In tents and disused warehouses, artists sketched dog caricatures, vendors displayed patterned pajamas and hats for pets, and groomers pampered Pomeranians and chow chows with brushes and lotions.

Beth Gogolewski said a viewer from India sent a picture that she’d sketched of Corrine and her dog. Corrine’s fraternal twin Carly said another viewer from Argentina sent a text message cheeri ...