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Nulo vs Kirkland Signature

Nulo vs. Kirkland Signature

In this comparison article for Nulo vs Kirkland Signature, we'll highlight the key differences between these two pet food brands. To properly compare Nulo 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 Nulo comparison, we've utilized average data to make general comparisons. If you'd like to see individual product reviews, visit our Nulo Review Page or Kirkland Signature Review Page.

Guaranteed Analysis: Kirkland Signature vs. Nulo

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.

Nulo Dog Food vs. Kirkland Signature Dog Food

Dry Dog Food Nulo Kirkland Signature
Crude Protein 35.8% 27.5%
Crude Fat 19.7% 15.3%
Crude Fiber 5.1% 5.4%
Wet/Canned Dog Food Nulo Kirkland Signature
Crude Protein 45.7% 44.4%
Crude Fat 32.4% 27.8%
Crude Fiber 5.5% 5.6%

Crude Protein Comparison For Dog Food

Protein is an extremely important part of your dog's diet. Without sufficient protein, dogs can develop a wide-range of serious health problems.

Nulo dry dog foods clearly provides more protein than Kirkland Signature. In fact, the difference between the protein content is roughly 8.32%, which is a significant amount. For wet dog foods, Nulo and Kirkland Signature provide roughly the same amount of protein.


Crude Fat Comparison For Dog Food

Dietary fats serves a multitude of roles in the proper development and function of our canine companions. Here are some of the benefits (not exhaustive):

  • Help produce prostaglandins, which reduce inflammation among other critical functions.
  • Aid in the absorption of fat-soluble vitamins
  • Improve skin and coat health
  • Improve the palatially of your dog's food

Kirkland Signature dry recipes contain 4.37% less fat than Nulo dry recipes. This difference in fat content is a notable difference between Nulo and Kirkland Signature. In addition, Nulo wet dog foods also provide more fat than Kirkland Signature wet foods.


Both brands provide roughly the same amount of crude fiber. With regards to wet dog food, Kirkland Signature and Nulo also provide roughly the same amount of crude fiber.

Nulo Cat Food vs. Kirkland Signature Cat Food

Dry Cat Food Nulo Kirkland Signature
Crude Protein 44.5% 34.8%
Crude Fat 20.6% 15.9%
Crude Fiber 4.8% 5.9%

Crude Protein Comparison For Cat Food

Protein is an extremely important part of your cat's diet. Without sufficient protein, cats can develop a wide-range of serious health problems.

On average, Nulo dry cat food recipes contain 9.66% more protein than Kirkland Signature recipes. Clearly, there is a significant difference between the protein content of Kirkland Signature and Nulo.


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):

  • Aid in the digestion and absorption of fat-soluble vitamins
  • Improve the health of skin/coat
  • Slow the growth of yeast infections
  • Slow the development and spread of certain type of cancers.
  • Maintain healthy blood pressure

The table shows that Kirkland Signature provides far less fat than Nulo. The difference in fat content is roughly 4.66%.


As you can see, Nulo and Kirkland Signature guarantee a similar amount of crude fiber.

Nulo Pet Food Ingredients vs. Kirkland Signature Pet Food Ingredients

Here are some of the controversial ingredients used only by Nulo.

Canola Oil (Preserved With Mixed Tocopherols And Citric Acid)

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

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

Product Safety: Recall History of Nulo & Kirkland Signature?

According to our records, neither brand has issued any product recalls. Therefore, consumers have no reason to question the safety of Nulo 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 Nulo Pet Foods

You can purchase Nulo pet foods from the following stores:


72 Recipes In-Stock Today

38 Recipes In-Stock Today

45 Recipes In-Stock Today

26 Recipes In-Stock Today

Where To Buy Kirkland Signature Pet Foods

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


Type Of Pet Foods Available

Product Nulo Kirkland Signature
Dry Dog Food 28 Recipes 12 Recipes
Wet Dog Food 19 Recipes 1 Recipes
Dog Treats 8 Treats
Dry Cat Food 12 Recipes 3 Recipes
Wet Cat Food 24 Recipes
Cat Treats

Compare Pet Food Prices Across Multiple Pet Stores