law: 87. Letting loose horse, etc., and suffering ferocious dogs to be at large.-
  No person shall in any street or public place-
  (a) negligently let loose any horse or other animal, so as to cause danger, injury, alarm or annoyance; or
  (b) suffer a ferocious dog to be at large without a muzzle; or
  (c) set on or urge a dog or other animal to attack, worry or put in fear any person or horse or other animal.