In the most primal sense, cows get their food from the plants which naturally emerge and grow from the soil, because these animals are both herbivores and primary consumers. In the more modern agricultural sense, cows get their food from humans who harvest various "special" plants for them and feed these plants in their stored varieties called hay, grain or silage out of containers such as bale feeders, feed troughs/feed bunks, or mangers.
Cows actually do not make food. Humans are responsible for that sector of the economy.
The same type of food that all other cows eat.
Cows can get food on their own when they are out on pasture. The act to which they are able to do so is called "grazing."
the probing of cows
Cows make milk from eating grass.
Cows and dogs have different feedstuff requirements, thus there is no one food that contains vitamins (or any other nutrient) for both cows and dogs.
No.
the cows digestion takes 8 hours to digest the food or cud
Digesting food.
Hay.
Food Production
No, they are herbivores.