When the person being charged at — someone who, by the way, has PTSD from prior dog trauma and is caring for a person with a dog saliva allergy — asks the owner to leash her animal, the response is essentially: *I can do whatever I want and nobody cares.*

Signs posted throughout the park say otherwise. Dogs must be leashed. It's not ambiguous. It's not a suggestion. But rules only work when someone enforces them, and in San Francisco, enforcement of low-level quality-of-life rules has become something of a punchline.