I've only been using the vitamins for a couple of weeks, but they seem to be helping my beagle quite a bit. And they are definitely much cheaper than getting it directly from my vet's office!
This comes highly recommended from my Vet for my dogs, they seem to love it and it is sticky.. I just add it to their food with a little water, they drink it right up. Saves me some money buying in the gallon container.