York, Nebraska
York handles the issue of "dangerous animals" with an ordinance that's open to quite a bit of interpretation:
"It shall be unlawful for any person to permit any bear, wolf or other noxious or dangerous animals to run at large, or to lead any such animal with a chain or rope or other appliances, whether such animal be muzzled or unmuzzled, in any street, avenue, lane, highway, or public place, within limits of city." [6]
References:
[7] lincoln.ne.gov Lincoln Municipal Code: Title 6, Animals