The thing about Lovecraft's work is that he did write about some genuinely fucked up critters, but he doesn't seem to have had a clear picture of which ones those are. "Dog that inhabits right angles" and "sapient colour" are treated as exactly as mind-bending as, like, "guy who looks like a fish" and "big penguin".
The idea that all of existence is a fictional dream of a sleeping god creature from an entirely different reality that could wake up at any moment, ending all life that never truly existed at all, is a fascinatingly terrifying concept but the god is not nearly as popular as the Really Big Guy who is Squid
To be fair the hounds of tindalos are a great example of what we like to think Lovecraftian means because they're never actually described like dogs or described at all, they're "hounds" in the sense that they track some kind of quarry for some kind of master. The only other thing known about them is that they can travel through right angle corners, so you have a guy who knows he's marked and he spackles every corner he can find until it's like he's living in a giant egg, and everyone thinks he's just "crazy" until the spackling gives out and he poofs out of reality.
There's great mind bending horror there that doesn't rely on knowing what the monster is or what it looks like, but the unexplainable mechanisms by which it operates and what that can do to the mind of someone living all alone with a fear no one else can accept.
But then, yeah, there are also the Lovecraft stories in which the threat is "what if big limpets could read."

























