Clocking in at just under 50 minutes at the opening matinée, the Circa '21 Dinner Playhouse's (under) 21 Youth Theatre's adaptation of Go, Dog. Go! is a great opportunity for preschool and early school-aged kids to experience their first local-theatre production. (In retrospect, I could've even taken my 20-month-old daughter, along with a Snack Trap and three refills of Cheerios.) The show features a series of simple vignettes plucked from the pages of P.D. Eastman's 1961 children's-book classic about the friendship between six adorable canines. And while the general lack of dialogue or a steady plotline may bore some adults, the rudimentary yet whimsical scenes and characters will likely appeal to the under-10 crowd.