The last few weeks have seen a number of tech sites reporting on a robot which can find and point out Waldo in those “Where’s Waldo” books. Designed and built by Redpepper, an ad agency.

Forget the books—this time Waldo was found wondering the streets of Stafford County. And he had a lot of curious onlookers. Monday around 7:30 a.m., Waldo, the miniature horse, was spotted near ...