (MSCs). In the most common approach, a vet takes a small sample of fat from the dog under sedation, the cells are processed (sometimes in-clinic, sometimes at an outside lab), and they are injected into the arthritic joint. Some products instead use cells from a donor dog, which avoids the fat harvest.

MSCs were once pictured as rebuilding cartilage. Today the leading explanation is that they mainly calm inflammation and send signals that help the joint environment — which is why the benefit researchers measure is usually less pain and lameness, not new cartilage on an X-ray.

What the trials found

Black et al., 2007: a randomized, double-blinded trial in dogs with hip arthritis. Dogs given cells from their own fat had better lameness scores, and better combined pain and range-of-motion scores, than control dogs. The authors describe it as the first placebo-controlled trial of stem cell therapy in dogs.
Maki et al., 2020: a double-blind pilot in 20 dogs with hip arthritis using donor cells. Treated dogs improved by about two lameness grades on average, 65% were improved at 90 days, and there were no serious side effects. Only four dogs got the placebo, so it is an early signal.
The overall picture: a 2021 systematic review found six studies of stem cell injections in arthritic dog hips — only two randomized — that all reported improvement but were too different to combine. a 2021 review noted that owner- and vet-reported improvement is more consistent than imaging and gait results.

Several of these studies involved companies that make stem cell products. That doesn’t make the results wrong, but it is one more reason to treat them as promising rather than settled.

Wondering if your dog could be a candidate?

Answer a few questions about your dog. Free, no obligation.

Start the Free Dog Assessment

Is it FDA approved?

No. The FDA Center for Veterinary Medicine states that no animal cell or tissue-based products are FDA-approved. Some veterinarians still offer stem cell treatments, so it’s worth asking exactly which product your vet uses and how it is prepared. The FDA’s Q&A for pet owners explains the risks and suggests considering FDA-monitored clinical studies.

Is it safe?

In the canine trials above, serious side effects were uncommon. The practical risks are the ones that come with any joint injection and sedation: temporary soreness or lameness, and the small risks of anesthesia and infection. FDA also lists disease transmission and allergic reactions as possible risks of cell-based products.

Not a cancer treatment. Stem cell and PRP therapies are not treatments for tumors or cancer in dogs, including brain tumors, and no evidence supports using them that way. Research on how stem cells interact with tumors is mixed and still early. If your dog has been diagnosed with a tumor, talk with your veterinarian or a board-certified veterinary oncologist (you can search for one on VetSpecialists.com).

Stem cells vs. PRP vs. other options

PRP uses the dog’s own concentrated platelets instead of cells and has its own small trials in arthritic dogs. Approved options include anti-inflammatory medications and Librela, a monthly injection for arthritis pain that the FDA approved Librela (bedinvetmab) in 2023. For a torn cruciate ligament, the American College of Veterinary Surgeons considers surgery the best treatment. Our regenerative medicine for dogs guide compares these in more detail.

What does it cost?

Prices vary widely and we haven’t found a reliable independent price range, so we won’t quote one. Ask for a written estimate covering sedation, harvest, lab processing, and follow-up injections, and check with your pet insurer first.

Questions to ask your vet

Has arthritis been confirmed with X-rays, and how advanced is it?
Will you use my dog’s own cells or donor cells, and who processes them?
What improvement is realistic, and how long does it usually last?
How does this fit with weight management, exercise, and medication?
What is the total cost, including any repeat injections?

Frequently asked questions

It is an injection of mesenchymal stem cells, usually collected from the dog's own fat or from a donor dog, into a painful joint. The cells are thought to work mainly by reducing inflammation and sending healing signals, not by regrowing cartilage. It is most often used for arthritis.

In small randomized trials of dogs with hip arthritis, treated dogs had better lameness and pain scores than control dogs, and one pilot study reported 65% of treated dogs improved at 90 days. The studies are small and short-term, so success rates for an individual dog cannot be promised.

The canine trials reported few serious side effects, though some dogs are briefly sore or lame after a joint injection, and the procedure usually needs sedation. The FDA notes possible risks such as infection, disease transmission, and allergic reactions. No stem cell product is FDA-approved for animals.

Usually not. For a torn cruciate ligament, veterinary surgeons consider surgery the best treatment because it is the only way to permanently stabilize the knee. Stem cell injections are mainly used for arthritis and are sometimes discussed alongside surgery rather than instead of it.

No. Stem cell therapy is not a cancer treatment, and no evidence supports using it for tumors in dogs. If your dog has been diagnosed with a tumor, talk with your veterinarian or a board-certified veterinary oncologist.

Explore regenerative options for your dog

Tell us about your dog in about 60 seconds. We’ll follow up when a veterinary practice offering regenerative treatments is available near you.