Holstein CowSchleich 13797 Holstein Cow. Cows can't understand human language, but they can distinguish between a friendly and an unfriendly tone of voice. They can also tell from the tone of voice whether someone is serious and sincere. Cows show affection by licking each others' heads, shoulders and backs. If they are separated from their friends, they often get stressed and sad. It's not difficult for cows to tell each other apart: they have unique voices and