As your question, and the concern it gives rise to, suggests, the fundamental problem is that keeping animals of any kind within urban and other built up areas is incompatible with serious hygiene requirements. Those who accept the lack of hygiene will remain unconcerned while those who don't will be unhappy. Those who are sufficiently unhappy and have the option will move to somewhere that has better hygiene. The point is that opinions/attitudes differ and it can cause friction. I was on a bus once where a small group of people brought on board two dogs, one of which proceeded to urinate on the floor. The people concerned apparently found this incident amusing because they laughed. From then until I left the bus, passengers entering and leaving had to "wade" through urine. I asked the bus company what their policy was and they said animals are allowed on board but not on the seats - there is no plan to change this policy. I have no hesitation in stating that I would like animals banned from buses and would be happy to see them, and other animals than fish, banned from all built up areas. There are examples of such rules in other countries and I am quite certain neither animals nor humans suffer as a result - unlike the creatures locked up on the nth floor of some apartment block and the people who have been blinded by toxocara canis, or other suffered other health problems contracted via animals. Meanwhile dogs and cats in particular remain a politically sensitive subject which the authorities are wary of tackling, in spite of dogs maiming and killing people every year. I understand that fines are an option but that, at least here in our area, they are rarely levied and probably even more rarely, if ever, collected.