The material below is Open Game Content from a 3PP Source
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.
Dire Rat CR 1/3
N Small animal
Init +3; Senses low-light vision, scent; Perception +4
AC 14, touch 14, flat-footed 11 (+3 Dex, +1 size)
hp 5 (1d8+1)
Fort +3, Ref +5, Will +1
Speed 40 ft., climb 20 ft., swim 20 ft.
Melee bite +1 (1d4 plus disease)
Special Attacks disease
Str 10, Dex 17, Con 13, Int 2, Wis 13, Cha 4
Base Atk +0; CMB –1; CMD 12 (16 vs. trip)
Feats Skill Focus (Perception)
Skills Climb +11, Perception +4, Stealth +11, Swim +11; Racial Modifiers uses Dex to modify Climb and Swim
Environment any urban
Organization solitary or pack (2–20)
Disease (Ex) Filth fever: Bite—injury; save Fort DC 11; onset 1d3 days; frequency 1/day; effect 1d3 Dex damage and 1d3 Con damage; cure 2 consecutive saves. The save DC is Constitution-based.
Dire rats grow up to 2 feet long and weigh up to 25 pounds. They are common menaces in dungeons and city sewers alike.
Dire Rat Companions
Starting Statistics: Size Small; Speed 40 ft., climb 20 ft., swim 20 ft.; Attack bite (1d4); Ability Scores Str 10, Dex 17, Con 12, Int 2, Wis 12, Cha 4; Special Qualities low-light vision, scent.
4th-Level Advancement: Attack bite (1d4 plus disease); Ability Scores Str +2, Con +2.