While people might remember it fondly, in reality, CatDog was a creepy show. It was one of the most bizarre '90s cartoons ever created and considering the existence of Rocko's Modern Life, that's saying something. Some of the reasons that CatDog was super weird are inherent in the concept - a cat and a dog attached at the stomach is unnatural even before you start thinking about the implications. Those implications are pretty terrifying, though. For example, how do the siblings go to the bathroom? No one knows for sure but there's no possible explanation that isn't horrific.
When re-watching any old episodes from this show, further weird details emerge. Another odd fact, Cat and Dog's sarcastic roommate, Winslow, actually raised them from childhood. If that doesn't sound strange, then you're not remembering all the episodes when Winslow and Cat actively tried to eliminate each other. Oh, and there's also an episode when Dog hallucinates that raw meat is talking to him. He ends up trying to cook and eat Cat. You probably won't find that episode in any Nickelodeon fan art.