At one time I tried Wellness Core original as part of a kibble rotation for my senior Bentley and my now 2 yr. old lab. I fed 2 1/2 cups total daily to Bentley. He did fine on it, but his coat wasn't as nice as it is on some other kibbles. My lab seemed itchy on it. So, I dropped it out of our rotation since I like to feed both dogs the same thing.
I feed Tinkerbell Wellness Core Reduced fat, when she first went on it she was over 80 pounds, we started her on 2 1/2 cups a day divided between 2 meals with some veggies and then dropped her down to 2 cups a day divided between 2 meals with veggies. A year later she was down to her current 66 pounds. She still eats just the 2 cups with veggies and is satisfied with that. She is not very active so if she was more active she would probably need a little more.
We are extremely satisified, it is the first food she has been willing to eat without coaxing and therefore we have been on it about 18 months now (longer than any other food)
And the first thing people remark on with Tinkerbell is how soft and nice her coat is. But every dog is different