Call of Cthulhu

Seems legit, chihuahuas are eldritch-touched at the very least, if not outright interdimensional horrors!

Humor aside, I am a new keeper who would love to hear opinions on the situation in the meme from other keepers of any experience level. Wouldn't requiring a mythos roll instead of a natural world roll be mean in this case?

My thought is that the natural world result could range from "These prints are clearly from a dog," on a fail/fumble to "You cannot recognize these prints as belonging to any animal you've ever seen or heard of," on a success to "You don't immediately recognize these prints; on closer examination you feel a wave of dread wash over you. Not only do you not know what left these tracks, you get the sense that you shouldn't know, that no one should ever know, that the animal... no, the bloody thing that came through here should not even be, much less be known."