I have a Mastiff puppy who is eating prey model raw for about a month. He is almost 16 weeks old and weighs 44 lbs. He looks great but I was just wondering if I am supposed to be feeding him a percentage of his adult weight, how do I figure this with such a big swing in adult weights I see for the Mastiffs? His mother was 160 lbs and his father was 190. Right now he is eating 2 or sometimes 3 chicken quaqrters a day (morning, noon and evening) and some gizzards and hearts occasionally. His stool looks great and I can see his last 2 ribs. Just looking for some reassurance.