TheDoorLatch Automatic Cat Door Strap and Latch, Heavy-Duty Stainless Steel Door Holder for Keeping Dogs and Kids Out of… Price: $21.97 (as of 03/23/2023 16:34 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.