Dog doors for back door?

I have one, put it in myself. I'm not going to lie and say it was easy, but it took no longer than 3 hours start to finish. I have a wood back door, so all I had to do was measure it out, cut the hole and screw the thing in place.

It's so great! It's insulated so it doesn't let too much heat out and it has a little transmitter that attaches to my dog's collar. When he gets close to the door, it unlocks. I like it b/c my dog can go in and out when I'm at work, plus it's relatively safe with the locking thing. Emphasis on the "relatively", it's not exactly iron bars.

I bought it online at drsfostersmith.com. There are many types. Hope this helps.

thanks Uncle Lisa!
I had no idea they made ones that locked (and gave your dog the key), so I never even considered it. Of course, I don't live on the ground floor anymore . . .
(sigh)