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 six dry dog foods, five claimed to meet AAFCO nutrient profiles for all life stages and one for adult maintenance.
The following is a list of recipes available at the time of this review.
- Nature’s Domain Turkey Meal and Sweet Potato
- Nature’s Domain Duck Meal and Garbanzo Bean
- Nature’s Domain Salmon Meal and Sweet Potato
- Nature’s Domain Puppy Chicken and Pea (4 stars)
- Nature’s Domain Organic Chicken and Pea (3 stars)
- Nature’s Domain Beef Meal and Sweet Potato (3 stars)
Kirkland Signature Nature’s Domain Turkey Meal and Sweet Potato was selected to represent the other products in the line for this review.
Nature's Domain 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 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 (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 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 includes 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 27% and a mean fat level of 15%. Together, these figures suggest a carbohydrate content of 50% for the overall product line.
And a fat-to-protein ratio of about 57%.
Near-average protein. Near-average fat. And near-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 grain-free plant-based dry dog food using a moderate amount of various named species 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.
Kirkland Signature Dog Food
The following list (if present) includes all dog food recalls since 2009 directly related to this 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)
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Notes and Updates
03/02/2016 Last Update
- Association of American Feed Control Officials ↩