The scores
Kirkland Signature Nature’s Domain Puppy Chicken & Pea: B (79/100) — Good. Chicken and chicken meal lead, grain-free with legumes, chicken fat preserved with mixed tocopherols, probiotics, salmon oil for DHA. Diamond-manufactured, Costco-exclusive.
Taste of the Wild High Prairie Puppy Grain-Free with Roasted Bison & Venison: B (78/100) — Good. Water buffalo first, lamb meal second, with roasted bison and roasted venison further down for novel-protein variety. Same Diamond probiotic blend.
How the ingredients compare
The top five ingredients:
Kirkland Signature Puppy: Chicken, Chicken Meal, Pea, Garbanzo Bean, Lentil
Taste of the Wild Puppy: Water Buffalo, Lamb Meal, Sweet Potatoes, Egg Product, Garbanzo Beans
The scoring story is the protein density in the top two slots. Kirkland commits positions one and two to chicken in two forms — whole and meal — then hits legumes. TOTW leads with water buffalo (whole, water-in, so by dry weight less protein than the meal form), then lamb meal at position two, then a sweet potato carbohydrate. By dry weight, Kirkland carries more animal protein in the first two positions. That’s the one-point difference.
TOTW’s differentiator sits in the middle of the list: roasted bison, roasted venison, and beef arrive at positions ten, eleven, and twelve. These novel proteins are rarely seen in mainstream puppy foods and add amino-acid variety that Kirkland doesn’t match. For owners who specifically want their puppy eating a non-chicken, non-beef protein source for rotational feeding or sensitivities, TOTW Puppy offers something Kirkland doesn’t.
Both formulas carry the Diamond probiotic blend (Lactobacillus plantarum, Bacillus subtilis, Lactobacillus acidophilus, Enterococcus faecium, Bifidobacterium animalis fermentation products). Both use chelated mineral proteinates for better bioavailability than standard sulfates alone. Both avoid grains, both avoid artificial colors, both use mixed tocopherols for preservation. The Diamond-manufacturing DNA shows through on both.
Where Kirkland Signature Puppy pulls ahead
Chicken plus chicken meal in positions one and two. Two animal-protein ingredients in the top two slots is a premium puppy-food architecture. Kirkland hitting it at the Costco price point is the real value story here. Whole chicken brings water-in muscle meat, chicken meal brings dry-weight protein concentration — they complement each other.
Roughly half the per-pound price. Kirkland Signature Puppy runs about $1.25 per pound at Costco on a 20-lb bag. TOTW High Prairie Puppy runs about $2.30 per pound at Chewy on a 14-lb bag. For owners with a Costco membership and a puppy-sized appetite, Kirkland saves meaningful money over a puppyhood of bag after bag.
Chicken & pea primary formula works for more dogs. Chicken is the most common non-allergen protein for puppies. TOTW’s water-buffalo-lamb-bison-venison mix is novel but unnecessary for puppies without known protein sensitivities. Kirkland’s straightforward chicken-first profile matches the typical first-puppy owner’s needs. Shop on Amazon →
Where Taste of the Wild Puppy holds its own
Novel-protein variety. Four distinct proteins — water buffalo, lamb meal, roasted bison, roasted venison — plus beef and fish meal at positions twelve and fifteen. That’s the broadest amino-acid profile in the mainstream puppy food market. For puppies with chicken sensitivities or owners committed to rotational feeding philosophies, TOTW is a purposeful choice.
Retail ubiquity. TOTW Puppy is available at PetSmart, Petco, Chewy, Amazon, and most independent pet stores. Kirkland requires a Costco membership and is not sold online through Amazon or most standard retailers. For owners who don’t want to commit to a Costco membership, TOTW is the accessible alternative.
Brand equity as a grain-free pioneer. TOTW was one of the first mainstream brands to commit to grain-free across an entire lineup. Two decades of formulation refinement show in the ingredient list. The brand is a known quantity for owners who research before they buy; Kirkland’s Nature’s Domain line is newer and less recognized outside Costco. Shop on Amazon →
The bottom line
If you have a Costco membership and want the best puppy-food-per-dollar on the market, Kirkland Signature Nature’s Domain Puppy wins — B/79 at roughly $1.25 per pound is hard to beat. If you don’t shop Costco, or you want the novel-protein mix of bison and venison for rotational feeding, Taste of the Wild High Prairie Puppy is the right pick at B/78. Both are Diamond-manufactured, so the underlying production infrastructure is identical — the choice is price and protein preference. See our best puppy food guide for A-tier alternatives.