City law said it is illegal for any two animals to have sex in public within Dibble city limits.Link
It's also against law for them to relieve themselves in public even if the animal is fenced in on private land.
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. Come and hear Mark speak at the ALA conference in Chicago on July 1.