I bought one of these http://www.ebay.co.uk/itm/8-SIDED-M...UK_Pet_Supplies_Dogs&var=&hash=item5894b4e784 for my 4 week old hand reared baby as her box is getting too small and she wants to run around. Unfortunately, the gaps between the bars are way too big and she can walk straight out! Looking for something else to use until she grows a bit, any suggestions?