Lizard, Spitting Crawler (CR 1/3)

Tiny Animal
Alignment: Always neutral
Initiative: +2 (Dex)

AC: 14 (+2 size, +2 Dex), touch 14, flat-footed 12
Hit Dice: 1/2d8 (2 hp)
Fort +2, Ref +4, Will +1
Speed: 20 ft., climb 20 ft.
Space: 2 1/2 ft./0 ft.
Base Attack +0; Grapple -12
Attack: Bite +4 melee
Full Attack: Bite +4 melee
Damage: Bite 1d4-4
Special Attacks/Actions: Spit acid
Abilities: Str 3, Dex 15, Con 10, Int 2, Wis 12, Cha 2
Special Qualities: Uses Dex for Climb checks
Feats: Weapon Finesse (bite)
Skills: Balance +6, Climb +10, Escape Artist +4, and Hide +12
Advancement: -
Climate/Terrain: Any underground
Organization: Solitary
Treasure/Possessions: None

Source: Forgotten Realms Campaign Setting

This 2-foot-long lizard is commonly chosen as a familiar by drow and other wizards of the Underdark. The spitting crawler can spit a stream of acid three times per day. If the creature makes a successful ranged touch attack upon a single target within 20 feet, its acid does 1d4 points of damage per round for 2 rounds.