These are neat, but I'm not seeing anything that makes it lock like a special collar or device to go on a collar. Now if the warning says a small child can pass through the door, what's to stop a medium sized burgler from considering that an open invitation to enter your house if you've got a giant like I do?
Bueller? Bueller?
Nah. Even if we go ahead and put in sliding doors instead of these French doors, I think I'll pass until there's a solution for that problem.
Sliding door inserts are an excellent way to see if a pet door is right for your pet and your lifestyle. Because there’s no cutting, there’s no commitment; if you or your pets don’t like the door, simply remove it and return it. (See our return policy)
Independence for you and your pet
Save effort letting in/out
No more planning your schedule around pet potty breaks
Never clean up another accident
Stops barking, scratching, whining at the door
http://www.petsafe.net/doors/sliding-door-inserts