How To Build A Doghouse For Two Dogs. Cut 1” and ½ “ foam insulation board to fit inside walls, the 1” and ½ “ foam should be flush with the 2×2’s on the interior. Tons of diagrams and instructions are all included in this free doghouse plan.
Install 2″ high density polystyrene. Frame up a 2×2 wall and cover with 1/2″ plywood, also install a 1×2″ guard rail. Using old scraps was challenging on some levels due to warped boards.