What is Pet door?
[[File:Cat flap.jpg|thumb|200px|A cat flap]] '''Pet doors''', also known as '''cat doors''', '''dog doors''', '''doggie doors''', or in the [[United Kingdom]], '''cat flaps''', are small doors for [[pet]]s. They are usually built in regular [[door]]s, but can also be in [[window]]s or [[wall]]s. They usually have the hinge on the top, with no [[latch]], so the animal can push their way in and out. Newer models sometimes only let the pet go outside, but not inside. Others have a latch and something that can be put on the pet that makes the latch open when the pet gets close to the door. They are most commonly used for pet [[cat]]s, but can also be used for [[dog]]s, miniature [[pig]]s, or other small pets. The pet door was developed by Isaac Newton. [[Category:Pets]] [[Category:Doors]] {{stub}}