Plastic storage tub from a hardware store (about 35 gallons / 132 L)[1] X Trustworthy Source The Humane Society of the United States National organization devoted to the promotion of animal welfare Go to source (Easiest option) Old doghouse from a friend or neighbor Plywood or lumber (one 4 x 8 ft sheet, or assorted scrap)

These dog house instructions will work for cats as well, with the modifications described below. Use these if you’re building the house from lumber or plywood.

If you’re using a plastic storage tub, use the lid as a roof. Once complete, you can weigh down the roof using rocks or other heavy objects.

Keep the shelter on a covered, raised patio. Stack the shelter on stacks of scrap lumber, concrete blocks, or other objects. The stack must be completely flat and sturdy. Surround it with heavy objects if necessary to prevent collapse. Keep it on a sturdy plywood sheet raised off the ground by four 2x4s (38 x 89mm) legs attached with coated deck screws.

If the house is not raised, start cutting the doorway about 2" (5 cm) above the ground to prevent flooding from rain. If the house is raised, cut the entrance on a side with a ledge in front of it (from the plywood or stacked objects) so the cat can jump up to it. Cut the exit somewhere with no ledge beneath it, so predators can’t easily access it. For added warmth, staple or glue canvas drop cloth over the interior of each doorway.

For serious protection and further insulation, cover the roof with roofing material.

In areas with severe winter, consider using Mylar instead, which will reflect the cat’s body heat. [6] X Trustworthy Source The Humane Society of the United States National organization devoted to the promotion of animal welfare Go to source You may line the floor with Mylar as well. Cut the foam with a utility knife.

Do not use hay, which absorbs moisture and can cause allergies. [8] X Research source Do not use blankets, towels, or loose newspaper. These can absorb body heat and chill the cat. [9] X Trustworthy Source The Humane Society of the United States National organization devoted to the promotion of animal welfare Go to source Some cats will eat packing peanuts, which can cause intestinal blockage. [10] X Research source Double-bag them with pillowcases to minimize this risk.

In temperatures below freezing, use an electrically heated water dish. If you can’t afford one, use a ceramic or thick plastic dish and surround it with styrofoam.

Cats may chew the cardboard or Styrofoam, so don’t use anything you want to reuse.

Cut a couple of small windows or viewing strips if you want to watch the cat while it plays inside. Glue rags or spare fabric over the doors and windows so you can give your cat some alone time.

Use packing tape, duct tape, or another sturdy tape.

If you have a multistory cat house put an extra-fun toy on the highest level, so the cat has fun working out how to reach it.