zack started lifting his leg around 6 months and marking, outside. i got him neutered at 7 months. the leg lifting continued in the backyard but not out front on walks. in the backyard, he does it more than half the time but still squats too. On walks for months,, he never peed at all, or maybe once, and didn't mark at all. Then, after some months he has started marking out on walks pretty regularly. not sure why there was this pattern. neutering seemed to help stop and even reverse the progression of marking, and of being overly excited about other dogs, to the point of borderline hysteria. He calmed a bit, but did not lose energy, did not become more likely to sleep, on the contrary, he became more wakefull, at home, he would explore and play almost constantly, and if he laid down, he'd lay for long periods with eyes open, looking at me or other things.