Here are a few of the best dog vitamins and supplements, formulated to help your pet live a long and thriving life. The best dog vitamins: Reviews & RecommendationsZesty Paws 11-in-1 Bites These premium soft-chew multifunctional supplements are for adults and seniors of all breeds. An Amazon bestseller, this is one of the best dog vitamins you can find on the market. The best dog vitamins come in many different forms—chews, powders, pills, drops—so consider what will be easiest for you to administer and for your dog to ingest. The best dog vitamins that won’t break the bankGenerally speaking, dog vitamins are quite affordable, costing just a few cents per pill or per serving when you break down the economics.