(1) All vicious dogs shall be confined in a locked enclosure. It shall be unlawful for any owner or keeper to maintain a vicious dog upon any premises which does not have a locked enclosure.

(2) It shall be unlawful for any owner or keeper to allow any vicious dog to be outside of the dwelling of the owner or keeper or outside of the enclosure, unless the vicious dog shall be securely muzzled and restrained with a chain having a minimum tensile strength of 300 pounds and not exceeding three feet in length, and shall be under the direct control of a person capable of completely restraining the dog and under the direct supervision of the owner or keeper of the vicious dog.