cat flap, pet door, pet flap

Pet door - Wikipedia, the free encyclopedia

https://en.wikipedia.org/wiki/Pet_door

A pet door or pet flap is a small portal in a wall, window or human door to allow pets to enter ... The Oxford English Dictionary records the first use of the phrase "cat flap" in 1957 and "cat door" in 1959, but the idea is much older. A gatera (farm ...

Tate
Did you know... when Turner’s cats needed to exit his studio, he decided to cut a hole in this artwork and use it as a cat flap? 🐱

See the (repaired) canvas now on display at Tate Britain:http://ow.ly/o7sY303Nnrx

Joseph Mallord William Turner, 'Fishing upon the Blythe-Sand, Tide Setting In', exhibited 1809⠀⠀