The material below is Open Game Content from a 3PP Source
This immense black wolf is the size of a horse, its fangs as large and sharp as knives.
Dire Wolf CR 3 (XP 800)
N Large animal
Init +2; Senses low-light vision, scent; Perception +10
AC 14, touch 11, flat-footed 12 (+2 Dex, +3 natural, –1 size)
hp 37 (5d8+15)
Fort +7, Ref +6, Will +2
Speed 50 ft.
Melee bite +7 (1d8+6 plus trip)
Space 10 ft.; Reach 5 ft.
Str 19, Dex 15, Con 17, Int 2, Wis 12, Cha 10
Base Atk +3; CMB +8; CMD 20 (24 vs. trip)
Feats Run, Skill Focus (Perception), Weapon Focus (bite)
Skills Perception +10, Stealth +3, Survival +1 (+5 scent tracking); Racial Modifiers +4 Survival when tracking by scent
Environment cold or temperate forests
Organization solitary, pair, or pack (3–8)
An enormous version of a normal wolf, dire wolves represent the wolf in its most primal form. These creatures follow the same basic behaviors of regular wolves, but are much more aggressive. Dire wolves often serve giants as hunting companions and vicious guard animals. Some ferocious humanoids and woodsmen use trained dire wolves as mounts. Darker than normal wolves, dire wolves' coats tend toward blacks and deep mottled grays. An adult dire wolf is typically about 9 feet long and weighs roughly 800 pounds.