Herd Animal, Aurochs
This large, horned bull has a dirty black hide and an aggressive temper. Its horns are wide and sharp.

AUROCHS (CR 2; XP 600)
N Large animal
Init +0; Senses low-light vision, scent; Perception +9
AC 13, touch 9, flat-footed 13
(+4 natural, –1 size)
hp 22 (3d8+9)
Fort +6, Ref +3, Will +1
Speed 40 ft.
Melee gore +7 (1d8+9)
Space 10 ft.; Reach 5 ft.
Special Attacks stampede, trample (2d6+9, R-DC 17)
Str 23, Dex 10, Con 17, Int 2, Wis 11, Cha 4
Base Atk +2; CMB +9; CMD 19 (23 vs. trip)
Feats Endurance, Skill Focus (Perception)
Skills Perception +9
Environment plains
Organization solitary, pair, or herd (3–30)
Treasure none
Special Abilities
Stampede (Ex) A stampede occurs if three or more creatures with stampede make a trample attack while remaining adjacent to each other. While stampeding, the creatures can trample foes of their size or smaller, and the trample's save DC increases by +2.

Aurochs (both singular and plural) are large herd animals similar to domesticated cattle.

Aurochs Companions
Starting Statistics: Size Medium; Speed 40 ft.; AC +1 natural armor, Attack gore (1d6); Ability Scores Str 14, Dex 12, Con 12, Int 2, Wis 11, Cha 4; Special Qualities low-light vision, scent.

7th-Level Advancement: Size Large; AC +3 natural armor; Attack gore (1d8); Ability Scores Str +8, Dex –2, Con +4; Special Qualities stampede, trample.