Zander's hips are stiff these days. Little exercise usually works it out, but I'm coming to terms with the fact that my boy is getting a little creaky at the age of 8. I've heard of Cosequin, Missing Link, and a few others, but I wanted to get a bigger feedback/review basis before I grabbed something off Amazon. These things are pricey. Tried plain glucosamine before, but it didn't do too much.