Have you tried these ventilated nest box pads or something similar that you would recommend? 
http://www.firststatevetsupply.com/store/product_info.php?cPath=27_81&products_id=258
	
		
			
		
		
	
				
			http://www.firststatevetsupply.com/store/product_info.php?cPath=27_81&products_id=258
	