[pink66]

I have heard from different sources that doggie doors are very unsafe. Small dogs have been killed trying to use them. I hate to be the bearer of more bad news, but most vets also recommend never letting pets under 10 pounds outside without a person right there with them. Even in a fenced yard there are too many dangers for a pup like a Yorkie-other animals, birds of prey, not to mention thieves.
We have a great backyard with privacy fence all around-the yard was a big consideration when we bought it because we wanted something our pups would love. For our 90 pound lab mix its great, but our Yorkie doesn't go outside unless she's wearing her harness with a long leash and a person right there at all times.
It can be easy to forget how very fragile these babies are.