Costco Kirkland Signature Dog Food earns the Advisor’s second-highest rating of 4 stars.
The Kirkland Signature product line includes the 6 dry dog foods listed below.
Each recipe includes its related AAFCO nutrient profile when available on the product’s official webpage: Growth, Maintenance, All Life Stages, Supplemental or Unspecified.
- Costco Kirkland Signature Puppy (4.5 stars) [U]
- Costco Kirkland Signature Small Dog (4.5 stars) [U]
- Costco Kirkland Signature Mature Dog (4.5 stars) [U]
- Costco Kirkland Signature Healthy Weight (3 stars) [U]
- Costco Kirkland Signature Adult Lamb, Rice and Vegetable [U]
- Costco Kirkland Signature Adult Chicken, Rice and Vegetable [U]
Costco Kirkland Signature Adult Chicken, Rice and Vegetable recipe was selected to represent the other products in the line for this review.
Costco Kirkland Signature Adult Chicken, Rice and Vegetable
Dry Dog Food
Estimated Dry Matter Nutrient Content
Ingredients: Chicken, chicken meal, whole grain brown rice, cracked pearled barley, chicken fat (preserved with mixed tocopherols), egg product, dried beet pulp, potatoes, fish meal, flaxseed, natural flavor, brewers dried yeast, millet, potassium chloride, salt, choline chloride, carrots, peas, dried kelp, apples, cranberries, rosemary extract, parsley flake, dried chicory root, glucosamine hydrochloride, dried Lactobacillus acidophilus fermentation product, dried Bifidobacterium animalis fermentation product, dried Lactobacillus reuteri fermentation product, vitamin E supplement, iron proteinate, zinc proteinate, copper proteinate, ferrous sulfate, zinc sulfate, copper sulfate, potassium iodide, thiamine mononitrate, manganese proteinate, manganous oxide, chondroitin sulfate, ascorbic acid, vitamin A supplement, biotin, niacin, calcium pantothenate, manganese sulfate, sodium selenite, pyridoxine hydrochloride (vitamin B6), vitamin B12 supplement, riboflavin, vitamin D supplement, folic acid
Fiber (estimated dry matter content) = 4.4%
Red denotes controversial item
|Estimated Nutrient Content|
|Dry Matter Basis||29%||18%||45%|
|Calorie Weighted Basis||25%||37%||39%|
The first ingredient in this recipe is chicken. Although it is a quality item, raw chicken contains up to 73% water. After cooking, most of that moisture is lost, reducing the meat content to just a fraction of its original weight.
After processing, this item would probably account for a smaller part of the total content of the finished product.
The second ingredient is chicken meal. Chicken meal is considered a meat concentrate and contains nearly 300% more protein than fresh chicken.
The third item is brown rice, a complex carbohydrate that (once cooked) can be fairly easy to digest. However, aside from its natural energy content, rice is of only modest nutritional value to a dog.
The next ingredient is barley. Barley is a starchy carbohydrate supplying fiber and other healthy nutrients. However, aside from its energy content, this cereal grain is of only modest nutritional value to a dog.
The fifth ingredient is chicken fat. This item is obtained from rendering chicken, a process similar to making soup in which the fat itself is skimmed from the surface of the liquid.
Chicken fat is high in linoleic acid, an omega-6 fatty acid essential for life. Although it doesn’t sound very appetizing, chicken fat is actually a quality ingredient.
The sixth ingredient is egg product, an unspecified (wet or dry?) form of shell-free eggs. Quality can vary significantly. Lower grade egg product can even come from commercial hatcheries — from eggs that failed to hatch.
In any case, eggs are easy to digest and have an exceptionally high biological value.
The seventh ingredient is beet pulp, which is a controversial ingredient, a high fiber by-product of sugar beet processing.
Some denounce beet pulp as an inexpensive filler while others cite its outstanding intestinal health and blood sugar benefits.
We only call your attention here to the controversy and believe the inclusion of beet pulp in reasonable amounts in most dog foods is entirely acceptable.
The next ingredient is potato. Potatoes can be considered a gluten-free source of digestible carbohydrates. Yet with the exception of perhaps their caloric content, potatoes are of only modest nutritional value to a dog.
The ninth ingredient is fish meal, another protein-rich meat concentrate.
Fish meal is typically obtained from the “clean, dried, ground tissue of undecomposed whole fish and fish cuttings” of commercial fish operations.1
Unfortunately, this particular item is anonymous. Because various fish contain different types of fats, we would have preferred to have known the source species.
From here, the list goes on to include a number of other items.
But to be realistic, ingredients located this far down the list (other than nutritional supplements) are not likely to affect the overall rating of this product.
With 5 notable exceptions…
First, flaxseed is one of the best plant sources of healthy omega-3 fatty acids. Provided they’ve first been ground into a meal, flax seeds are also rich in soluble fiber.
However, flaxseed contains about 19% protein, a factor that must be considered when judging the actual meat content of this dog food.
Next, brewers yeast can be a controversial item. Although it’s a by-product of the beer making process, this ingredient is rich in minerals and other healthy nutrients.
Fans believe yeast repels fleas and supports the immune system.
Critics argue yeast ingredients can be linked to allergies. This may be true, but (like all allergies) only if your particular dog is allergic to the yeast itself.
In addition, a vocal minority insists that yeast can increase the risk of developing the life-threatening condition known as bloat. However, this is a claim we’ve not been able to scientifically verify.
In any case, unless your dog is specifically allergic to it, yeast can still be considered a nutritious additive.
What’s more noteworthy here is that brewers yeast contains about 48% protein, a factor that must be considered when judging the actual meat content of this dog food.
In addition, we find peas, which are a quality source of carbohydrates. And like all legumes, they’re rich in natural fiber.
However, peas contain about 25% protein, a factor that must be considered when judging the meat content of this dog food.
Next, chicory root is rich in inulin, a starch-like compound made up of repeating units of carbohydrates and found in certain roots and tubers.
Not only is inulin a natural source of soluble dietary fiber, it’s also a prebiotic used to promote the growth of healthy bacteria in a dog’s digestive tract.
And lastly, this food contains chelated minerals, minerals that have been chemically attached to protein. This makes them easier to absorb. Chelated minerals are usually found in better dog foods.
Costco Kirkland Signature Dog Food Review
According to its ingredients alone, Kirkland Signature Dog Food looks like an above-average dry product.
As a group, the brand features an average protein content of 28% and a mean fat level of 15%. Together, these figures suggest a carbohydrate content of 49% for the overall product line.
And a fat-to-protein ratio of about 54%.
Which means this Kirkland Signature product line contains…
Near-average protein. Near-average fat. And near-average carbs when compared to other kibbles.
Even when you consider the protein-boosting effect of the flaxseed, peas and brewers yeast, this looks like the profile of a dry dog food containing a moderate amount of meat.
Costco Kirkland Signature is a grain-inclusive dry dog food using a moderate amount of named meat meals as its main source of animal protein, thus earning the brand 4 stars.
Kirkland Dog Food
The following list (if present) includes all dog food recalls since 2009 directly related to this Kirkland product line. If there are no recalls listed in this section, we have not yet reported any events.
- Kirkland Dog Food Recall (5/5/2012)
A Final Word
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Important FDA Alert
The FDA is investigating a potential link between diet and heart disease in dogs. Click here for details.
Notes and Updates
- Association of American Feed Control Officials ↩
11/22/2019 Last Update