Regarding the retractable Avant dog partition grille that was discussed back in June/July, how does it hold up versus a persistent and agile 60 pounder who really wants to get up front? Looks to me from the pictures that were posted (see http://www.pinkpank.net/a4org/9806x4/messages/233.shtml thanks!) that my guy would get around the edges in around 5 seconds.<p>Also, do you lose the split folddown seat ability?<p>Thanks<br>