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Pet door
A pet door or pet flap (also referred to in more specific terms, such as cat flap, cat door, dog door, or doggie door) is a small portal in a wall, window or human door to allow pets to enter and exit a house (or other structure) on their own without needing a person to open the door. Originally simple holes, the modern form is a hinged and often spring-loaded panel or flexible flap, and some are electronically controlled. They offer a degree of protection against wind, rain, and larger-bodied intruders entering the dwelling. Similar hatches can let dogs through fences at stiles. A related concept is the pet gate, which is easy for humans to open but acts as a secure pet barrier.
==Purpose==
A pet door is found to be convenient by many owners of companion animals, especially dogs and cats, because it lets the pets come and go as they please, reducing the need for pet-owners to let or take the pet outside manually, and curtailing unwanted behaviour such as loud vocalisation to be let outside, scratching on doors or walls, and (especially in the case of dogs) excreting in the house. They also help ensure that a pet left outdoors can safely get back in the house in the case of inclement weather.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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