(I'm pleased to tell you that the team completed all the character reference sheets and sent them to Sheila. She'll be making high-quality Giclee prints for Kickstarter backers. The early onset of fire season in Colorado due to the Western drought has slowed progress, since one of our artists is also a firefighter there. The recent Heartbleed Internet scare also cost us another two weeks of lost time, but we are back on track now.)
Once we designed the Named and UnNamed cats, we turned to their threehorn "deer" and dappleback horses. I had based my original dappleback conception on paintings of Eohippus, however Eo was far too ancent (Eocene), and far too tiny. Not only that, but Eo is no longer considered a horse, having been recently re-classified as a paleothere.
When I wrote Ratha's Courage, I based the dappleback horse on the pony-sized Parahippus of the Miocene, which fit better with the Named cats, who are a bit larger than cheetahs.
Artist Lew L