I started using this 2 months ago on my lab. He was limping really bad. The Xrays were negative. We were thinking about taking him for an MRI but it cost so much and we did not have the money. So I researched the internet for something to help him. I saw the reviews and decided to give it a try since I take Standard Process supplements and have had good results with them. Well it took about a month but he has improved alot. If he one that leg alot and runs around he will be a little sore but not like he was. I also give him Glucosamine tabets too which I did before without the Canine powder and the tablets were not helping much. So I know it is the SP that is helping. I just purchased another bottle and will keep giving it to him for a month then start to taper off to see how he does.