I have had chickens for several years in Mississauga and had no problems with neighbors. I told everyone around me about them, made sure that their pens were clean, used manure for my garden and had great fun with them when in the garden. I had only 4 hens at any one time. To me they are social animals, love a pattern, have individual personalities and offer as much interaction as domestic pets.
Most urbanites who like birds will keep them in good conditions. I had a light for them during the winter to keep them housed warm and gauged cold by state of water in the morning. Never needed more than one bulb.
For me, keeping chickens is a health issue. I like to support humane animal treatment and avoid hormone additives that are given to factory farmed hens.
We should be changing bylaws to admit keeping of animals in city spaces. With climate change, water shortages, the days of pesticide laden lawns manicured by weed and feed and homogenized by instant landscapes we ought to be reverting to more sustainable methods of landscaping. My chickens had plenty of bugs to pick and were great workers in their run.
I've had to send them to a friendly out of town location until this law is changed.