I had a similar incident once with Bella where she got excited and literally twisted & turned like a wild little banshee (sp?) and next thing I saw was she literally was able to get one shoulder inverted just a bit and when I tugged...poof, she was out of it in a split second.
That is the reason I will only use the vest type harness that velcro's shut and then has a plastic snap-clasp on top of that with two D-Rings. She's locked up tighter than Fort Knox!
She is my only bad
houdini-baby who must wear a straight jacket before exiting our home and since that one time, there has not been a repeat performance!