Pet doors have long been a convenient way to let your animals come and go without you having to open the door — but that convenience brings with it the security risk of having a literal hole in your door. The Staywell Infra-Red Dog Door ($180) removes this risk by way of a infra-red sensor and a key that is attached to your pet’s collar. When Sparky gets near the door, it’ll unlock and let him inside. Keep the convenience, lose the risk.