Dogs don't criticize your friends. Dogs admit when they're jealous. Dogs are very direct about wanting to go out. Dogs don't feel threatened by your intelligence. You can train a dog.
Dogs are easy to buy for.
Dogs understand if some of their friends cannot come inside. Dogs admit it when they're lost. Dogs are color-blind. Dogs aren't threatened if you earn more than they do. Where Dogs Fall Down Men only have two feet that track in mud.