Kirkland Signature Nature’s Domain Dog Food earns the Advisor’s mid-tier rating of 3.5 stars.
The Kirkland Signature Nature’s Domain product line includes four dry dog foods, each claimed to meet AAFCO nutrient profiles for all life stages.
The following is a list of recipes available at the time of this review.
- Nature’s Domain Grain Free Turkey Meal and Sweet Potato
- Nature’s Domain Grain Free Salmon Meal and Sweet Potato
- Nature’s Domain Grain Free Organic Chicken and Pea (3 stars)
- Nature’s Domain Grain Free Beef Meal and Sweet Potato (3 stars)
Nature’s Domain Grain Free Turkey Meal and Sweet Potato was selected to represent the other products in the line for this review.
Kirkland Signature Nature's Domain Grain Free Turkey Meal and Sweet Potato
Dry Dog Food
Estimated Dry Matter Nutrient Content
Ingredients: Turkey meal, sweet potatoes, peas, potatoes, canola oil, potato protein, potato fiber, natural flavor, flaxseed, ocean fish meal, salt, choline chloride, dried chicory root, tomatoes, blueberries, raspberries, Yucca schidigera extract, dried Enterococcus faecium fermentation product, dried Lactobacillus acidophilus fermentation product, dried Lactobacillus casei fermentation product, dried Lactobacillus plantarum fermentation product, dried Trichoderma longibrachiatum fermentation extract, vitamin E supplement, iron proteinate, zinc proteinate, copper proteinate, ferrous sulfate, zinc sulfate, copper sulfate, potassium iodide, thiamine mononitrate (vitamin B1), manganese proteinate, manganous oxide, ascorbic acid, vitamin A supplement, biotin, niacin, calcium pantothenate, manganese sulfate, sodium selenite, pyridoxine hydrochloride (vitamin B6), vitamin B12 supplement, riboflavin (vitamin B2), vitamin D supplement, folic acid
Fiber (estimated dry matter content) = 3.3%
Red items when present indicate controversial ingredients
|Estimated Nutrient Content|
|Dry Matter Basis||27%||16%||50%|
|Calorie Weighted Basis||23%||33%||44%|
The first ingredient in this dog food is turkey meal. Turkey meal is considered a meat concentrate and contains nearly 300% more protein than fresh turkey.
The second ingredient is sweet potato. Sweet potatoes are a gluten-free source of complex carbohydrates in a dog food. They are naturally rich in dietary fiber and beta carotene.
The third ingredient is peas. Peas 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.
The fourth 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 fifth ingredient is canola oil. Unfortunately, canola can be a controversial item. That’s because it can sometimes (but not always) be derived from genetically modified rapeseed.
Yet others cite the fact canola oil can be a significant source of essential omega-3 fatty acids.
In any case, plant-based oils like canola are less biologically available to a dog than fish oil as a source of quality omega-3 fats.
The sixth ingredient is potato protein, the dry residue remaining after removing the starchy part of a potato.
Even though it contains over 80% protein, this ingredient would be expected to have a lower biological value than meat.
And less costly plant-based products like this can notably boost the total protein reported on the label — a factor that must be considered when judging the actual meat content of this dog food.
The seventh ingredient is potato fiber, a source of dietary fiber. Fiber in reasonable amounts can help stabilize blood sugar levels and reduce a dog food’s caloric content.
After the natural flavor, we find flaxseed, 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.
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 three notable exceptions…
First, we note the use of ocean 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.
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.
Kirkland Signature Nature’s Domain Dog Food
The Bottom Line
Judging by its ingredients alone, Kirkland Signature Nature’s Domain looks like an above-average dry dog food.
But ingredient quality by itself cannot tell the whole story. We still need to estimate the product’s meat content before determining a final rating.
As a group, the brand features an average protein content of 26% and a mean fat level of 15%. Together, these figures suggest a carbohydrate content of 51% for the overall product line.
And a fat-to-protein ratio of about 57%.
Near-average protein. Near-average fat. And above-average carbs when compared to a typical dry dog food.
When you consider the protein-boosting effect of the peas, potato protein and flaxseed in this recipe and the plant-based protein boosters in the others, this looks like the profile of a kibble containing just a moderate amount of meat.
Kirkland Signature Nature’s Domain is a plant-based dry dog food using a moderate amount of various named meats as its main sources of animal protein, thus earning the brand 3.5 stars.
Please note certain recipes are sometimes given a higher or lower rating based upon our estimate of their total meat content and (when appropriate) their fat-to-protein ratios.
A Final Word
The descriptions and analyses expressed in this and every article on this website represent the views and opinions of the author.
Although it's our goal to ensure all the information on this website is correct, we cannot guarantee its completeness or its accuracy; nor can we commit to ensuring all the material is kept up-to-date on a daily basis.
Each review is offered in good faith and has been designed to help you make a more informed decision when buying dog food.
However, due to the biological uniqueness of every animal, none of our ratings are intended to suggest feeding a particular product will result in a specific dietary response or health benefit for your pet.
For a better understanding of how we analyze each product, please read our article, "The Problem with Dog Food Reviews".
Remember, no dog food can possibly be appropriate for every life stage, lifestyle or health condition. So, choose wisely. And when in doubt, consult a qualified veterinary professional for help.
In closing, we do not accept money, gifts or samples from pet food companies in exchange for special consideration in the preparation of our reviews or ratings.
To learn how we support the cost of operating this website, please visit our public Disclosure and Disclaimer page.
Have an opinion about this dog food? Or maybe the review itself? Please know we welcome your comments.
Notes and Updates
08/28/2014 Last Update
- Association of American Feed Control Officials ↩