Dogs feel guilty when they have done something wrong. Dogs don't criticize your friends. 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.