[BRACKET "1"] BUILD FRAMES Begin your doghouse by cutting the pieces out of two 4-by-8-foot sheets of ½-inch CDX plywood sheathing. More expensive plywood can be used, of course, but CDX is adequate if you keep the house painted. Cut and assemble two 24-by-42-inch frames from treated two-by-fours, safe here because the dog can't chew them. Drive in two 10d nails at each corner to hold the frames together. Fasten the plywood floor and porch pieces onto their respective frames with 6d nails spaced 6 inches apart.