Anyone have feedback or knowledge on mastiffs or more precisely, mastiff/ shepherd mixes? My wife and I decided to start looking for another dog after losing our shepherd mix last summer. We found a puppy at the local humane society that she fell in love with. He is part of a litter that they have, but they are not exactly sure of the breeds. They think they are shepherd mastiff mixes, which is probably right. This pup looks a bit more shepherd while his litter mates look more mastiff. I don't know much about the mastiff breed other than they are big. Anyone have experience with these? How easily do they train? What is their energy level like? How well do they get along withother dogs? What problems are inherent to the breed? Thanks.