The moral difference is that horses will go to war with me, whereas cows are milk and steaks on the hoof.
Horses are soldiers, cows are food.
The cow doesn't know what you are and doesn't care, the horse recognizes you as commander.
The moral difference is that horses will go to war with me, whereas cows are milk and steaks on the hoof.
But useless for war. Pigs are smart, but they do not fight wars for you.
Same with chimpanzee troops, in fact, horse troops are reliably predictable second only to dog troops.