I I can understand ordinances against domestic livestock like chickens and such. Barnyards can have some pretty special smells and noises.
My chickens make far less noise than the majority if dogs in our area. Plus they don't go around crapping and peeing on everyone's mailboxes.
By the way, webster's definition of livestock includes any animal keep for profit or pleasure. That oils include dogs or cats.
Look, I said I understand not agree with.
If anything, I advocate less regulations and more reason. I didn't mean to ruffle any feathers :-D. I've had chickens before and realize that a well maintained coop without a rooster doesn't smell and isn't loud. On the other hand, one poorly socialized and trained Labrador retriever or German Sheppard can make enough noise to drive a neighborhood insane.
It takes reason, responsibility and the ability to understand basic concepts to make any society work. Some how these traits have been lost. Because of this we are living in a world where the honeybee is regulated by a council of ignorance to a piece of property next to a sewage plant. I could go on but I really get tired of stating the obvious.