Electronic Pet Doors
Several types of pet doors that allow selective access are available. The advantages of this type of pet door over simpler models are improved weather resistance, and home security against strays and other unwanted animals. Some use a permanent magnet mounted on the pet's collar to activate a matching electromagnetic mechanism that unlatches the door panel when the magnet comes within range; several pets can be fitted with collars that match the same door. Pet doors with infrared locks open only when a collar-mounted device transmits the correct code to the latch's receiver, allowing owners to have multiple flaps that different pets can use, e.g. a small cat flap to the back yard and a large dog door accessing a dog run. Either type can be used to selectively allow one pet outside access, while denying it to one that does not have the necessary equipment (e.g., an ill animal that needs to stay indoors).
Some of the newest models use radio-frequency identification to electronically read a pet's microchip implant rather than the pet having to wear a collar that triggers the mechanism.
Read more about this topic: Dog Door
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