To square a bear hide, have the bear lying flat on its stomach and measure the tip of the nose to the tip of the tail. Write that number down. Then measure from the tip of the longest claw on left front paw, across the back to the tip of the opposing longest claw on the right paw.
Add the first measurement, nose to tail, to the second measurement, paw to paw. Then divide by 2. That should give you the “square” of your bear.