[matese]

Welcome to YT, so glad you have decided to become a member. Socializing a dog must start at a very young age, obviously this was not done with Marleau. Seems like Marleau wants to love and bond with your 13 yo if he lays next to him. Marleau is still in the trust and bond stage with your 13 yo. Have you son enter the room where Marleau is in slowly, maybe your son walking at "his" normal pace is to fast and scares Marleau, reason for the attack mode. Have your son offer Marleau treats when he enters the room, Marleau will associate your son with good things. Have your son not make sudden movements around Marleau as this seems to scare him. I believe something happened when he was with prev. owners. A 9 month old puppy should not be that skiddish around ppl, kids yes if Marleau is not use to teenages. Growling at ppl on his walks. I would have a friend, neighbor or a relative come for visits, someone that Marleau is not familiar with. Give them a treat to offer Marleau. Let them enter your home but ignore Marleau, have them sit, still ignoring the dog. Eventually Marleau will come over to sniff the stranger, have this person then slowly offer Marleau the treat. This should be done with a variety of strangers so Marleau gets use to all types of ppl, their voices, their action their scent. Marleau freezes and growls out of fear, he is still a puppy and can be reprogrammed to trust ppl. This will fall on you to train this out of him. For now I would not bring him to any pet stores, to many strangers would be to overwhelming to him as he is now. I believe a dog behaviorist would be the best solution if you do not want to try working this out on your own. Lets see what other members suggest / advise.