Why is there no longer white dog pooh on the streets?

There's no such thing as "white dog pooh" - dog poop is typically brown. It's possible you're thinking of something else, or maybe there's a misunderstanding.

Could you please clarify what you mean by "white dog pooh"?

Perhaps you're referring to:

* Bird droppings: These can be white, especially from pigeons.

* Other animal waste: Some animals, like rabbits or certain birds, may produce white or off-white droppings.

* A specific breed: While all dog poop is brown, there might be a breed you're thinking of with a unique dietary habit that results in a different color.

If you can give me more context, I can help you understand what you're referring to.