I'm feeding Reesie Puppy Wellness. He likes it pretty well. He is eating between half cup and 3/4th cup every day. I looked on the bag and it said that for his weight and age he should be eating 1 and 1/2 cups a day!!! I free feed so he is getting as much as he likes, but is just not interested in eating any more than he is. He doesn't get too many treats either. A few Cherrio's here and there and that's it. He is 15 weeks and is about 4 lbs. Do you think that he is eating enough?