Barbie has a pooping pet! From this site:
Barbie doll has a dog named Tanner who is just like a real dog! Tanner is soft and fuzzy and her mouth, ears, head and tail really move! You can open Tanner dog’s mouth and “feed” her dog biscuits. Comes with a dog bone and chew toys that Tanner can hold in her mouth, too. When Tanner has to go to the bathroom, Barbie doll cleans up with her special magnetic scooper and trash can. Posable Barbie doll included.
You can see the toys in action here by clicking on the picture of Barbie and Tanner, or learn more here.