Hello all, We just rescued a 1 1/2 year old Mastiff, Max, that my husband and I are both crazy about. We live on several acres. We have two other smaller mixed breed dogs. They stay in a fenced back yard during the day but often my husband or I take them out into the unfenced portion of the yard. We've noticed that if Max can't see us he will often wander off to a neighbors yard. In fact, we found him after he had wandered away from his original owners yard. (They decided to give him to us.) Our other dogs don't seem to do this. Just wondering if this is a trait of Mastiffs or just our Max.