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Castor & Pollux vs Kirkland Signature

Castor & Pollux vs. Kirkland Signature

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

Guaranteed Analysis: Kirkland Signature vs. Castor & Pollux

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.

Castor & Pollux Dog Food vs. Kirkland Signature Dog Food

Dry Dog Food Castor & Pollux Kirkland Signature
Crude Protein 33.1% 27.5%
Crude Fat 16.9% 15.3%
Crude Fiber 4.1% 5.4%
Wet/Canned Dog Food Castor & Pollux Kirkland Signature
Crude Protein 39.9% 44.4%
Crude Fat 23.5% 27.8%
Crude Fiber 6.5% 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.

Our analysis shows that Castor & Pollux guarantees 5.57% more protein than Kirkland Signature dry dog food recipes. In addition, Kirkland Signature wet dog foods also provide more protein than Castor & Pollux wet foods.


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.

Kirkland Signature and Castor & Pollux both provide roughly the same amount of crude fat. For wet dog foods, Kirkland Signature provides more fat (about 4.32% more).


There is a relatively insignificant difference between the crude fiber content of the two brands. With regards to wet dog food, Castor & Pollux and Kirkland Signature also provide roughly the same amount of crude fiber.

Castor & Pollux Cat Food vs. Kirkland Signature Cat Food

Dry Cat Food Castor & Pollux Kirkland Signature
Crude Protein 38.2% 34.8%
Crude Fat 15.7% 15.9%
Crude Fiber 4.0% 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.

According to our data, Castor & Pollux guarantees 3.39% more protein than Kirkland Signature. Although this difference is relatively small, it's still a notable difference.


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.

Both brands provide roughly the same amount of crude fat.


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

Castor & Pollux Pet Food Ingredients vs. Kirkland Signature Pet Food Ingredients

Castor & Pollux and Kirkland Signature both use the following controversial ingredients in many of their products:

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

Here are some of the controversial ingredients used only by Castor & Pollux.

Garlic
Caramel
Garlic Powder
Organic Caramel Color
Organic Garlic Powder
Pea Protein Concentrate
Canola Oil (Preserved With Mixed Tocopherols And Citric Acid)

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

Canola Oil
Organic Canola Meal
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 Castor & Pollux.

Menadione Sodium Bisulfite Complex

Product Safety: Recall History of Castor & Pollux & Kirkland Signature?

Castor & Pollux has been recalled once.

  • May 23, 2018: elevated levels of beef thyroid hormone

According to our records, Kirkland Signature has never been recalled.


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 Castor & Pollux Pet Foods

You can purchase Castor & Pollux pet foods from the following stores:


57 Recipes In-Stock Today

25 Recipes In-Stock Today

51 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 Castor & Pollux Kirkland Signature
Dry Dog Food 14 Recipes 12 Recipes
Wet Dog Food 28 Recipes 1 Recipes
Dog Treats 22 Treats
Dry Cat Food 6 Recipes 3 Recipes
Wet Cat Food 18 Recipes
Cat Treats 1 Treats

Compare Pet Food Prices Across Multiple Pet Stores