* AwesomeMusic: The theme song, which is often considered the best part of the show. Even people who ''hate'' the show agree that it's good.
* DarknessInducedAudienceApathy: Due to being a SadistShow, though this possibly invoked on purpose since the creators made the show to "really play off of kids sympathies."
* DudeNotFunny: Cat is always the one who suffers the most from his crazy friends/enemies, but especially Dog's dog-like antics. It's even sadder how Dog just watches as his brother is brutally skinned alive several times without doing anything.
* EarWorm: ''Cat-Dog, Cat-Dog! Alone in the world is a little Cat-Dog!''
** "A pretty little piece of paradise / That's a-where I wanna be..."
** [[http://www.youtube.com/watch?v=kP4Yv5_dwx4 "Parents / That's right, parents / Tall, short, wacky, wiggly parents..."]]
** Cat diggety dog! (Cat diggety dog!) Dog diggety cat! (Dog diggety cat!)
* EnsembleDarkhorse: Lola.
* FridgeBrilliance: The third line of the theme song nearly 100% references their adoptive parents.
* FridgeHorror: How does [=CatDog=] go to the bathroom?
** Some episodes imply there's an anus in the center of their body. [[{{Squick}} Which is still quite unsettling]], though considerably less so.
** FridgeBrilliance: That's roughly where their respective hindquarters would be if they were a regular cat and dog, so it makes sense.
* HilariousInHindsight: In "Guess Who's Going to Be Dinner!", Cat says of the blue-furred Winslow, "I could make a rodent WesternAnimation/{{Ratatouille}}."
** "I predict that the trees will speak Japanese." Years later, [[VideoGame/PokemonGoldAndSilver Sudowoodo]] was introduced.
* JerkassWoobie: Cat, though sometimes he's just TheWoobie.
* LoveItOrHateIt: Either this show was a good show that never got its due or a crummy show that signaled the beginning of the end for great Nickelodeon programming.
* MoralEventHorizon: Cliff's biggest [[KickTheDog Kick the Cat Dog]] moment has to be in ''The Great Parent Mystery'' when he mocked them for not having parents.
* MemeticMutation: "How does CatDog go to the bathroom?"
* NauseaFuel: It's a GrossoutShow. Expect quite a bit.
* TheScrappy: Winslow and Rancid Rabbit appear to be this, since they almost always ruin [=CatDog=]'s day - in Winslow's case, mostly because he's a complete dick. For Rancid his recurring appearance and mean attitude is seen to be annoying.
** Cliff of the Greasers, as well. Shriek is more of a BaseBreaker, as she has a few good moments with Dog, and Lube averts this, due to having a few episodes in which he is not an antagonist (and a lot of other instances of being too stupid and ineffectual to be malicious otherwise). Cliff, however, is just a JerkAss (though to compensate, he arguably has the most frequent moments as TheChewToy).
** There are quite a few fans who hate Lola, some even comparing her to Scrappy-Doo.
** Eddie the Squirrel. His [[SmallAnnoyingCreature grating personality]] and unbelievable [[SmugSnake arrogance]] makes him very hard to like.
* TheyWastedAPerfectlyGoodPlot: ''The Great Parent Mystery''. It had a lot of build up to it, and generated some interest into the identity of [=CatDog's=] parents. [[spoiler: Only it turns out that the [[SarcasmMode big]] [[TheUnreveal reveal]] was that we get to see [=CatDog's=] ''adoptive'' parents.]] One could imagine a few people being annoyed by this.
* UnfortunateImplications: The Greasers constant beatings of [=CatDog=], especially Cat reeks of racism and/or general prejudice.
** That ''may'' have been intentional, though.
** Indeed, one episode implies that they pick on [=CatDog=] because they're two-headed.
* ValuesDissonance: One of Winslow's lines directed toward Cat, which goes "How 'bout I sock you right in the puss[[note]]As in 1940s slang for "face"[[/note]], ''Puss!''[[note]]As in general slang for cat[[/note]]". They could get away with it in the 90s, but given the term's change in useage over the years, it's a miracle that this line was able to stay in on reairings.