I think I've figured it out. I examed paws yesterday and Maggie's paws
have more webbing between the toes, so it's almost like snoeshoes when
she walks around. Smokey has toes almost like humans, very little webbing,
so snow must get between his toes more.

Smokey didn't get any frostbite yesterday. He didn't stay out that long,
When it's this cold I usually stay by the door & limit their time outside
anyway.