Costco Kirkland Dog Food Review — Is It Actually Good, Who Makes It, and What Vets Really Think

These cover the highest-volume search questions about Kirkland dog food — answered without marketing language or brand spin.

• 1
  Who makes Kirkland dog food for Costco? Diamond Pet Foods, Inc. — U.S. manufacturer operating since 1970 · 5 facilities across AR, CA, MO, SC, OK · Also makes Taste of the Wild under same protocols

  Kirkland is Costco's private-label brand — meaning Costco owns the recipe specifications, nutritional targets, and quality standards, while Diamond Pet Foods owns and operates the factories where every bag is actually made. Diamond was founded by two brothers-in-law in Meta, Missouri and has grown into one of the largest pet food manufacturers in the U.S., producing food for numerous other recognizable brands from the same facilities. The key takeaway for buyers: this is not a cheap, anonymous contract operation. Diamond is a known entity with a documented track record, real manufacturing infrastructure, and significant reputational skin in the game. Their other flagship brand, Taste of the Wild, earns consistently strong reviews at a significantly higher retail price — yet the underlying manufacturing is identical. That gap in price represents Costco's warehouse model eliminating distributor markup, not any compromise in production quality.
• 2
  Is Kirkland dog food good quality — do vets recommend it? Yes — Dog Food Advisor rates the grain-inclusive line 5 stars · AAFCO-approved for all life stages · Most vets consider it a solid budget option · Caveat: grain-free Nature's Domain versions receive more caution from vets due to DCM concerns

  The grain-inclusive Kirkland Super Premium line — the Chicken, Rice & Vegetable and Lamb, Rice & Vegetable formulas — earns consistently positive assessments from veterinary professionals. It meets AAFCO Dog Food Nutrient Profiles for the stated life stage, lists real meat (chicken, lamb, or salmon) as the first ingredient, includes glucosamine and chondroitin for joint health, contains no corn, wheat, or soy fillers, and incorporates Diamond's proprietary Active9 probiotic blend of five live strains. For the majority of healthy adult dogs, this is a nutritionally complete, digestively tolerable food at a price that allows owners to stay consistent long-term — which matters far more than occasional upgrades to pricier kibble. Where vets exercise more caution is with the Nature's Domain grain-free formulas, which the FDA flagged in its ongoing DCM investigation due to high legume content. One veterinary specialist summarized the consensus well: grain-inclusive Kirkland is 'pretty good' and AAFCO-approved; the grain-free versions deserve more thought before committing.
• 3
  How much does a 40 lb bag of Kirkland dog food cost at Costco? In-store: ~$33–$50 for a 40-lb bag ($0.77–$1.25/lb) · Online (Costco.com): significantly more due to shipping · Chewy price for comparable Diamond Naturals: $46.99 ($1.17/lb) — Kirkland is ~38% cheaper for essentially the same food

  Kirkland's price structure is its most compelling argument. The Adult Chicken, Rice & Vegetable formula in a 40-pound bag runs approximately $33–$36 in-store — roughly $0.77 to $0.90 per pound. The comparable Diamond Naturals formula on Chewy costs $46.99 ($1.17/lb), making the Costco version about 38% cheaper per pound for a recipe made by the same manufacturer in the same facilities. Step up to Blue Buffalo, Hill's Science Diet, or Purina Pro Plan and the gap widens further — those brands typically run $1.50–$3.44 per pound at pet retailers, meaning Kirkland can cost 50–78% less per pound while meeting identical AAFCO nutritional standards. One important caveat: buying Kirkland online through Costco.com costs significantly more than in-store due to shipping fees — sometimes up to 67% more. The value only exists in the warehouse. A Costco membership ($65/year for Gold Star) pays for itself within a few months for owners of large or multiple dogs.
• 4
  Has Kirkland dog food been recalled? Yes — twice: 2007 (melamine contamination) and 2012 (Salmonella) · No recalls since 2012 — over 13 years of clean testing · Diamond significantly upgraded batch testing protocols after 2012 · Always check FDA.gov/animal-veterinary for current recall status

  The honest history is this: Kirkland has been involved in two significant recalls. In 2007, during an industry-wide contamination crisis originating from Chinese wheat gluten suppliers, Kirkland's canned dog food was recalled for melamine. In 2012, a Salmonella outbreak traced to Diamond Pet Foods' Gaston, South Carolina facility swept across multiple brands manufactured there — including Kirkland, Taste of the Wild, Wellness, Natural Balance, and Canidae. The CDC confirmed at least 16 human infections, and Costco faced a class-action lawsuit after a dog death and an infant hospitalization connected to the contaminated food. That 2012 event forced a wholesale overhaul of Diamond's safety infrastructure. Diamond now tests all incoming raw materials before acceptance and tests every single production batch before shipment, retaining samples until the product's expiration date. The practical result: no recalls of Kirkland products since 2012 — more than thirteen years of clean testing across millions of bags. That record is worth noting, though any buyer should bookmark the FDA recall database (fda.gov/animal-veterinary) and check it when purchasing a new batch.
• 5
  What is the Kirkland dog food salmon formula — is it good? Kirkland Nature's Domain Salmon Meal & Sweet Potato: grain-free · Salmon meal + ocean fish meal = strong omega-3 profile · AAFCO approved for all life stages including large breeds · Good for fish-sensitive dogs but contains peas and potatoes — discuss with vet if your dog has cardiac history

  The Kirkland Salmon Meal & Sweet Potato formula — sold under the Nature's Domain grain-free line — is one of the brand's most popular choices among owners of dogs with chicken or beef sensitivities. Salmon meal is the first ingredient, followed by ocean fish meal, providing a concentrated omega-3 fatty acid profile that supports skin health, coat shine, and inflammation management. The formula is AAFCO-certified for all life stages including growth of large-breed dogs, and it includes Diamond's prebiotic and probiotic digestive support system. What buyers need to understand clearly: this formula is grain-free and contains peas and potatoes high in the ingredient list — precisely the profile that the FDA flagged in its ongoing DCM investigation. The FDA has not established that these ingredients definitively cause heart disease, and the investigation remains open without a definitive causal link confirmed. But veterinary cardiologists generally recommend choosing grain-inclusive formulas unless a dog has a documented grain sensitivity confirmed by a vet. If you feed the salmon formula, mention it to your vet at your next visit and ask about monitoring cardiac health.
• 6
  What is Kirkland dog food compared to Diamond Naturals, Blue Buffalo, and Purina Pro Plan? vs Diamond Naturals: nearly identical formula, ~38% cheaper · vs Blue Buffalo: similar first ingredients, Kirkland costs ~60% less · vs Purina Pro Plan: Pro Plan has more veterinary research backing, Kirkland costs ~55% less · For healthy dogs without special needs, Kirkland grain-inclusive holds its own against all three

  The comparison to Diamond Naturals is almost unfair — it is essentially the same food from the same manufacturer with a different label. The first four ingredients in Diamond Naturals Adult Chicken and the Kirkland Chicken, Rice & Vegetable formula are identical. Blue Buffalo Life Protection uses real meat as a first ingredient and avoids by-products, similar to Kirkland, but at $1.40–$1.80 per pound versus Kirkland's $0.80. Purina Pro Plan is the brand most frequently cited in peer-reviewed veterinary nutrition studies and is recommended more often by board-certified veterinary nutritionists than any other commercial kibble — but it runs $1.40–$2.00 per pound. The honest positioning for Kirkland: for healthy adult dogs with no special dietary needs, the grain-inclusive formulas deliver comparable macro nutrition to Blue Buffalo at dramatically lower cost. Pro Plan earns its premium through deeper research investment and a longer track record of veterinary clinical data. The practical question is whether that premium is worth $600–$900/year for a large dog. Many owners — and their vets — conclude it is not.
• 7
  Is the grain-free Kirkland Nature's Domain safe — what is the DCM concern? FDA investigation ongoing — no definitive causal link confirmed · Over 90% of DCM cases involved grain-free diets · 93% of those contained peas and/or lentils · Nature's Domain is included in reported cases · Most vets now recommend grain-inclusive formulas as the default

  In July 2018, the FDA's Center for Veterinary Medicine opened an investigation into reports of dilated cardiomyopathy — a potentially fatal heart disease — in dog breeds not typically prone to it. The common thread: these dogs had been eating grain-free kibbles high in peas, lentils, and potatoes for months to years. By 2019, the FDA had documented 524 cases and noted that over 90% involved grain-free diets, with 93% of those containing peas and/or lentils. Nature's Domain was among the brands named in reported cases. The FDA has paused public updates pending more scientific data and stopped short of confirming a direct causal link. A peer-reviewed study published in a veterinary journal found cardiac markers in healthy Labrador retrievers shifted measurably after 30 days of high-legume grain-free feeding — though the clinical significance remains debated. What this means practically: for dogs without a documented grain sensitivity, the grain-inclusive Kirkland Super Premium formulas are the less controversial choice. For dogs already eating Nature's Domain with no issues, a conversation with your vet — and possibly a cardiac screening if the dog has been on the formula for over a year — is reasonable precaution without being cause for panic.
• 8
  Is there a Kirkland puppy food — and is it good for large-breed puppies? Yes — Kirkland Puppy Formula uses chicken as first ingredient · AAFCO-certified for growth including large-breed puppies · Calcium:phosphorus ratio within safe growth range · Avoid the grain-free puppy formula if cardiac concerns exist

  Kirkland offers a puppy formula with chicken and chicken meal as the primary protein sources, alongside whole-grain brown rice and cracked pearled barley. It is AAFCO-certified for all life stages including growth of large-size dogs over 70 pounds as adults — meaning the calcium and phosphorus levels fall within the controlled range recommended to avoid accelerated bone development in large breeds. The kibble size is small enough for toy breeds but adequate for larger pups. The formula includes omega fatty acids for brain and coat development and the Active9 probiotic system. One constraint: both Kirkland puppy formulas contain chicken, making them unsuitable for puppies with a confirmed chicken sensitivity. If your puppy requires a chicken-free formula, you will need to look elsewhere. For the average healthy puppy going to a family without specific allergen concerns, this formula represents exceptional value — particularly for large-breed owners who may feed a puppy kibble for 12 to 18 months before transitioning to adult food.

All formulas are Costco-exclusive in the warehouse. Prices vary by region; always confirm current pricing in-store.

Use the buttons below to find your nearest Costco warehouse, compare pet food at other retailers, or locate a veterinarian for nutrition questions. Always check in-store pricing — online prices are significantly higher for Kirkland products.