Pre-industrial city streets hosted open refuse and roaming scavenger animals.

Evidence

And then you note for the first time the large numbers of animals in the streets-pigs eating the garbage, insects attracted to the excrement, dogs tearing at bones. There are larger animals too, horses and oxen drawing carts through the crowded, narrow streets, and other animals being driven to the marketplace. — Lyn H. Lofland, World of Strangers_ Order and Action in…, 167