I agree, it is probably the sugar in the Beneful that he likes. If you can, get him off of it ASAP. I would also go with the Wellness Core Puppy and see how he likes it. If he likes it softer, you can always top it with some canned, or add lukewarm water, let it sit for a few minutes, then mush it up and serve.
Remember that rotation is always good, so you can try other puppy foods or all-life-stages foods from the link on the right on the homepage, Best Dry Foods (it has sub-links I believe, called “5-star dry puppy foods” and “4-Star Dry Puppy Foods”) and browse around. Some better kibbles that have been tried by forumers are Earthborn Holistic Grain Free (but the puppy grain-inclusive one is good too), Dr. Tim’s, Victor, Vets Choice Holistic Health Extension, and then the slightly more questionable Blue Buffalo Wilderness, TOTW, Canidae Pure.
Good luck!
