I’ve had a 10 year old shih-poo since he was 8 weeks old. I noticed his back legs were very stiff and sore. I purchased drops for arthritis from the vet which were very costly and after a month or so saw no results. I heard about SierraSil and within 3 weeks of use, my dog was walking as good as new. The chews are truly a miracle. I recommend them to everyone who has a pet who suffers from arthritis as well as people themselves.