Please get this: http://www.syn-flex.ca/allaboutglucosamine.html
and it will help the cartiliage grow, if it works you will notice in 2-4 days.
it's premixed and easy to use (depends on how picky your dog is, my dog loved it but my sister's dog didn't like it, but it's liquid and liquid is the best form and absorbs more. people take it with great results too.
let me know if you have any questions. it literally turned my sister's 15 year old arthritic and disc problemed dog into a puppy the first few days he was on it.