From The Rolling Stones by Robert A. Heinlein,
flat cats are 8" in diameter and, well, flat.
The book doesn't specify how the three eyes are arranged;
I decided that in a line looked better than a triangle.
The dark fur on the tuxedo is dark red with black tips;
the lower picture (right) shows its belly.
I sold them both at the 2016 Worldcon art show.
Below: a third flat cat, a calico.