Lola was climbing over her baby gate about a week after she came home! We fixed this by putting a screen (we had an extra one that had fallen out of one our windows the week before and never got around to putting back) in front of the baby gate so she cannot climb it. It fits perfectly in the doorway, she can still see thru the screen and the baby gate keeps the screen secure. In the three weeks since we started this tactic she hasn't figured out a way around it yet!
