Amatuerfoxhunter-
I have killed many fox with full bellies and/full mouths. Once a red came to my call, layed something down, then soon died. Upon inspection it was six voles all stacked like cord-wood, all heads in the same direction, that he set down to approach me.
Fox store food, so running around with mice, squirrels, etc, hanging from their mouth is not uncommon.