Thanks, everyone.
Tim, I couldn't remember if I tried it during that shoot, so I checked the archives. Sure enough...
This was at about 1/25th of a second, so not quite as slow. There are a couple reasons it doesn't work as well, mainly the busy background and the medium tones. Those don't provide enough contrast for the falling snow pattern to be as effective (compared to a dark bison silhouette). And of course, though we had big flakes the snow fall wasn't nearly as heavily as during my bison shoot.
I was extremely happy with the non-blurred shots from that puma shoot, and I keep hoping the family portrait I got from it will hit the mark in one of these big contests (I did just have it displayed at an exhibition in China). The challenge there, if you recall, was to shoot a lot of photos, because it was too easy for the big snowflakes to obscure important details in the pumas' faces.
Max