started using bettalife for my lurcher about 2yrs ago. She would yelp and cry out whenever she got up from laying down. This stuff is amazing, no more yelps or struggling to get up. Bought it from amazon the first time but now signed up to receive from company. the delivery is very quick and you earn points that you can use against your purchase. Have recommended to a few people who have either slightly older dogs or lurcher greyhound owners. 10/10