Vitamins for your dog

Are extra supplementary vitamins really necessary for your dog? If your dog is eating a well balanced diet then I would say no. Most vitamins for dogs are just overkill on the part of the dog owner. It is very rare that a dog would be suffered from a vitamin deficiency and still be well fed. The only time a dog would need vitamins is when it is on the verge of starvation, but even then the dog should be given a balanced diet to combat the malnutrition and the food would have all the vitamins the dog would need.