Dogs are color blind. Dogs aren't threatened if you earn more than they do. Dogs mean it when they kiss you. Men can buy you presents. Men don't have to play with every man they see when you take them around the block.
Men are a little bit more subtle.
Men don't hike their leg to pee on every post they pass. Men don't eat turds on the sly. Dogs have dog breath all the time. Men can do math. Men don't shed as much, and if they do, they hide it.