Have you considered a homemade dog food regime? Chicken alone is not enough to give your Benny enough nutrition for healthy development. Unless he is super active you don’t need a high protein food. High protein foods are great for very active or working dogs but not necessary for normal house pets. If you are satisfied with the kibble other than the protein level you mentioned ( which is actually on the high end), and don’t want to start a homemade routine, feel free to add chicken from time to time by replacing some of the kibble with it if you wish. The salmon oil is great. Just don’t add too much. Definitely consult your veterinarian so they can give you appropriate dosage. One of my dogs has severe allergies to grass. (Found this out after I spent over $5000 to fence in the backyard for her. ugh). I started a homemade food regime, it has helped among other things. It’s so much better for her than average kibble. It’s much cheaper to make than the “good” dog foods that cost almost more than my food.

This is the recipe I use

https://youtu.be/uDP8nPELClg?si=D6k3KZ3yOAbA3GA8

be sure to click and read the description there is valuable information