From Pathfinder Society Quest #16: The Winter Queen's Dollhouse, which isn't enabled.

Giant-er Mouse

CREATURE 2

MEDIUM ANIMAL

Perception +8

Skills Acrobatics +7, Athletics +5, Stealth +8

Str +0, Dex +4, Con +3, Int -4, Wis +0, Cha +3

AC 17; Fort +5, Ref +11, Will +5

HP 28

Skittish

Trigger The giant-er mouse is hit with a melee attack

Effect The giant-er mouse takes a step after the effects of the triggering attack are resolved.

Speed 25 feet

Melee Bite +9 (finesse), Damage 1d8+4 piercing plus Grab

Grab

Requirements The monster's last action was a successful Strike that lists Grab in its damage entry, or the monster has a creature Grabbed or Restrained

Effect If used after a Strike, the monster attempts to Grapple the creature using the body part it attacked with. This attempt neither applies nor counts toward the creature's multiple attack penalty.

The monster can instead use Grab and choose one creature it's grabbing or restraining with an appendage that has Grab to automatically extend that condition to the end of the monster's next turn.

Pathfinder Society Quest #16: The Winter Queen's DollhouseOGL