Hi fellow Pittsburgher!!!
If you do decide to switch any time in the future, try checking out Agway. These stores are all over Pittsburgh. They sell a lot of premium dog food there too. Our breeder used to feed her pups Wellness but noticed her pack was getting itchy from it so she switched to Nutrisource Grain Free Seafood Select and we just started getting our babies switched to that too. They don't sell it in a lot of stores around here but Agway was able to supply us with what we need. Not saying that this is the brand for you, but just offering a suggestion for the future.
Also, I was just looking online at this food, and is soft and chewy? Maybe he likes it because of its texture and hard/crunchy kibble just might not be for him. My mom was feeding her late dog beneful which was refigerated and soft/chewy food but because of her allergies, my mom had to switch her food to something harder and crunchy and it took forever for her to come around to eating it - my mom ended up having to put cottage cheese on it for her to even consider it. Just something to think about if you have to switch later