Sounds like you have made some positive decisions.
Nothing compares to a Yorkie furbaby in your arms. As for Lexie escaping from an ex-pen, I've read on some threads ideas on how to put different types of covers over the top to keep those little escape artists from escaping. From the amount of posts it sounds like a lot of YT members have escape artists.
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Rosie(R.I.P. 1996-July 29, 2013)
Cocoa(R.I.P 1998-April 26, 2012):