@Unraveler  

@Background Pony #5907  

@PoniesRUs  
Here’s how I think it could work: Both halves have their own digestive systems leading to the same excretory system in the middle.

@PoniesRUs  
In one episode, Cat said that they share the same colon.

@Background Pony #72CE Pony centipede

Worst Harlan Ellison story ever.

I’m assuming they go to the bathroom the same way CatDog does. And that’s something people have been wondering about for 17 years.

Do you often poop in your dreams?

Meanwhile, elsewhere:  
 
XD

Well,there is still an hole on the other end…but it belong to someone else…
 
!
 
OH GOD!!!!