I use a spray from Petco called Joint and Hip Formula it's made by Pet Authority for my 9 year old Pom who has a hip problem.She's been on it for 3 weeks and it seems to have made a little difference. I use their Vitamin and Mineral spray for Cali. The website for Pet Authority is
www.pet-authority.com. I like the fact that is sprays on the food. It doesn't say anything on it about protein.