Genie, that's the same thing that was racing through my mind as I was reading your post!!
How did the little fellow get out??

We, like you, make sure Toto is safe before we go to the door. We had the air conditioning repairmen here most of the morning and since I knew they would be going in & out a lot, I put Toto in her pen until she had her breakfast and her "morning constitutional"! She was soooo funny, after ate, pooped & peed, she started talking in her "baby voice" & I swear she sounded like she was saying "Hey!" I went to check on her and she was looking puzzled, like "what am I doing in here ... you're here ... I'm supposed to be out there with you"!!

We took turns holding her until they were finished and gone!!

I guess I just assume that everyone is as over-protective as we are .... obviously not!!