Electric Radiant Slab Heated Cat House

We recently rescued a cold stray cat that was hanging around our home at Edisto Island. I wont go into the ugly details of that story but it reminded me of one of my most clever and successful inventions, the electric radiant-slab-heated cat house. This should be shared with all humankind for the benefit of our animal friends, or at least the ones we keep as pets but don't let into the house. The illustration above shows how you can build this home for your animal companion. You can of course modify this with your own ideas to fit the size of your pet. Here's what I did:

Start with a cheap plastic round garbage can of about 35 gallon capacity.
Cut the bottom off straight and square.
Cut out a circle from rigid foam insulation like you use for foundation insulation.
Sit the bottomless top half of the garbage can on it.
Cut out a circle of hardware wire and place it on the surface of the foam insulation to act as concrete reinforcing.
Stick a bunch of little galvanized finishing nails at diagonals through the hardware wire into the foam to help ensure that it is held on after the concrete is poured.
Stick a bunch of roofing nails laterally into the sides of the can an inch from the bottom to help ensure that the concrete slab attaches securely to the plastic of the can sides.
Weave in an electric bedding plant heater cable such as a six foot Gro-Quik Soil Warming Cable with integral 74 degree thermostat. Tie it to the hardware wire so it doesn't pucker up above the concrete that you are about to pour.
Mix up a bag of Redi-mix concrete, pour it in the can to about 1.5 inches deep, and let it set up for a day.
Cut a barely cat-sized hole in the side of the garbage can a couple of inches above the slab surface.

Plug it in and keep it plugged in. It is low wattage and even begins to cycle off and on after the slab warms and the thermostat starts regulating to 74 degrees. I added a thin towel for the cat to have something soft to snuggle onto but you shouldn't add a big wad that insulates the cat from the heat below.