But you can make good with a local farmer and you could be set. I'm getting a Bullmastiff in late Jan 05'. Since the breeder has always feed her dogs this way and they are so beautiful I figured why not. After my research I was pretty impressed. Your 155 pound Mastiff sounds very nice. He is still growing right. At the begining of my dog search I was looking at the Mastiff but if found them a little big for me. But I loved the look so much I looked into the Bullmastiff and fell in love.