The look Wilford gives Cassidy is very much the sort of look someone who is suspicious of monsters in the closet, because it is a thing where they are from would give someone who's about to admit to being a monster they might one day find in their closet. Even on Wilford's twelve-year-old face, it comes across very plainly.

"Depends on what you're about to say."

He can rule out one thing, only because his dog hasn't tried to rip Cassidy's throat out. But that's just one thing of very many.