I watched this today on TCM. One of my favorite sci-fi movies (and isn't Tom Tyron a really gorgeous monster-husband?). Anyway, I wanted to mention another Stuff To Watch For
which is before the cat's death. Marge buys her husband, Bill, a cute little dog. The dog growls at Bill and so they decide to KEEP IT TIED UP IN THE BASEMENT
Of course, the poor little furry prisoner is killed.
Dogs really had it tough in 1950's horror or sci-fi films.