Hill's Science Diet vs. Purina Pro Plan

Hill's Science Diet vs Purina Pro Plan

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

Guaranteed Analysis: Purina Pro Plan vs. Hill's Science Diet

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.

Hill's Science Diet Dog Food vs. Purina Pro Plan Dog Food

Dry Dog Food Hill's Science Diet Purina Pro Plan
Crude Protein 24.5% 31.7%
Crude Fat 14.8% 17.7%
Crude Fiber 4.3% 4.3%
Wet/Canned Dog Food Hill's Science Diet Purina Pro Plan
Crude Protein 25.8% 47.3%
Crude Fat 17.1% 16.4%
Crude Fiber 3.8% 7.2%

Crude Protein Comparison For Dog Food

Dogs require twenty-two amino acids to sustain life. Eleven 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.

The table shows that Hill's Science Diet provides far less protein than Purina Pro Plan. The difference in protein content is roughly 7.15%. In addition, Purina Pro Plan wet dog foods also provide more protein than Hill's Science Diet wet foods.


Crude Fat Comparison For Dog Food

Like protein, fats are an essential part of a dog's body. Fats are needed for the proper development and function of the canine body.

If you look at the average percentages of crude fat, you'll notice that Purina Pro Plan typically guarantees 2.97% more fat. This is a fairly small difference between Purina Pro Plan and Hill's Science Diet, but still worth mentioning. For wet dog foods, Hill's Science Diet and Purina Pro Plan provide roughly the same amount of fat.


As you can see, Purina Pro Plan and Hill's Science Diet guarantee a similar amount of crude fiber. For wet dog foods, Purina Pro Plan typically provides a little more fiber (about 3.40% more).

Hill's Science Diet Cat Food vs. Purina Pro Plan Cat Food

Dry Cat Food Hill's Science Diet Purina Pro Plan
Crude Protein 34.6% 45.9%
Crude Fat 18.4% 17.3%
Crude Fiber 6.0% 3.5%
Wet/Canned Cat Food Hill's Science Diet Purina Pro Plan
Crude Protein 38.5% 51.6%
Crude Fat 22.0% 16.9%
Crude Fiber 4.4% 7.0%

Crude Protein Comparison For Cat Food

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

On average, Purina Pro Plan dry cat food recipes contain 11.36% more protein than Hill's Science Diet recipes. Clearly, there is a significant difference between the protein content of Hill's Science Diet and Purina Pro Plan. Similarly, Purina Pro Plan wet cat foods provide significantly more protein than Hill's Science Diet wet foods.


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):

  • Help transport nutrients across cell membranes
  • Fats produce metabolites, which help control inflammation
  • Maintain healthy blood pressure
  • Slow the growth of yeast infections
  • Fats improve the taste/texture of food.

Purina Pro Plan and Hill's Science Diet both provide roughly the same amount of crude fat. For wet cat foods, Hill's Science Diet provides more fat (about 5.04% more).


According to our data, Hill's Science Diet guarantees 2.47% more protein than Purina Pro Plan. Although this difference is relatively small, it's still a notable difference. In addition, Purina Pro Plan wet cat foods also provide more fiber than Hill's Science Diet wet foods.

Hill's Science Diet Pet Food Ingredients vs. Purina Pro Plan Pet Food Ingredients

Hill's Science Diet and Purina Pro Plan both use the following controversial ingredients in many of their products:

Liver
Pea Protein
Brewers Rice
Wheat Gluten
Caramel Color
Corn Gluten Meal
Whole Grain Corn
Whole Grain Wheat
Powdered Cellulose
Soybean Protein Isolate

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

Caramel
Corn Flour
Iron Oxide
Pork Plasma
Poultry Fat
Animal Liver
Tomato Pomace
Beef By-Products
Pork By-Products
Dried Tomato Pomace
Pea Protein Concentrate

Here are some of the controversial ingredients used only by Purina Pro Plan.

Poultry
Canola Oil
Canola Meal
Ground Wheat
Animal Digest
Garlic Powder
Soybean Flour
Soybean Hulls
Corn Germ Meal
Poultry Giblets
Dried Corn Syrup
Meat By-Products
Ground Yellow Corn
Chicken By-Products
Poultry By-Products
Chicken By-Product Meal
Poultry By-Product Meal
Soybean Protein Concentrate
Animal Fat (Preserved With Mixed Tocopherols)

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

Hill's Science Diet and Purina Pro Plan both use the following harmful ingredients in many of their products:

Menadione Sodium Bisulfite Complex

Here are some of the harmful ingredients used only by Purina Pro Plan.

Bha
Red 3
Corn Oil
Yellow 5
Added Color

Product Safety: Recall History of Hill's Science Diet & Purina Pro Plan?

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

Purina Pro Plan has been recalled once.

  • March 9, 2016: Incorrect Vitamins and Minerals

Price Comparison: Which Brand Is More Expensive?

Dry Dog Food Hill's Science Diet Purina Pro Plan
Per Pound $1.88 $1.94
Per Calorie $0.0012 $0.0011
Dry Cat Food Hill's Science Diet Purina Pro Plan
Per Pound $2.78 $2.59
Per Calorie $0.0017 $0.0014
Wet Dog Food Hill's Science Diet Purina Pro Plan
Per Pound $2.85 $2.80
Per Calorie $0.0073 $0.0062
Wet Cat Food Hill's Science Diet Purina Pro Plan
Per Pound $4.18 $4.72
Per Calorie $0.0078 $0.0112

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 Hill's Science Diet or Purina Pro Plan, 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 Hill's Science Diet or Purina Pro Plan will depend on your shopping habits.

Pet owners who use our price comparison feature typically save more than 25% off retail prices for Hill's Science Diet and Purina Pro Plan. 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 Hill's Science Diet and Purina Pro Plan Pet Foods

You can purchase Hill's Science Diet pet foods from the following stores:


You can purchase Purina Pro Plan pet food products from these retailers:

 

Type Of Pet Foods Available

Product Hill's Science Diet Purina Pro Plan
Dry Dog Food 32 Recipes 39 Recipes
Wet Dog Food 30 Recipes 29 Recipes
Dog Treats 15 Treats 2 Treats
Dry Cat Food 18 Recipes 23 Recipes
Wet Cat Food 39 Recipes 68 Recipes
Cat Treats 9 Treats

Compare Pet Food Prices Across Multiple Pet Stores