A randomized, placebo-controlled study in 74 dogs with arthritis shows highly significant improvements following a single injection of cultured allogeneic stem cells.

The strongest evidence yet!  This prospective, placebo-controlled randomised study shows highly significant improvements in the signs and symptoms of canine OA following a single injection of cultured allogeneic stem cells.

A Prospective, Randomized, Masked, and Placebo-Controlled Efficacy Study of Intraarticular Allogeneic Adipose Stem Cells for the Treatment of Osteoarthritis in Dogs. 

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5025432/