Whenever it becomes necessary to safeguard the public from the dangers of hydrophobia, the Mayor, if he shall deem it necessary, shall issue a proclamation ordering every person owning or keeping a dog to confine it securely on the premises, unless the dog shall have a muzzle of sufficient strength to prevent it from biting any person. Any unmuzzled dog running at large during the time of the proclamation shall be seized and impounded, and, if suspected of being infected with rabies and displaying vicious propensities, may be killed by the Dog Warden without notice to the owner. Dogs impounded during the first two days of the proclamation shall, if claimed within five days, be released to the owner, unless infected with rabies, upon payment of the impounding charges heretofore provided in Section 505.20. If unclaimed for that period, the dog may be summarily destroyed. (1979 Code 91.11)