Cartoon Dog

 Cartoon Dog  is a creature created by Trevor Henderson and, along with Cartoon Cat, the only known member of the Cartoon Monsters species.

Appearance
Cartoon Dog appears so far in only one confirmed image. In said image, Cartoon Dog is presented as a cartoonish dog with floppy ears. Its legs and arms appear to be swapped.

Trivia

 * At first it was unknown whether Cartoon Dog was another form of Cartoon Cat or a separate entity. Trevor eventually confirmed that they are two beings of the same species.
 * However, in a list of canon creatures made by Trevor himself there's a "?" next to Cartoon Dog's name, implying that Trevor himself is unsure whether Cartoon Dog is canon or not.