My dog has been on this for years now.  She is a Mutt and 4 years old.  She has always had the extreme "butt shake" when she's excited, due to the oddness of her hip build.  This keeps her moving.  She avoids pills in her food at all costs, but likes this.  She licks the bowl clean.  It seems like a lot of powder for the size, but as long as she likes it and i'm not forcing it into her it's worth it.