No person shall keep, shelter or harbor any dangerous animal as a pet, or act as a temporary custodian for such animal, or keep, shelter or harbor such animals for any other purpose or in any other capacity within the City except in the following circumstances:
1. The keeping of dangerous animals for exhibition to the public by a bona fide traveling circus, carnival, exhibit or show.
2. The keeping of dangerous animals in a bona fide, licensed veterinary hospital for treatment.
3. Any dangerous animals under the jurisdiction of and in the possession of the Iowa Department of Natural Resources, pursuant to Chapters 481A and 481B of the Code of Iowa.