It's not as bad as in other places but there should be less trash and dog shit around. About dogs, owners started to pick up their poo and dispose of it years ago so it's not as bad as it used to be. However everything is relative. I was in Japan, maybe Tokyo, with a friend of mine from Switzerland (regarded by Italians as a very clean place) and he looked around and told me with a sad face "It looks cleaner than home."