Have you become increasingly nervous that your pet door is an open invitation for little critters as well as larger intruders? It may be time for an electronic pet door. With an automatic pet door, you can have the option of who comes in and who goes out.

An automatic pet door can sense a collar key on your pet's collar when your pet is approaching, unlocking immediately. And if you want your pet to come in for the night but not be able to go back out, an electronic pet door can control your pet's access in both directions by your adjusting a simple setting.

A larger electronic pet door is not recommended to be near a bedroom because of noise while a smaller automatic pet door is said to be nearly silent, so this is something you'll want to investigate before going through the trouble of installing it and ruining your door or wall.

While an automatic pet door will help keep out little critters who don't belong, you may not find a 100 percent guarantee from pet door companies because they know as well as you do just how crafty they can be. But if your pet is the only one with a collar key, the smart bet is on your new electronic dog door.