A long time ago, the only dog poo left lying around was white. The reason for this was that the darker dried dog poo was removed by unscrupulous pub landlords. Pubs would often have bowls of snuff on the bar for the convenience of customers and these meanies would bulk out the snuff with dried, dark dog poo.
Hence the story of the two gentlemen enjoying a convivial pint when one observed, "There's a hell of a smell of dog poo in here!" His friend responded, "I can't smell it but I do have a blocked nose!" The other replied, "Blocked nose? Have a pinch of that snuff" Nothing better for clearing a blocked nose!" His friend took a large pinch then said, "By God that stuff works fast! I can really smell that dog poo now!"

Actually they both said dogshit but this is mudcat!

Eddie