I have a mastiff pit mix but he is only seventy pounds...i dont want to over or under feed him and every site?

says something different about how much to feed either a mastiff or a pit...so im lost...i only feed him dry food and then usually something lowfat and some treats...i split up two scoops in morn and two scoops at night....just not sure if thats enough for such a big dog...he always seems hungry