

Food and water 
Make sure fresh water is always available at home. Try to choose a quality
dog food that well meet your dog's nutritional needs. Dogs need different
amount of food according to their size, age, and daily exercise. Treats
are also very helpful for training, rewards or as snacks between meals.
Just make sure to avoid obesity.
Here are few essential nutrition dog needs
Protein
Protein, a source of energy, is an essential nutrient and help your
dog with muscle growth, tissue repair, enzymes, and immune functions.
Carbohydrate sources
Carbohydrate sources are sugars, starches and dietary fiber. The primary
function of carbohydrate is to provide energy.
Fat
Fat, a concentrated form of energy, is needed as a source of essential
fatty acids.
Fatty Acids
Dogs require essential fatty acid that is defined as one of the "omega-6"
fatty acids. These fatty acids are found in vegetable oils and animal
fat. They help regulate the blood flow to body tissues, immune system
and maintain healthy skin. Omega-3 fatty acids is another important
class of fatty acids.
Minerals
Minerals have different functions in the body, including bone formation,
enzymatic reactions, muscle and nerve function, and the production of
hormones. Various type of minerals are Calcium, Sodium, Potassium, Iron,
Zinc, Copper, Magnesium.
Vitamins
It is very important to provide balanced amounts of vitamins and other
nutrients in complete diets.
Vitamin A: vision, growth, immune system, reproduction
Vitamin D: mineralization of bone, increase the absorption of calcium
Vitamin E: reproduction
Vitamin K: a clotting agent within the blood