You could have a lot of reasons for giving your dog vitamins starting from not having enough food to eat to your dog's having special nutritional requirements. Even if your dog is into raw food diet, it might still be in need of additional nutrients based on their particular breed. The older dogs are often in need of vitamin supplements since they don't usually eat as much food as they used to. This means that they may be lacking in several nutrients. The question remains: what vitamins do your dogs need? It can help you a lot if you know the kinds of vitamins and what they bring. Vitamin A for instance is good for the skin. This can aid in preventing flaky skin or itchy and irritable skin in your dog.
The best fish oil supplement for dogs is good for the dog's bones and teeth. There are certain breeds like golden retriever who are quite susceptible to arthritis and hip problems; vitamin D can help them. Vitamin E on the other hand is the antioxidant vitamin while vitamin K is the blood clotting vitamin. Vitamin B on the other hand is good for skin, blood, healthy muscles while vitamin C is meant as a stress buster and a good antioxidant too.
Some people have the tendency to argue that a top quality dog food will have all the vitamins and nutrients that your dog needs. Other people will simply tell you that it isn't really the case. The cooking process ingredients of pre-made dog foods go through may remove all the necessary nutrients in them. Majority of the dog foods may have all the average nutrients required for the dog but they don't usually have additional vitamins that can protect them against diseases. Learn more about dog vitamins at http://www.ehow.com/pets/dogs/dog-supplies/.
Vitamins also help in regulating your dog's metabolism. There are two categories for dog vitamins: one is water soluble which has to be replenished daily and the other one is the fat soluble vitamins. They are stored in the fatty tissue and the liver. They don't have to be replenished daily. Examples of these are vitamins A, D, E, and K. Know more about purina pro biotics.
All these dog vitamin supplements also have minerals in them. These keep the balance within the dog's body fluids. Your dog requires minerals like magnesium, calcium, sodium, and potassium. The minerals have to be taken with care since they all affect each other. You can also add more veggies to your dog food to ensure that they have enough vitamins from their food.