Diesel was rescued on his kill date, a 70# emaciated, five year old English Mastiff with no training. Today, four months later, Diesel is a 152 pounds magnificent work in progress. An affectionate, loving very active,large Mastiff. He has free roam of my large fenced acreage. Diesel comes when called, lays, shakes hands, no longer jumps on people. Is good with our resident mastiff and miniature horses. Small dogs not yet. I am super impressed with his intelligence and eagerness to learn. Diesel is heartworm positive and is undergoing treatment.