He Didn’t Like Cats, published in 1942 in Unknown

“He Didn’t Like Cats”
by L. Ron Hubbard

Publication date: February 1942

Original publication: Unknown Worlds

Genre: Fantasy

Story description: A civil servant unleashes his frustrations on an ally cat, sending it to a gruesome death—with retribution coming in the form of an endless recurring nightmare.

Currently available as part of the Stories from the Golden Age series, in the title Danger in the Dark.