My English Mastiff that we saved is 1 year old and weighs 116 pounds, is that good. He's gained 20 in like 2 months. I am feeding him 10 cups a day but I'm not sure if that's enough or too much. What is the norm?

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As long as you can feel his last 2-3 ribs under his skind he is fine. If you see more ribs while he is just walking around, he is underweight. If you do not see 2-3 ribs when he moves he is overweight. My English mastiff is almost 1 yrs. old and weighs 150 lbs. he is in perfect condition and I feed him 8 cups of food a day split morn and night (CANIDAE ALS). If you feed him a quality food than you will not have to feed him as much (more vitamins ans supplements).

5 1/2 - 6 1/4 cups 100 -120 pounds(good dog food (nutro)