He has never marked our house. Opps, I lie, once he did when we first brought him home. He was 22 months old and lived with 3 other dogs. My Dh caught him lifting his leg and asked him " WHAT THE H....L DO YOU THINK YOU ARE DOING?" and that was the end of that. He has been very good since. The woman I got him from said to watch out because he marked his territory but I think that was because of the other dogs and that he was not neutered. He is now.