Add another row of walls on top of your main whelping box to make a cage. This bundle comes with "double-height" connecting posts that allow the stacking. The bottom front panel with door is replaced by the Stacks new full height front panel set for easy entry/exit. This is not a complete box and must be used with a Fab System Whelping Box of the same size. 

Fab Stack 4x4 includes: 

• Fab Stack Front Panel Set (full height door entry)
• 3 x 4' side panels
• 6 x stack connectors
• 4 x corner braces
• 6 x tall 42" posts
• Hardware packet

Fab Stack 4x6 includes: 

• Fab Stack Front Panel Set (full height door entry)
• 1 x 4' side panel
• 4 x 3' side panels
• 10 x stack connectors
• 4 x corrner braces
• 8 x tall 42" posts
• Hardware packet

Optionally, purchase the mesh cover to provide additional security.