I've noticed as my boy is getting older he is more interested in marking on walks. When we are in public or pavement he will not mark but if he passes by a tree or bush he becomes interested. All of the males i've ever owned were neutered early, this is my first that will be left intact. Up until now i've let him stop and sniff and mark when he wants to, because walks are his time and i'm not in a hurry. I walk him to exercise his body and brain and it seems like smelling and marking is part of that? He has never tried to mark indoors, or pet smart or any of those places but he does seem to be getting obsessive outdoors for example we went to his nose class last night and before class started the dogs in the class were outside playing together. He completely ignored the other dogs trying to play with him and just went off on his own to mark the entire time. A border collie was stalking him and play bowing like crazy but he wanted nothing to do with the dog. Which I am fine with, if he doesn't want to be social that is okay. Not like he was being aggressive or anything. I'm worried about this translating into indoors since he is so obsessed, I used to work for the SPCA and a vet so I was always told neuter young so they don't mark indoors! How much of that is even true? Is this even something I should be concerned about lol? To let him mark on walks or not?