I heard the icy stuff can hurt the pads on thier paws.
Also, parents of teenagers, find an empty lot covered with snow and ice and have them learn what sliding feels like and how to control the car. One of the best things my Dad ever did for me...
Heck, if you don't know how to drive in this stuff, try it when the roads are clear, but there is still ice on a school or church lot.
A word of wisdom to people trying to drive up hills----the more you use the gas, the more you'll spin your tires. It will NOT help you go up hills at all.