Primal vs Hill's Science Diet

Primal vs. Hill's Science Diet

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

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Guaranteed Analysis: Hill's Science Diet vs. Primal

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.

Primal Dog Food vs. Hill's Science Diet Dog Food

Dry Dog Food Primal Hill's Science Diet
Crude Protein 49.7% 24.5%
Crude Fat 32.1% 14.8%
Crude Fiber 4.1% 4.3%

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.

When you look at the average percentages of crude protein for dry dog food, it's clear that Primal provides significantly more protein. On average, Primal guarantees about 25.11% more protein than Hill's Science Diet.


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.

The comparison table above shows that Primal dry dog foods provide significantly more fat than Hill's Science Diet. More specifically, Primal guarantees at least 17.34% more fat.


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

Primal Cat Food vs. Hill's Science Diet Cat Food

Dry Cat Food Primal Hill's Science Diet
Crude Protein 54.7% 35.2%
Crude Fat 28.8% 18.5%
Crude Fiber 3.9% 5.8%

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.

Primal dry cat foods clearly provides more protein than Hill's Science Diet. In fact, the difference between the protein content is roughly 19.48%, which is a significant amount.


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.

On average, Primal dry cat food recipes contain 10.31% more fat than Hill's Science Diet recipes. Clearly, there is a significant difference between the fat content of Hill's Science Diet and Primal.


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

Primal Pet Food Ingredients vs. Hill's Science Diet Pet Food Ingredients

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

Liver
Caramel
Corn Flour
Iron Oxide
Pea Protein
Pork Plasma
Poultry Fat
Animal Liver
Brewers Rice
Wheat Gluten
Caramel Color
Tomato Pomace
Beef By-Products
Corn Gluten Meal
Pork By-Products
Whole Grain Corn
Whole Grain Wheat
Powdered Cellulose
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 Primal & Hill's Science Diet?

Primal has been recalled 2 times.

  • March 13, 2015: low thiamine level
  • Dec. 22, 2017: incorrect bone grind size

According to our records, Hill's Science Diet has never been recalled.

Price Comparison: Which Brand Is More Expensive?

Dry Dog Food Primal Hill's Science Diet
Per Pound $39.50 $1.89
Per Calorie $0.0148 $0.0012
Dry Cat Food Primal Hill's Science Diet
Per Pound $39.46 $2.81
Per Calorie $0.0163 $0.0017

The average cost-per-lb is heavily influenced by the varying amounts of moisture present in each brand's food products (wet vs. dry food, dry vs. freeze-dried food, etc). However, the average cost-per-kcal eliminates the influence of moisture. Therefore, the average cost-per-kcal is the better metric to consider.

If you'd like to calculate the average cost-per-day or cost-pet-year of feeding Primal or Hill's Science Diet, input your pet's weight into our cost analyzer widget.

Averages price data can identify whether or not there exists a significant price difference between two brands. However, the actual price that you'll pay for Primal or Hill's Science Diet will depend on your shopping habits.

Pet owners who use our price comparison feature typically save more than 25% off retail prices for Primal and Hill's Science Diet. In addition, we currently have some great coupons for our readers.


Disclosure: PawDiet has an affiliate relationship with retailers featured in this article. We are compensated for referring customers. Thank you for shopping with our retail partners!

Where To Buy Primal Pet Foods

You can purchase Primal 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:









Type Of Pet Foods Available

Product Primal Hill's Science Diet
Dry Dog Food 32 Recipes
Wet Dog Food 31 Recipes
Dog Treats 8 Treats 15 Treats
Dry Cat Food 18 Recipes
Wet Cat Food 39 Recipes
Cat Treats

Compare Pet Food Prices Across Multiple Pet Stores

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