Ruby

Ruby is a dog that Kevin adopts in the episode Fundraiser. Kevin describes his new pet in great detail, talking about how she smells terrible and never seems to do anything but lie around all day without eating, barking, pooping, or even opening her eyes to watch TV. The rest of his coworkers collectively come to the conclusion that Ruby might be deceased, but the end of the episode reveals that Ruby is indeed alive, and is simply extremely passive.