Doggie Doors...

[Lola's mum]

I'd be worried about burglars getting in my house if I had a doggie door

 

[MaryNJ]

I think they have doggie doors that require a transmitter (worn on the collar) to open.

But in any case, a burglar would probably run for his life if he came face to face with my Aladdin (who would have started barking before he even got near the door)!