If an animal control officer or a law enforcement officer has investigated and determined that there exists probable cause to believe that a dog is potentially dangerous, vicious or a nuisance, the animal control officer, or his or her designee, shall petition the Animal Control Director, or his or her appointee, for a hearing for the purpose of determining whether or not the dog in question should be declared potentially dangerous, vicious, or a nuisance. Whenever possible, any complaint received from a member of the public which serves as the evidentiary basis for the animal control officer or law enforcement officer to find probable cause shall be sworn to and verified by the complainant and shall be attached to the petition. The chief officer of the animal control department or head of the local law enforcement agency shall notify the owner or keeper of the dog that a hearing will be held by the hearing entity, at which time he or she may present evidence as to why the dog should not be declared potentially dangerous, vicious, or a nuisance. Said evidence may be offered either written or oral by the owner of the dog or any interested citizen, including animal control officers, humane officers or peace officers, and shall be sworn to and/or signed under declaration of penalty of perjury. (Ord. 1937, § 1, 7/30/1991)