>I live in Barcelona and not even Gaudi’s architecture can distract you from the amount of dog feces and piss that are rampant in this city

That's become extremely common in American cities too, in the past 2 years or so.

Here in Tokyo, I never see dog feces on the ground. Dogs are always on a leash, and their owners always clean up after them. I guess it's a cultural difference: dog owners outside Japan (and maybe Germany) think they're entitled to let their dogs run wild and crap wherever they want.