BlueWolf
It's absolutely true. The MoI men proposed the phrase, "Put Your Dog on Fuller's Earth and Beat the Turd Reich". But this was deemed, "Unsuitable" by the Minister of Information, Alfred Duff-Cooper.
After the War, Duff-Cooper conceded there was no evidence the measure had actually prevented anyone stepping in dog muck, but pronounced it had been, "A wonderful morale booster".