Dogs of all ages can benefit from dog vitamins. Vitamins are required for bone growth, metabolism function, good vision, and they can also fight off infection and common conditions such as arthritis and heart disease. Learn about the essential vitamins your dog should have and how they affect his body. Also read about what vitamin supplements are harmful to your dog. Familiarize yourself with how to recognize vitamin deficiency in your dog and what you can do to help him get the health amount he needs.