White dog poo is down to the amount of bone in the dogs diet - 30 years ago lots of dogs ate bones regularly - white dog poo - then people stopped giving dogs bones, no white dog poo, then people started feeding multicoloured grain filled sugar filled cheap crap to dogs (wagg, bakers, frolic, asda hero etc)... and that gives you ORANGE dog poo that is resistant to rain, wind, snow, ice, nuclear bombs, etc...
I have five dogs, they eat a raw diet and eat raw bones and produce.. white dog poo - it goes white after about 4 hours and turns to dust after about 12. I never leave poo on public footpaths, pavements etc (I do sometimes leave it deep in the undergrowth and nettles in places its not feasible to pick up from, or stick and flick as per some woodland walk guidance).
I would hang draw and quarter people who leave shit in the street, the same as those who spit, leave nappies, leave broken glass, vomit, or any other heinous thing I havent yet thought of.
I use a wheelchair so take the horror of poo on pushchair wheels and times that by a million trillion - thats someone elses poo (dog, child, adult, fox, whatever, I dont care) or SPIT... on my HANDS.. my FUCKING HANDS...
I am very ragey when I see people leaving any offensive material on the pavement. Very ragey indeed!