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The short answer: Tie at B (78/100). Chicken Soup for the Soul wins on protein breadth — four named meats (chicken, turkey, chicken meal, turkey meal) in the top four positions vs Diamond Naturals' two. Diamond Naturals wins on simplicity and price — one of the lowest-priced quality-tier kibbles on shelf. Both were historically manufactured at Diamond Pet Foods facilities and share clean grain selection.

The scores

Chicken Soup for the Soul Classic Adult Dry: B (78/100) — Chicken, Turkey, Chicken Meal, Turkey Meal, Cracked Pearled Barley.

Diamond Naturals Adult Chicken & Rice: B (78/100) — Chicken, Chicken Meal, Whole Grain Brown Rice, Cracked Pearled Barley, Grain Sorghum.

How the ingredients compare

The top-five ingredients reveal the formulation split between these two brands:

Chicken Soup: Chicken, Turkey, Chicken Meal, Turkey Meal, Cracked Pearled Barley

Diamond Naturals: Chicken, Chicken Meal, Whole Grain Brown Rice, Cracked Pearled Barley, Grain Sorghum

Both formulas earn the same v15 score, but the ingredient lineups tell different stories about how they got there — that is where the actual pick decision lives.

Where Chicken Soup pulls ahead

Four named meats in the top four positions: Chicken, turkey, chicken meal, and turkey meal occupy positions 1–4 on the Chicken Soup panel before any grain or legume. Diamond Naturals leads with chicken and chicken meal but then transitions to grain at #3. The amino-acid breadth advantage is meaningful. Shop on Amazon →

Four named probiotic strains: Chicken Soup includes four named bacterial fermentation products (Lactobacillus acidophilus, L. casei, L. plantarum, Enterococcus faecium). Diamond Naturals lists fewer named strains. For dogs with digestive sensitivity, this is a structural advantage.

Whole-food micronutrient breadth: Chicken Soup's panel includes apples, tomatoes, spinach, parsley, dried kelp, carrots, blueberries, and cranberries. Diamond Naturals' fruit/vegetable list is shorter. The wider whole-food inclusion means more naturally occurring micronutrients.

Where Diamond Naturals holds its own

Lower shelf price: Diamond Naturals consistently runs 15–25% below Chicken Soup for the Soul at major retailers. For owners feeding multiple large dogs or budget-constrained owners, the price-per-pound advantage compounds quickly. Shop on Amazon →

Simpler ingredient panel: Diamond Naturals' shorter ingredient list means fewer potential allergens and a cleaner read for owners who prefer minimalist formulations. The legume-heavy stack on Chicken Soup (peas + faba beans + lentils) does not appear on Diamond Naturals at the same depth.

Available at Costco and warehouse channels: Diamond Naturals distributes through Tractor Supply, Costco (via the 4Health-Diamond shared production), and rural farm-and-feed channels — making it widely accessible outside of premium-pet-store retail.

The bottom line

Tie at B (78/100). Chicken Soup for the Soul wins on protein breadth (four named meats vs two), probiotic depth (four named strains), and whole-food micronutrient breadth. Diamond Naturals wins on price (15–25% lower), simpler ingredient list, and rural-channel availability. For owners shopping the quality-value segment who prioritize protein-and-probiotic depth, Chicken Soup is the pick. For owners who prioritize price-per-pound and a minimalist panel, Diamond Naturals delivers genuine B-tier value at the segment's most accessible price point.