Haha, I was worried about that too. That's why I'm too nervous to take Yawara just yet - he's a fast little guy and won't hesitate to take off!
She was pretty sneaky too. The first time, she just walked on top of the grass and explored. When I picked her up and moved her because she was too close to the neighbor's yard, that was when she started digging and crawling around under the grass and plants. It was pretty cool to watch.