To leash, or not to leash? That, more than any other question, is sure to spark an uproar in public parks. No matter where the battle plays out, the fault line falls in the same place, with dog owners and walkers who wish to let their pups run free on one side and, on the other, park-goers with children who wish to visit open spaces free of dog bites and smelly surprises smashed to the soles of their shoes.