up here in Southern Ontario the by-laws are odd.
all pets any pets are not allowed because it is based on a complaint basis.
for example: lets say i have a dog, 2 cats, and 3 snakes. I don't own a dog but I do own the latter but for this example if my dog bites someone and they complain about him to the authorities . if the authorities come into my house and notice i own 3 snakes a dog and 2 cats they may only take my dog . if i walk one of my snakes down the street and there is a complaint because that person is scared of snakes the authorities may only take the snake in question, none other .
so theoretically no one may own a pet up here, but it is allowed weird eh?