I just had a scare. I was taking Leena out to use the bathroom, and even though I am constantly tightening her collar, she wriggled loose (scared by a rolling garbage can... it's windy today). Luckily, I was able to coax her around the apartment to our door in the back by saying "C'mon, Leena, let's go!" It took the promise of Honey Bunches of Oats to finally get her inside.
The moral of the story is that I need to continuously check her collar, and everyone else should, too. Never knew it'd get so loose on its own!