Electronic and magnetic dog doors
Electronic dog door will remain shut as long as the dog comes close to it. The door mechanism works when the electronic infrared censor can trigger of the dog movement when it comes close to the door then the door will open. Meanwhile the magnetic type triggers the signal from the dog collar to let the door open. These two types of dog door are generally expensive but they are very effective and you can make sure that only you cats and dogs can come into the house. However, there are some people attached the magnetic dog door to the house security alarm, which will help you to increase overall security of the house.
