Definatley a dog, they get to lay around, sleep loads, roll around on the floor playing with their toys, act like winning the lottery whenever they see you getting ready to take them out and can just mount and fuck any other dog they like.
When Im up early for work and the dog gets up with me I envy him as I leave the house and he goes back upstairs to go back to sleep.
Here he is in his favorite place relaxing in front of the fire.