One critter doggie door?

[Brian O]

I saw the movie "Over The Hedge". There was a dog that had a collar that would activate a doggie door that only a critter with the collar, and maybe a critter tagging along with it, could pass through, then it would lock again. I haven't seen such a device. Are there such things? And if so, do they work? Anyone that has used these, if you might chime in? Thanks.

-- Brian

[Grandpa]

It was a cat. But look at this:

they work.

[m Ransley]

Google, Automatic Doggy Door

[Tom The Great]

Or "electronic dog door"

tom @

[Pop]

Hmm, intersting. It's infrared though; too bad they don't make one using a radio signal - more reliable less prone to dirt/fur messing it up.

Any further sources?

Pop`

[RobertPatrick]

"Pop" wrote in news:46twg.6872$4a2.3949@trndny04:

company.

[Grandpa]

How about an ultrasonic activated Star Trek style?

You can Google for others on your time.