animals prohibited appropriate behavior appropriate behaviour bicycles prohibited black black and white communicating communication denial denied dog informing littering prohibited no animals no bicycles no littering not allowed not permitted permission denied prohibited prohibition prohibitions rules sign warning white animal animals ban dogs no shield signs banned canine clean clean up illegal mandatory no dog no dogs poop prohibit roadsign roadsigns shit walking dog-sign forbidden instructions park pet pets pictogram restriction restrictions away keep keep away lawn leash beware cat embargo inhibition injunction interdict oval proscription red round sphere suppression yellow cattle circle field pasture sheep wild wool bark Africa bumps camel desert road