Giving your dog a dog vitamin supplement is important to canine health. Since dogs have a high activity level, it is crucial to keep their bones strong with the help of vitamins. There are numerous canine supplements on the market, though some are better than others. Types of Vitamins Essentially, there are two different types of vitamins available. These two types include fat soluble vitamins and water soluble vitamins. Fat soluble vitamins are stored in the liver and tissue, and these vitamins should only be used if certain symptoms develop such as poor skin or a drab coat. Water soluble vitamins are needed every day, and these vitamins should be added to your dog's diet. Required Water Soluble Vitamins Those water soluble dog vitamin supplements that should be taken ever day include Vitamin B1, Niacin, Vitamin B2, Vitamin B5, Vitamin B6, Folic Acid, Vitamin B12, and Biotin the Drs. Foster and Smith brand multivitamin contains all of these essential vitamins with a single dose. Vitamins According to Dog's Age Younger dogs will require a different vitamin mix than older dogs will. Choose the right multivitamin according to your dogs size, weight, and age.