TheDoorLatch Childproof Cat Door Stopper – Keep Dogs & Kids Out of Cat Litter Box, Food, or Rooms – Door Latch, No Need… Price: $23.99 (as of 12/06/2022 22:56 PST- Details) & FREE Shipping.

NO CUT cat door. Opening Is Adjustable Between 3.5″ and 4.5″
Effective against persistent dogs and toddlers. Simple Springy One-Handed Operation
Won’t rip the paint off of your walls and doors. All fasteners are hidden.