I have a doggy door on my screen door that Bella loves to use. I have been thinking of getting on for the main back door so she can come in and out when we are not there. Does anyone have that set-up? I am mostly worried that if she can access the back yard while we are not home then someone could take her. She likes to potty in the yard and takes herself back inside when she is finished, she doesn't like the portable potty. Maybe I need to get some real grass for it. Advice please?