'No dog pee' signs are everywhere. Can they be enforced?

(NEXSTAR) – Dog owners know the signs well. They usually feature a cartoon illustration of a dog in a circle, crossed out. The accompanying text can be direct ("no dog pee") or passive aggressive ("be respectful").

In any case, the message to dog walkers is clear: Do not let your dog do its business here. And that can leave dog owners – especially those without their own private plots of grass to let their dogs pee all over – in a tough spot. One Redditor said despite attempts to keep their dog peeing on the public sidewalk...