Dinosaur, Dimetrodon

The massive sail on the back of this squat reptilian creature flexes and twitches as the beast stalks forward.

Dimetrodon CR 3

XP 800
N Large animal
Init +6; Senses low-light vision, scent; Perception +6

AC 14, touch 11, flat-footed 12 (+2 Dex, +3 natural, -1 size)
hp 34 (4d8+16)
Fort +8, Ref +6, Will +2

Speed 30 ft.
Melee bite +8 (1d8+7/19-20)
Space 10 ft.; Reach 5 ft.
Special Attacks tearing bite

Str 20, Dex 15, Con 18, Int 1, Wis 12, Cha 3
Base Atk +3; CMB +9; CMD 21 (25 vs. trip)
Feats Improved Initiative, Weapon Focus (bite)
Skills Perception +6, Stealth +3

Tearing Bite (Ex)

A dimetrodon’s jaws are filled with razor-sharp teeth of two different sizes. This gives the creature a threat range of 19-20 with its bite attack.

Source Wikipedia

Environment warm forests
Organization solitary, pair, or pack (3-12)
Treasure none

A dimetrodon is a quadrupedal reptile similar in shape to a crocodile, but with a blunter snout filled with jagged, sharp teeth. Its most distinguishing feature is the massive sail that runs the length of its back. By extending or contracting the fin, the cold-blooded reptile can control its body temperature with ease. While they are not technically dinosaurs, dimetrodons are still often found dwelling in regions inhabited by such creatures.

A fully grown adult dimetrodon can reach a length of up to 15 feet and weigh upward of 2,000 pounds.

Section 15: Copyright Notice Pathfinder Roleplaying Game Bestiary 3, © 2011, Paizo Publishing, LLC; Authors Jesse Benner, Jason Bulmahn, Adam Daigle, James Jacobs, Michael Kenway, Rob McCreary, Patrick Renie, Chris Sims, F. Wesley Schneider, James L. Sutter, and Russ Taylor, based on material by Jonathan Tweet, Monte Cook, and Skip Williams.