It Allows Felines to Enter and Exit the House
Puzzle 8 of Baking a Cake Hard Pack
Question is: It Allows Felines to Enter and Exit the House
and the answer is: CATFLAP
Word Meaning:
CAT FLAP — A small, hinged panel, usually cut into a door, with an opening just large enough for a cat to enter.
Definitions from Wiktionary.