@msolga,
Miss Mollie's winter pelt of fur is very sdequate
protection for her bottom side, as you can see here
in this shot taken last month.
She determines for herself if it's okay to stay outside as to how
her paws can withstand the conditions. Nowadays she needs only a
minute or less and will dash back inside to thaw her feet and paws
with her tongue. She'll have it no other way, believe me.