Let's face it, we've all wondered how CatDog goes to the bathroom. Well, Nick Rewind has gathered some pretty, uh, interesting theories. Which theory do you think is correct? Tell us below or come up with one of your own!

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The NickRewind channel is the OFFICIAL home of your favorite ‘80s, ‘90s, and ‘00s cartoons and shows. That’s right—we’re talking all of your slimecovered Nickelodeon childhood dreams come true! Tune in every Monday, Wednesday, and Friday for exclusive digital content from all of your throwback favorites like Rugrats, Hey Arnold, iCarly, Victorious, Kenan & Kel, CatDog, Doug, Rocko’s Modern Life, The Amanda Show, Clarissa Explains It All, Ren & Stimpy, Are You Afraid of the Dark, and so much more!