Snip and Clip
Long nails do nothing for your dog's traction on ice (think stilettos) and it's essential to keep them nice and neat for snowy time. After that, trim the hair between the paw pads — when trying to step safely on ice, his toes splay for maximum surface area . . . and excess snow can pack up in between and attach to that loose fur, too.
Source: Flickr User raybdbomb