They say you can't teach an old dog new tricks, but with the Smart Pet Doorbell, you can teach him to ring whenever he wants in or out.

Those swinging pet doors can be okay, but back when I had a cat, I found it was only a matter of time before he was bringing in friends and throwing parties when nobody was home. Eventually we closed off the door, and simply let the cat in or out once he made enough noise. The Smart Pet door solves this problem with a tiny RFID tag that you attach to Fido's collar that rings a doorbell when he gets within three feet of the door.

After you get tired of jumping up to open the door, you could always toss Fido the key to his own bachelor pad.

The Smart Pet Doorbell is available now for about $90.

PetSafe, via Coolest gadgets