Grain, ruminant animal by-products and any other human junk food that is really high in energy and protein.
Not too dangerous unless the herd is running in your direction and there is nothing to stop them, unless of of course we are talking about non-domestic cows, in which case, they can be more dangerous than their domestic cousins.
Cows actually do not make food. Humans are responsible for that sector of the economy.
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 same type of food that all other cows eat.
the probing of cows
Yes, it is extremely dangerous. It causes photosensitivity and possible liver damage
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
Hay.
No, they are herbivores.