When playing tag, or another game where there is a 'base' or other type of safe zone, the person 'it' stands outside the zone, waiting for the person to leave so as to tag them.
person1: *runs into base*
person2: *stands outside base waiting for them to try to escape*
person1: Hey! No puppy-dog gaurding!
person2: *stands outside base waiting for them to try to escape*
person1: Hey! No puppy-dog gaurding!
by LouDogintheVan August 25, 2009