Unfortunately, I would guess that once the newness of the chicken wings wears off, he will start turning them down too. I doubt they'll solve the problem. They are, at least at this point, getting some nutritious food in him though.
I decided to TRY and test things out by feeding him ONE raw chicken wing. He gobbled it up! I fed him another one after that..and same thing, he gobbled it up as if he had his appetite back. I'm so confused. So he won't eat his kibble that he has been gobbling up since he was a puppy, not even with his favorite baby food..but he will eat chicken wings if I feed it to him. What does this mean?
another update: I withheld food from him since him still turning down food yesterday after the vet visit. It has been 24 hours now. I put down food this morning and just put down food again for him for dinner and he turned down both meals..again..even after not eating for 24 hours. This is so unlike him. I'm worried sick. Ok..so I know this isn't always the greatest idea but I have read a lot about people feeding raw diets to their dogs recently. I don't plan on feeding him a raw diet but I bought raw chicken wings from the grocery store earlier today for myself but after seeing him turn down two meals in a row since yesterday, I decided to TRY and test things out by feeding him ONE raw chicken wing. He gobbled it up! I fed him another one after that..and same thing, he gobbled it up as if he had his appetite back. I'm so confused. So he won't eat his kibble that he has been gobbling up since he was a puppy, not even with his favorite baby food..but he will eat chicken wings if I feed it to him. What does this mean?
He has been eating Puppy Purina Pro Plan the Lamb and Rice formula since he was weaned off his mom's milk. He never had any issues with it and it is what his breeder feeds all of her dogs and they all seem very healthy. She is reputable and I have only read good things about her.

I agree with this. We bought a bag from a different pet store than the usual one we buy from and it had moth larva in it. Yes little worms crawling around. I noticed web like things in the canister and I was like WTF and then I noticed them. So gross. I returned it right away. Got a store credit and never bought bagged food from there again. The manager explained that sometimes this can happen in transit.It could just be that specific bag of food. Inspect it up and down and maybe consider trying a different small bag to see if he eats it without any toppers. Bad batches can happen in any step of the food process from manufacturer to shipment to sitting on the shelf.