Terrestrisuchus

This little reptile resembles a reptilian greyhound, though it’s smaller than a housecat. Its tail is twice as long as its body.  

Originally Posted by InsanePsychoRabbit of the Wizards Community forums.

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Terrestrisuchus is a distant cousin of crocodiles, but it is clearly built for speed. It uses this speed to chase down lizards and insects, its prey.  A terrestrisuchus is 20 inches long from nose to tail and weighs no more than a couple of pounds.  

Terrestrisuchus
Tiny animal
Hit Dice	½ d8 (2 hp)
Initiative	+2
Speed	30 ft. (6 squares)
Armor Class	14 (+2 size, +2 Dexterity), touch 14, flat-footed 12
Base Attack/Grapple	+0/-12
Attack	Bite +4 melee (1d3-4)
Full Attack	Bite +4 melee (1d3-4)
Space/Reach	2½ ft./0 ft.
Special Attacks	—
Special Qualities	Dash, Low-Light Vision, Scent
Saves	Fort +2, Ref +4, Will +1
Abilities	Strength 3, Dexterity 15, Constitution 10, Intelligence 2, Wisdom 12, Charisma 7
Skills	Hide +10, Jump +10 (+14 with a running start), Listen +3, Spot +3
Feats	Run, Weapon Finesse (B)
Environment	Temperate plains
Organization	Solitary
Challenge Rating	1/6
Advancement	1 HD (Tiny)

Combat

Terrestrisuchus do not attack anything larger than Tiny size. They run away from any larger, threatening creatures at top speed.

Dash (Ex): Once per minute, a terrestrisuchus can move up to 5 times its base land speed (150 feet) when it makes a charge.

Skills: Terrestrisuchus has a +8 racial bonus on Jump checks and uses its Dexterity modifier instead of its Strength modifier for Jump checks.

Terrestrisuchus as Familiars

Terrestrisuchus grants its master the benefits of the Run feat.