I recently bought an ExPen for my 2 puppies for when I am not home. There is a tarp-like sheet underneath the pen to prevent any soiling of the carpet. The first day, Maggie (3mos) got out...I assuming the tarp bunched up (by the dogs) and lifted the pen and she was small enough to crawl out. Does anyone have any ideas how to keep the pen from lifting up so that the dogs can't escape? Thanks.
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