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. You are never suspicious of a dog's dreams.
Dogs understand what NO means.
Dogs understand if some of their friends can't come inside. Middle aged dogs don't feel the need to abandon you for a younger owner. Dogs admit it when they're lost. Dogs are color blind. Dogs aren't threatened if you earn more than they do.