does anyone know what are the rules for dogs at the park are?

I often find a sign that says dogs are not allowed. Yet i find plenty of people in the park with their dogs. they let their dogs off leash at night. even the police and gardeners dont care if their are dogs in the park. they actually put doggy-poop bags inside the park. its like you have to leave your dog outside the park, run in get the bag.

does anyone know of the rules if your caught in the park with your dog. will you get a ticket-if so how much?

Has anyone ever seen a real dogs only park in switzerland?