They expect you to cater to their every whim. They are moody. They leave hair everywhere. They drive you nuts and cost you money. They are tiny little women in fur coats.
Dogs lie around all day, sprawled on the most comfortable piece of furniture in the house.
They can hear a package of food opening half a block away, but don't hear you when you're in the same room. They can look dumb and lovable all at the same time. They growl when they are not happy. When you want to play, they want to play. When you want to be alone, they want to play.