WALKER, Mich. (WOOD) - Dogs who received the first in-clinic stem cell therapy in West Michigan returned to the vets who treated them Monday morning.

Boris and Natasha returned to Kelley's Animal Clinic for their 60-day checkup after receiving stem cell treatment in December 2011.

Dr. James Kelley and his staff of vets removed fat tissue from the dogs and activated it with an enzyme before injecting it into their back legs.

This adult animal stem cell technology is different from the controversial embryonic stem cell therapy.

Kelley said both dogs are doing amazingly well and that the procedure has done more than just help their arthritis.

"We're finding that not only the joints are affected, the rest of the animal is affected as well," said Kelley. "The skin is better. The attitude in these dogs is much improved."

Kelley and his staff have done 16 stem cell treatments since the first on Boris and Natasha, and he said all the dogs are showing signs of improvement after a short period of time.

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Dogs who got stem cell therapy are well