"We purchased this supplement for our male Chesapeake Bay Retriever. He is 9, almost 10, and he is starting to get "creaky". He is more active now on the stairs, playing ball & frisbee with my husband and he even wants to play with our female Chesapeake more often (hard feat-getting her to play with another dog). Just make sure that you feed this with their food....he vomits it back up on an empty stomach."