City officials in Frankfurt are fed up with pooches fouling all over the place.
Tell on owners
So they've suggested the idea of large number plates which would go round the dogs' necks.
Then members of the public could let officials know which dogs had done their business where they shouldn't.
Peter Postleb, head of the Clean Frankfurt campaign, said:
"If they (owners) know their dog can get them rumbled, they might just think twice about it".