We buy most of our supplements from the Horse department, so much cheaper and in larger quantities. we have just started buying treats for horses made from grass and containing Glucosamine and Chondroitin, the dogs love them, the omega oils we buy for about half the price of the doggy stuff from the pet shops, and we make many of their treats and build up foods if they require it by adding molasses also bought from the horse shop. Just be a little careful, just because it is suitable for horses doesn't necessarily mean it is good for dogs.