Probably spent so much time with cows, it was a foreign concept to see 'em standing and acting human. I spent enough time around cows in my youth, I came to detest them. I don't like pigs, either, or goats. Horses are okay, if they don't try to bite.
I think I have all of Larson's panels in a collection of his books. It's fun to go back and look through them again every so often. His and Patrick McManis' books are good ways to get away for a while.