The shelves at this 12-year-old pet-supply shop are full of natural and holistic foods ($10–$25) that would please any veterinarian, such as Nature’s Recipe, which targets concerns like allergies and intestinal health. But the comestibles aren’t the only treasures: Rifle through the chests of Barking Zoo’s own wool and cotton knit sweaters ($35–$75) for sophisticated argyle, stripe and Fair Isle prints that will make your hound look Harvard-bound.