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Kirkland Signature vs Hill's Science Diet

Kirkland Signature vs. Hill's Science Diet

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

Guaranteed Analysis: Hill's Science Diet vs. Kirkland Signature

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.

Kirkland Signature Dog Food vs. Hill's Science Diet Dog Food

Dry Dog Food Kirkland Signature Hill's Science Diet
Crude Protein 27.5% 24.6%
Crude Fat 15.3% 14.6%
Crude Fiber 5.4% 3.7%
Wet/Canned Dog Food Kirkland Signature Hill's Science Diet
Crude Protein 44.4% 25.8%
Crude Fat 27.8% 17.4%
Crude Fiber 5.6% 3.5%

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 Kirkland Signature and Hill's Science Diet. We can see that Kirkland Signature guarantees about 2.92% more protein than Hill's Science Diet. In addition, Kirkland Signature wet dog foods also provide more protein than Hill's Science Diet 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.

There is a relatively insignificant difference between the crude fat content of the two brands. For wet dog foods, Kirkland Signature provides significantly more fat (about 10.42% more).


Both brands provide roughly the same amount of crude fiber. For wet dog foods, Kirkland Signature typically provides a little more fiber (about 2.03% more).

Kirkland Signature Cat Food vs. Hill's Science Diet Cat Food

Dry Cat Food Kirkland Signature Hill's Science Diet
Crude Protein 34.8% 35.0%
Crude Fat 15.9% 18.5%
Crude Fiber 5.9% 4.5%

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.

As you can see, Kirkland Signature and Hill's Science Diet guarantee a similar amount of crude protein.


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.

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


Hill's Science Diet and Kirkland Signature both provide roughly the same amount of crude fiber.

Kirkland Signature Pet Food Ingredients vs. Hill's Science Diet Pet Food Ingredients

Kirkland Signature and Hill's Science Diet both use the following controversial ingredients in many of their products:

Pea Protein
Tomato Pomace
Powdered Cellulose

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

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

Here are some of the controversial ingredients used only by Hill's Science Diet.

Liver
Caramel
Corn Flour
Iron Oxide
Pork Plasma
Poultry Fat
Animal Liver
Brewers Rice
Wheat Gluten
Caramel Color
Beef By-Products
Corn Gluten Meal
Pork By-Products
Whole Grain Corn
Whole Grain Wheat
Dried Tomato Pomace
Pea Protein Concentrate
Soybean Protein Isolate

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 Hill's Science Diet.

Menadione Sodium Bisulfite Complex

Product Safety: Recall History of Kirkland Signature & Hill's Science Diet?

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

Hill's Science Diet has been recalled 2 times.

  • Jan. 31, 2019: elevated levels of Vitamin D
  • March 20, 2019: elevated levels of Vitamin D

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 Kirkland Signature Pet Foods

You can purchase Kirkland Signature pet foods from the following stores:


Where To Buy Hill's Science Diet Pet Foods

You can purchase Hill's Science Diet pet food products from these retailers:


135 Recipes In-Stock Today

133 Recipes In-Stock Today

96 Recipes In-Stock Today

Type Of Pet Foods Available

Product Kirkland Signature Hill's Science Diet
Dry Dog Food 12 Recipes 48 Recipes
Wet Dog Food 1 Recipes 34 Recipes
Dog Treats 18 Treats
Dry Cat Food 3 Recipes 25 Recipes
Wet Cat Food 48 Recipes
Cat Treats

Compare Pet Food Prices Across Multiple Pet Stores