No person shall keep or permit to be kept any dangerous animal as a pet or for display or for exhibition purposes, whether gratuitously or for a fee. This prohibition does not apply to the keeping of dangerous animals in a public zoo, public aquarium, bona fide educational or medical institution, humane society, or museum where they are kept as live specimens for public view or for the purpose of instruction, research, or study; or for exhibition to the public by a bona fide traveling circus, carnival, exhibit, or show, or in a bona fide, licensed veterinary hospital for treatment. It shall be the duty of any person, permitted by this section to keep dangerous animals to report immediately to the Police Department when any dangerous animal is found missing.