Hill's Science Diet vs Iams

Hill's Science Diet vs. Iams

In this comparison article for Hill's Science Diet vs Iams, we'll highlight the key differences between these two pet food brands. To properly compare Hill's Science Diet and Iams, 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 Iams 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 Iams Review Page.

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Guaranteed Analysis: Iams 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. Iams Dog Food

Dry Dog Food Hill's Science Diet Iams
Crude Protein 24.5% 27.4%
Crude Fat 14.8% 14.5%
Crude Fiber 4.3% 5.1%
Wet/Canned Dog Food Hill's Science Diet Iams
Crude Protein 26.0% 42.0%
Crude Fat 17.2% 24.0%
Crude Fiber 3.9% 5.8%

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 Iams and Hill's Science Diet. We can see that Iams guarantees about 2.88% more protein than Hill's Science Diet. In addition, Iams 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, Iams provides more fat (about 6.83% more).


Both brands provide roughly the same amount of crude fiber. With regards to wet dog food, Iams and Hill's Science Diet also provide roughly the same amount of crude fiber.

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

Dry Cat Food Hill's Science Diet Iams
Crude Protein 35.2% 36.1%
Crude Fat 18.5% 16.4%
Crude Fiber 5.8% 4.4%
Wet/Canned Cat Food Hill's Science Diet Iams
Crude Protein 38.5% 50.5%
Crude Fat 22.0% 19.0%
Crude Fiber 4.4% 14.7%

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, Hill's Science Diet and Iams guarantee a similar amount of crude protein. For wet cat foods, Iams provides significantly more protein (about 12.06% more).


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, Iams 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. In addition, Hill's Science Diet wet cat foods also provide more fat than Iams wet foods.


Iams and Hill's Science Diet both provide roughly the same amount of crude fiber. For wet cat foods, Iams provides significantly more fiber (about 10.32% more).

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

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

Liver
Caramel
Iron Oxide
Pea Protein
Brewers Rice
Wheat Gluten
Caramel Color
Tomato Pomace
Beef By-Products
Corn Gluten Meal
Powdered Cellulose
Soybean Protein Isolate

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

Corn Flour
Pork Plasma
Poultry Fat
Animal Liver
Pork By-Products
Whole Grain Corn
Whole Grain Wheat
Dried Tomato Pomace
Pea Protein Concentrate

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

Beet Pulp
Corn Meal
Canola Oil
Corn Grits
Canola Meal
Fish Digest
Ground Corn
Vegetable Oil
Feeding Oatmeal
Poultry Giblets
Meat By-Products
Ground Yellow Corn
Chicken By-Products
Dried Meat By-Products
Chicken By-Product Meal
Ground Whole Grain Corn
Poultry By-Product Meal
Animal Fat (Preserved With Mixed Tocopherols)
Poultry 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 Iams 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 Iams.

Blue 2
Red 40
Corn Oil
Yellow 5
Yellow 6
Ethoxyquin
Added Color
Menadione Dimethylpyrimidinol Bisulfite

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

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

Iams has been recalled 2 times.

  • Aug. 14, 2013: Salmonella
  • July 30, 2010: Salmonella

Price Comparison: Which Brand Is More Expensive?

Dry Dog Food Hill's Science Diet Iams
Per Pound $1.89 $1.52
Per Calorie $0.0012 $0.0009
Dry Cat Food Hill's Science Diet Iams
Per Pound $2.81 $1.96
Per Calorie $0.0017 $0.0012
Wet Dog Food Hill's Science Diet Iams
Per Pound $3.01 $1.79
Per Calorie $0.0076 $0.0037
Wet Cat Food Hill's Science Diet Iams
Per Pound $4.11 $4.99
Per Calorie $0.0075 $0.0107

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 Iams, 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 Iams 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 Iams. 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 Pet Foods

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








Where To Buy Iams Pet Foods

You can purchase Iams pet food products from these retailers:









Type Of Pet Foods Available

Product Hill's Science Diet Iams
Dry Dog Food 32 Recipes 19 Recipes
Wet Dog Food 31 Recipes 10 Recipes
Dog Treats 15 Treats
Dry Cat Food 18 Recipes 16 Recipes
Wet Cat Food 39 Recipes 31 Recipes
Cat Treats 2 Treats

Compare Pet Food Prices Across Multiple Pet Stores

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