I cut my doors differently than yours, I cut a 7 or 8 inch wide door about 13 inches tall, the edges of the vertical cut goes all the way to the edge or radius of the barrel, this leaves a trap for a good deep layer of bedding in the bottom- then cut a lick tub in half vertically and lap the open end about 6 or 7 inches over the doorway in the barrel and screw it down, this makes a good porch that keeps water from blowing in on them and would help keep snow from blowing in as well. I cut some 2" X 2" pieces of the doorway I cut out for washers or reinforcement and put one over the lapped part of the lick tub and one inside the barrel at every screw point "usually about 5 screws" then grind the protruding screw off so as not to stick a dog. Have not buried them but that would be a great insulation and stabilizer.
Can you post a picture?
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