Costco’s private label pet food is sold under the Kirkland Signature brand. While Costco itself is not a pet food manufacturer, their dog foods are produced by Diamond Pet Foods, a large North American pet food manufacturer with multiple production facilities across the United States.
Diamond Pet Foods has been manufacturing pet food for over 50 years and produces diets for several different brands in addition to Kirkland Signature. Their facilities follow strict safety and quality standards, and many of their diets are formulated to meet the nutritional guidelines established by the Association of American Feed Control Officials (AAFCO).
One of the major advantages of the Costco model is scale. Because Costco sells extremely high volumes of products, they are able to negotiate lower ingredient and production costs while maintaining relatively high ingredient quality compared to many budget dog foods.
Kirkland Signature dog foods are formulated with the goal of providing complete and balanced nutrition at a reasonable price point. Their recipes typically emphasize:
- Named animal protein sources
- Balanced fat levels
- Moderate carbohydrate inclusion
- Added vitamins and minerals to ensure nutrient adequacy
While these foods are formulated to meet AAFCO nutrient profiles, Costco does not publicly provide detailed nutrient breakdowns beyond the guaranteed analysis. This means we cannot fully evaluate all micronutrients such as individual vitamins, minerals, or fatty acids without independent lab analysis.
Still, from a formulation perspective, Kirkland Signature foods are generally designed to be nutritionally balanced and appropriate for everyday feeding.
Costco keeps things simple with a focused lineup rather than overwhelming variety. Here is what each formula is designed to do, and who it suits best.
The most widely available formula and a solid everyday choice for adult dogs. Chicken and chicken meal are the primary proteins, supported by whole grain brown rice and cracked pearled barley for digestible carbohydrates. Also includes probiotics, glucosamine, and chondroitin, which is a nice touch at this price point.
Best for: Healthy adult dogs with no dietary restrictions.
A grain-free option using salmon and salmon meal as the primary proteins, with sweet potatoes and peas as carbohydrate sources. Includes salmon oil as a direct DHA source, taurine, and blueberries and raspberries as antioxidant inclusions. Worth noting: the DCM and grain-free debate is still ongoing — speak to your vet before switching to grain-free long term.
Best for: Dogs with grain sensitivities, or owners seeking a novel carbohydrate source.
Formulated to support growth and development, with higher protein and fat levels than the adult formulas. Large breed puppies in particular need careful calcium-to-phosphorus ratios during growth, so check that this formula is appropriate for your puppy’s expected adult size.
Best for: Puppies in their growth phase. Confirm AAFCO growth life stage compliance on the bag.
Uses lamb and lamb meal as the primary proteins — a useful option for dogs who have been on chicken-based diets and may benefit from a protein rotation, or for dogs with chicken sensitivities. Slightly lower protein (23%) and fat (14%) compared to the chicken formula. Also contains taurine and glucosamine.
Best for: Dogs needing a novel protein or those on a protein rotation schedule.
Adjusted nutrient profiles to suit smaller body sizes or older dogs. Senior formulas typically feature moderately lower fat and calorie density to support healthy weight maintenance. Small breed dogs have higher metabolic rates and often benefit from smaller kibble sizes and higher energy density.
Best for: Dogs under 10 kg, or dogs aged 7+ years.
One of the biggest advantages of Costco dog food is simplicity. Instead of dozens of product variations, Costco focuses on a smaller number of well formulated recipes.
This can actually be beneficial for many pet owners. Excessive product lines can make it confusing to select the right diet. Kirkland Signature simplifies the decision by focusing on a handful of formulas that meet the needs of most dogs.
Their product selection includes: Puppy formulas, Adult maintenance diets, Small breed options, Senior formulas, and Grain free recipes.
Most formulas are available in large bags ranging from 30 to 40 pounds, making them particularly cost effective for households with large dogs or multiple pets.
Select a formula below to view its ingredient list and guaranteed analysis. These numbers are as-fed, not dry matter — keep that in mind when comparing across brands.
- 26% protein is low-moderate and suitable for most adult dogs
- Includes probiotics and added glucosamine/chondroitin
- Chicken fat is a quality fat source, well-preserved with tocopherols
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, dried yeast, millet, potassium chloride, salt, choline chloride, carrots, peas, dried kelp, apples, cranberries, rosemary extract, parsley flakes, dried chicory root, glucosamine hydrochloride, dried Lactobacillus plantarum fermentation product, dried Bacillus subtilis fermentation product, dried Lactobacillus acidophilus fermentation product, dried Enterococcus faecium fermentation product, dried Bifidobacterium animalis fermentation product, vitamin E supplement, iron proteinate, zinc proteinate, copper proteinate, ferrous sulfate, zinc sulfate, manganese sulfate, copper sulfate, potassium iodide, thiamine mononitrate, manganese proteinate, chondroitin sulfate, ascorbic acid, vitamin A supplement, biotin, niacin, calcium pantothenate, sodium selenite, pyridoxine hydrochloride, vitamin B12 supplement, riboflavin, vitamin D supplement, folic acid.
- Salmon oil provides a direct DHA source, good for omega-3 support
- Taurine included, which is a positive in grain-free diets
- Pea and lentil inclusion noted — monitor DCM research updates
Salmon, salmon meal, sweet potatoes, potatoes, peas, fish meal, canola oil (preserved with mixed tocopherols), pea flour, dried beet pulp, natural flavor, flaxseed, salmon oil (a source of DHA), salt, potassium chloride, DL-Methionine, dicalcium phosphate, choline chloride, taurine, blueberries, raspberries, tomatoes, dried chicory root, yucca schidigera extract, dried Lactobacillus plantarum fermentation product, dried Bacillus subtilis fermentation product, dried Lactobacillus acidophilus fermentation product, dried Enterococcus faecium fermentation product, dried Bifidobacterium animalis fermentation product, vitamin E supplement, iron proteinate, zinc proteinate, copper proteinate, ferrous sulfate, zinc sulfate, manganese sulfate, copper sulfate, potassium iodide, thiamine mononitrate, manganese proteinate, ascorbic acid (preservative), vitamin A supplement, biotin, niacin, calcium pantothenate, sodium selenite, pyridoxine hydrochloride, vitamin B12 supplement, riboflavin, vitamin D3 supplement, folic acid.
- Lower protein/fat compared to chicken — useful for weight-prone dogs
- Good novel protein option for dogs sensitive to chicken
- Contains taurine and glucosamine/chondroitin at this price tier
Lamb, lamb meal, whole grain brown rice, ground white rice, rice bran, egg product, peas, pea flour, dried yeast, chicken fat (preserved with mixed tocopherols), cracked pearled barley, dried beet pulp, flaxseed, potatoes, natural flavor, fish meal, millet, potassium chloride, salt, DL-Methionine, choline chloride, taurine, carrots, dried kelp, apples, cranberries, rosemary extract, parsley flakes, dried chicory root, glucosamine hydrochloride, dried Lactobacillus plantarum fermentation product, dried Bacillus subtilis fermentation product, dried Lactobacillus acidophilus fermentation product, dried Enterococcus faecium fermentation product, dried Bifidobacterium animalis fermentation product, vitamin E supplement, iron proteinate, zinc proteinate, copper proteinate, ferrous sulfate, zinc sulfate, manganese sulfate, copper sulfate, potassium iodide, thiamine mononitrate, manganese proteinate, chondroitin sulfate, ascorbic acid, vitamin A supplement, biotin, niacin, calcium pantothenate, sodium selenite, pyridoxine hydrochloride, vitamin B12 supplement, riboflavin, vitamin D3 supplement, folic acid.
To fully evaluate Costco dog food, we need to look beyond the guaranteed analysis and examine the nutritional components of these recipes.
Kirkland Signature formulas typically use named animal meals such as chicken meal or salmon meal as their primary protein sources. Meat meals are concentrated protein ingredients because the moisture has been removed, providing more protein per gram than fresh meat.
These proteins supply essential amino acids needed for:
- Muscle maintenance
- Immune function
- Skin and coat health
- Tissue repair
Protein levels ranging from 24 to 28% fall within a healthy range for most adult dogs and are comparable to many other low to mid-range dog foods.
Some consumers prefer whole meats rather than meat meals as the first ingredient. While understandable, properly sourced meat meals are widely used in premium kibble and can be nutritionally excellent.
Many Costco formulas include brown rice and barley. These grains provide digestible carbohydrates for energy while contributing dietary fibre, B vitamins, and trace minerals.
Like most kibble diets, carbohydrate ingredients are finely ground before extrusion. While this improves digestibility, it also increases the rate at which starch may be absorbed compared with minimally processed whole foods.
Fat levels typically range from 14 to 17%, providing adequate energy and essential fatty acids.
- Energy
- Essential fatty acids
- Healthy skin and coat support
Ingredients such as chicken fat, fish meal, and flaxseed contribute beneficial omega fatty acids.
Like nearly all commercial dog foods, Kirkland Signature relies on a vitamin and mineral premix to ensure the diets consistently meet AAFCO nutrient requirements.
While whole-food nutrients are desirable, supplementation helps guarantee nutrient consistency from batch to batch.
This includes nutrients such as:
- Vitamin A
- Vitamin D
- Zinc
- Iron
- Selenium
Low to moderate protein levels suitable for most healthy adult dogs.
Moderate fat content provides energy while remaining appropriate for many weight-prone dogs.
Supports digestive health and helps maintain normal stool quality.
Typical moisture level for dry kibble. Dogs should always have access to fresh water, and adding wet food or fresh toppers can increase daily moisture intake.
One of the most important considerations when evaluating dog food is the brand’s safety history.
Kirkland Signature dog food has been associated with a few recalls in the past because it is manufactured by Diamond Pet Foods, which experienced recalls in 2012 due to potential salmonella contamination.
Since then, manufacturing standards and safety protocols have significantly improved across the industry.
Diamond Pet Foods now operates under modern food safety programs that include:
- Hazard analysis and preventive controls
- Ingredient testing
- Finished product testing
- Environmental monitoring
These systems help reduce the risk of contamination and ensure consistent product safety.
Kirkland Signature is consistently one of the best-value kibbles on the Canadian market. Here is how the cost stacks up against comparable options.
- Named animal meal proteins
- AAFCO compliant
- Probiotics included
- Available at Costco Canada
- Often similar ingredients
- More marketing spend
- Wider formula variety
- Sold at pet specialty retailers
- Higher ingredient transparency
- Smaller batch production
- Full nutrient panels available
- Often Canadian-made options
Want to explore other well-priced options? Read my review of Nutrience dog food, Nutram pet products, and the best Canadian pet food brands for a broader comparison.
Large scale retailers like Costco can also influence sustainability through their supply chains. Some sustainability advantages include:
- Excellent price-to-nutrition value
- Named animal protein ingredients
- AAFCO compliant formulas
- Widely available across Canada
- Limited nutrient panel transparency
- Third-party manufacturer (Diamond)
- Smaller product selection
- Not ideal for dogs with medical needs
Costco dog food earns an 6.9 out of 10 for offering nutritionally balanced diets at one of the best price points in the industry. While it may lack some of the transparency and specialization of premium brands, it remains one of the most practical and accessible kibble options available for dog owners today.