I remember that stuff too. Looked like chalk! Maybe we don't see much of it these days as people bagged it up and bin it. Well they are supposed to anyway!
All comes down to better nutrition for dogs courtesy of Pal Iams Chum etc.
In days gone by people used to feed the dogs food scaps from their table plus a couple of bones from the butcher. White poo can be caused by undigested bone residue.
When we were kids everyone said white pooh was poodle pooh. l believed it for years even though there was tons of it and we didnt know anyone who had a poodle
As a couple of the answers have already suggested, when did you last see a dog chewing a bone? They used to be a standard element of any dog's diet, helping to sharpen its teeth and provide it with plenty of calcium. In the absence of that natural calcium, the whiteness in the f�ces simply disappeared.
White poo is the calcium left behind as the water evaporates, and the organic components of the crap are consumed leaving the inorganic stuff behind.
Dogs don't eat as much bone as they used to. Tighter regulation on dogs pooing on pavements means that poo doesnt hang around for long in public places like it used to, giving it less opportunity to dry out and turn white
I agree that it is from the bones and apart from the fact you don't see dogs running around freely like you did when I was a kid - which is good, hopefully the lack of it is also caused by more people cleaning up after their dogs. I think it's more the former than the latter though. It's such a shame that a lot of dogs don't get marrowbones any more because it's not only nutritious for them, but it also occupies their minds for hours on end. Also the leftovers from the dinner table: if the dog will eat them, isn't it much better than binning them - and much better for the dog than canned mush or biscuit meal?
Hahaha one of our dogs recently pood white poo! It's been so long since I saw such a thing! I had added cooked liver into her food... hmm, could that have made it go white? She's never pood white before!!!!