my gsd puppy who is 5 months pees in the backyard and wherever he has peed the grass is taller so my backyard looks really weird because randoms patches are higher. i didnt think it was because of him because i thought their pee killed the grass. My lawn people says its because of the dog. How can i stop some parts from growing higher ?

i try to train him to pee by our blueberry farm but hes lazy to go there