My 12 year old cocker is on Yumove, and I've seen good results with this with one of my other dogs (who has now passed). They make one for younger dogs. Have a look on the Lintbells website. My working cocker who works through the season and does agility through summer is 4 now and he's not on any supplements as I don't see them as necessary in a young fit dog on a decent diet. I may start him on yumove when he reaches 6.