 Grace Newton, WTOP News. A dog being boarded at an Alexandria PetSmart is dead. His owner wants to know why. Clark, a three-year-old Aussie doodle, was dropped off at the Potomac Yard PetSmart June 27th by his owner, Andrew Knowles. He says two days later, a local veterinarian called to tell him a female PetSmart employee had dropped off Clark dead at his office. Knowles tells NBC4 the vet noticed a few things.