My Springer Spaniel, Riley, has always loved being outside and especially playing ball. She and my son would play for hours. So when she started to slow down (at age 14) we were concerned. She seemed depressed. An x-ray showed that she had severe arthritis. We started her on the NatrixOne and noticed positive results in a week. She has now been on it about six weeks and it is like she has gone back in time. It makes me so happy to see her run after her tennis ball and bring it back to us all wet and dirty! She still is 14 and sleeps more than she used to however, her quality of life has definitely improved. I am really pleased with this product and the great customer service that NatrixOne provides. I actually have to say to people – no I am not selling it, I just love the stuff.