These three are especially necessary. Linoleic acid is found in vegetable and animal fats. Linolenic is found only in oils and arachidonic acid is found in some animal fats. If you dog doesn't get enough of the fatty acids in his diet, physical signs will be present. You may notice changes in skin condition, nervous system and resistance to disease.
Carbohydrates are a super source of energy.
They can be found in green plants or vegetables as sugars and starches. In dog foods, carbohydrates come in the form of fiber or bulk. Vitamins and minerals are needed to promote growth. Calcium provides your dog with good, strong teeth and bones. Iron is needed for red blood cells.