A recent dog attack on New York’s Upper West Side may have been preventable, according to the owner of the victim, a 10-year-old Chihuahua mix named Penny. Penny was mauled by two large dogs earlier this month, and her owner, Lauren Claus, blames the city for failing to enforce a prior Department of Health order that required the aggressive dogs to be muzzled and leashed. That order followed a fatal attack involving the same dogs in Central Park in January. Despite two summonses issued in March,