do you mean as opposed to grass. Not sure how much dogs are trained to use grass. I mean I do bring them there so maybe they pick up on that and true if for some reason they seem to be starting before the grass I will pull them over but honestly I think they prefer the grass or other earthen areas over concrete. Basically not sure if that behavior is trained so much as instinct but I suppose it could be a bit of both. much training is about reinforcing behavior dogs do to begin with so I guess you could say that about all of it. sorry sorta ruminating this through my head as I type.