The question arose as to the cleanliness of streets in 1908. As I noted, a half-ton animal can make a fairly large mess. Interestingly enough, The Times complained that the newer paved avenues were more of a problem than the old dirt streets.
You see, with dirt streets, the horse manure disintegrated and was mixed into the dirt, The Times said. However, with paved streets, the horse manure stubbornly remained horse manure–but in smaller and smaller bits.
The problems were so dire that The Times launched one of its innumerable beautification projects in 1908, listing the eyesores of the day.