FREQUENCY: Rare ([Cold Wilderness Hills], [Cold Wilderness Forest], [Cold Wilderness Swamp], [Cold Wilderness Plains], [Cold Wilderness Desert])
FREQUENCY: Very rare ([Cold Wilderness Mountains])
NO. APPEARING: 1-6
ARMOR CLASS: 6
MOVE: 15"
HIT DICE: 2
% IN LAIR: 20%
TREASURE TYPE: [SB]
NO. OF ATTACKS: 1
DAMAGE/ATTACK: 1-6
SPECIAL ATTACKS: Breath weapon
SPECIAL DEFENSES: Nil
MAGIC RESISTANCE: Standard
INTELLIGENCE: Animal
ALIGNMENT: Neutral
SIZE: S (4' long)
LEVEL/X.P. VALUE: II | 28 + 2

Inhabitants of cold regions, hoar foxes are usu. encountered in small packs and are rarely (10% chance) aggressive unless threatened.
However, their pelts, of beautiful silver-grey fur, are regarded as very valuable -- an undamaged specimen will command 100 gold pieces on the open market --
and for this reason they are often threatened by adventurers. <update DMG fur table>

Though they bite in attack for 1-6 HP of damage, their main weapon is a breath weapon -- a cone of cold with a range of 30',
only wide enough to catch one victim.
The cold does 2-12 HP of damage (a save will halve the damage).
For the purpose of the breath attack,
the victim's AC is treated as 10 (though modifiers for dexterity are permitted).

The hoar fox is immune to cold-based attacks but takes double damage from fire (and fire will, of course, render the pelt valueless).
 

by Graeme Morris