Furry characters co-existing with normal, non-anthropomorphic animals - an infamous example being Goofy and Pluto.
Coincidental background wildlife such as bugs and most birds do not by themselves qualify, unless featured with anthropomorphic characters of the same species or they're a main focus of the image. It also does not usually apply to canonically anthropomorphic Pokemon such as Lucario being pictured with a non-humanoid Pokemon.
The characters also have to be interacting or at least existing in the same space, not simply being drawn on the same canvas.
Sometimes humorously focused on, especially in the case of a furry character having a pet.
