Ill start, white dog sh@t
Yes !!
I was talking about this with a customer last week...you never see any white dog sh'ts anymore...not like in the 80's or earlier.
My girlfriend reckons they were Poodle sh@t but after researching the subject it seems its to do with dogs diets and calcium.
Apparantly dogs used to eat a lot of bone/bones in their food and when deposited on the pavement for a few weeks the rain would wash out the organic stuff and leave a kind of fossil behind of the bone matter. This coupled with the fact that dog sh@t is now more or less always picked up or a heavy fine that its just not left out in the street as long as it used to be.