Need help

Does anyone else have cats and dogs with a doggie door? Have you found a way to keep the cats inside? Mine have discovered the door and I am scared he will get into the road. So far so good but a couple times he went towards the road, once clear across. Mittens mostly stays on the deck in back maybe going down into the dog yard occasionally.

There are dog doors available that only open when an animal wearing a magnetic "key" on their collar tries to open the door. I found one site, here:

http://www.fancypaws.com/elpetdoor.html

I did an internet search using the words "dog door and collar". Perhaps you can find something that could help you.