I like the way horses smell--like hay. Some people like puppy breath. I've never experienced that because we usually get our dogs as a result of an unknown entity dumping them. All we do is wait--the Creator takes care of the rest. (Some of us are lazy. Crowbar came with more than minimal obedience training. He doesn't always take us seriously, though.)
Horses smell like warmth and horsy stuff. I love the velvet noses and the feel of their backs beneath my backside when I ride bareback.
As for cows, well, they just smell like cow pies.