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Riding Rat

Source Monster Codex pg. 177
Companion Type Animal
Monster Entry Link
This filthy rat is the size of a small dog. It has a coat of coarse fur, a long and scabby tail, and two glittering eyes.
Starting Statistics: Size Medium; Speed 40 ft., climb 20 ft., swim 20 ft.; AC +1 natural armor; Attack bite (1d6); Ability Scores Str 14, Dex 15, Con 17, Int 2, Wis 13, Cha 4; Special Qualities low-light vision, scent.

4th-Level Advancement: AC +2 natural armor; Ability Scores Str +2, Dex +2; Bonus Feat(s) Endurance.