There are hundreds of products out there I am going to give you two of my favorites.

Products vary in form,some are powders some are tablets my pets love to eat their supplements either way. 

Nuvet offers tablets and powder for dogs and powder for cats.  Everybody is different and because of this you have a option or your pet has a chose instead of having to settle.  I know most of you still have medication bottles or some form of product for your pet in the cabinet never going to be used because its hard to get them to take it.  This is a common problem, but now you have a solution.  Nuvet offers samples and a money back guarantee on their products.