
Animal Fats: While most animal fats contain just as many calories as vegetable oils, only two contain essential fatty acids in amounts sufficient to supply a dog's needs. These are the fat of the pig, commonly called lard, and horse fat. The tallow of beef and mutton should never be used as the sole source of energy for a dog because of their low content of essential fatty acids. Animal fats contain about 126 calories in every tablespoonful.Cereal grains: One of the major sources of carbohydrates, both for dogs and man, is the cereal grains. The useful carbohydrate in these grains is predominantly starch. Starch can also be purchased in pure...