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By Nature vs Kirkland Signature

By Nature vs. Kirkland Signature

In this comparison article for By Nature vs Kirkland Signature, we'll highlight the key differences between these two pet food brands. To properly compare By Nature and Kirkland Signature, we'll use up-to-date nutritional and price information.

There are many factors to consider when choosing the best pet food brand for your pet. Factors such as ingredient quality, guaranteed analysis, product safety, brand history, and cost are among the most important factors to consider.

Throughout this Kirkland Signature vs By Nature comparison, we've utilized average data to make general comparisons. If you'd like to see individual product reviews, visit our By Nature Review Page or Kirkland Signature Review Page.

Guaranteed Analysis: Kirkland Signature vs. By Nature

According to AAFCO, all pet food labels must provide a guaranteed analysis of nutrient content. The analysis must provide guaranteed minimum percentages of crude protein and crude fat, and maximum percentages of crude fiber and moisture.

All percentages used in this comparison are averages reported on a dry matter basis.

By Nature Dog Food vs. Kirkland Signature Dog Food

Dry Dog FoodBy NatureKirkland Signature
Crude Protein31.0%27.5%
Crude Fat18.1%15.3%
Crude Fiber4.6%5.4%

Crude Protein Comparison For Dog Food

Dogs require twenty-two amino acids to sustain life. Twelve of these amino acids are synthesized naturally, the remaining ten are consumed. Protein is the nutrient which provides some or all of these ten essential amino acids.

There is a small difference between the protein content of By Nature and Kirkland Signature. We can see that By Nature guarantees about 3.47% more protein than Kirkland Signature.


Crude Fat Comparison For Dog Food

Fats are an absolutely vital component of a balanced canine diet. Not only do fats provide energy, but they also serve important roles in the normal development and function of your dog's body. For example, fats help dogs produce prostaglandins, which reduce inflammation among many other significant functions.

According to our average data, Kirkland Signature typically provides less fat than By Nature. However, this difference is relatively small and doesn't represent a significant difference between the two brands.


There is a relatively insignificant difference between the crude fiber content of the two brands.

By Nature Cat Food vs. Kirkland Signature Cat Food

Dry Cat FoodBy NatureKirkland Signature
Crude Protein38.9%34.8%
Crude Fat18.9%15.9%
Crude Fiber4.4%5.9%

Crude Protein Comparison For Cat Food

Cats require twenty-two amino acids to sustain life. Eleven of these amino acids are synthesized naturally, the remaining eleven are consumed. Protein is the nutrient which provides some or all of these eleven essential amino acids.

There is a relatively large difference between the protein content of By Nature and Kirkland Signature. On average, Kirkland Signature dry cat food recipes contain 4.07% less protein than By Nature recipes.


Crude Fat Comparison For Cat Food

There are many ways in which dietary fat contributes to the overall health of our feline friends. Here is a short list of benefits provided by fats (not exhaustive):

  • Fats help with the digestion and absorption of fat-soluble vitamins
  • Reduce inflammation associated with arthritis
  • Slow the growth of yeast infections
  • Prevent or reduce the likelihood of certain heart problems.
  • Aid in the development of the retina and visual cortex.

If you look at the average percentages of crude fat, you'll notice that By Nature typically guarantees 2.96% more fat. This is a fairly small difference between By Nature and Kirkland Signature, but still worth mentioning.


Both brands provide roughly the same amount of crude fiber.

By Nature Pet Food Ingredients vs. Kirkland Signature Pet Food Ingredients

By Nature and Kirkland Signature both use the following controversial ingredients in many of their products:

Pea Protein
Tomato Pomace
Canola Oil (Preserved With Mixed Tocopherols)

Here are some of the controversial ingredients used only by By Nature.

Rice Hulls
Vegetable Oil

Here are some of the controversial ingredients used only by Kirkland Signature.

Canola Oil
Powdered Cellulose
Organic Canola Meal
Organic Pea Protein
Organic Canola Oil (Preserved With Mixed Tocopherols)

We believe that certain pet food ingredients are linked to adverse health affects; these ingredients are classified as harmful.

Here are some of the harmful ingredients used only by By Nature.

Menadione Sodium Bisulfite Complex

Product Safety: Recall History of By Nature & Kirkland Signature?

According to our records, neither brand has issued any product recalls. Therefore, consumers have no reason to question the safety of By Nature or Kirkland Signature pet food products.


Disclosure: PawDiet has an affiliate relationship with stores featured (or linked-to) in this article. We are compensated for referring customers. Thank you for shopping with our retail partners!

Where To Buy By Nature Pet Foods

You can purchase By Nature pet foods from the following stores:


Where To Buy Kirkland Signature Pet Foods

You can purchase Kirkland Signature pet food products from these retailers:


Type Of Pet Foods Available

ProductBy NatureKirkland Signature
Dry Dog Food4 Recipes12 Recipes
Wet Dog FoodNone1 Recipes
Dog TreatsNoneNone
Dry Cat Food2 Recipes3 Recipes
Wet Cat FoodNoneNone
Cat TreatsNoneNone

Top Rated By Nature Recipes

Dog Food
By Nature
Super Fusion Turkey & Duck Meal Recipe For Dogs
Check Price
Dog Food
By Nature
Super Fusion Chicken Meal & Turkey Meal With Brown Rice Recipe For Dogs
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Cat Food
By Nature
Super Fusion Chicken & Turkey Meal Recipe For Cats
Check Price
Cat Food
By Nature
Super Fusion Salmon & Menhaden Fish Meal Recipe For Cats
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Top Rated Kirkland Signature Recipes

Dog Food
Kirkland Signature
(Costco) Super Premium Lamb, Rice & Vegetable Formula For Adult Dogs
Check Price
Dog Food
Kirkland Signature
(Costco) Super Premium Chicken, Rice & Vegetable Formula For Puppies
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Dog Food
Kirkland Signature
(Costco) Nature's Domain Turkey & Pea Stew For Dogs
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Cat Food
Kirkland Signature
(Costco) Nature's Domain Salmon Meal & Sweet Potato Recipe Cat Food
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