Iams vs Purina One

Iams vs. Purina One

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

Guaranteed Analysis: Purina One vs. Iams

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.

Iams Dog Food vs. Purina One Dog Food

Dry Dog Food Iams Purina One
Crude Protein 27.4% 31.6%
Crude Fat 14.5% 16.9%
Crude Fiber 5.1% 4.3%
Wet/Canned Dog Food Iams Purina One
Crude Protein 42.0% 43.8%
Crude Fat 24.0% 27.1%
Crude Fiber 5.8% 7.1%

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.

The table shows that Iams provides far less protein than Purina One. The difference in protein content is roughly 4.13%. For wet dog foods, Purina One and Iams provide roughly the same amount of protein.


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 One typically guarantees 2.34% more fat. This is a fairly small difference between Purina One and Iams, but still worth mentioning. In addition, Purina One wet dog foods also provide more fat than Iams wet foods.


As you can see, Purina One and Iams guarantee a similar amount of crude fiber. With regards to wet dog food, Purina One and Iams also provide roughly the same amount of crude fiber.

Iams Cat Food vs. Purina One Cat Food

Dry Cat Food Iams Purina One
Crude Protein 36.1% 40.6%
Crude Fat 16.4% 14.4%
Crude Fiber 4.4% 3.8%
Wet/Canned Cat Food Iams Purina One
Crude Protein 50.5% 55.9%
Crude Fat 19.0% 13.9%
Crude Fiber 14.7% 6.9%

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.

Our analysis shows that Purina One guarantees 4.49% more protein than Iams dry cat food recipes. In addition, Purina One wet cat foods also provide more protein than Iams 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 One and Iams both provide roughly the same amount of crude fat. For wet cat foods, Iams provides more fat (about 5.04% more).


There is a relatively insignificant difference between the crude fiber content of the two brands. For wet cat foods, Iams provides more fiber (about 7.76% more).

Iams Pet Food Ingredients vs. Purina One Pet Food Ingredients

Iams and Purina One both use the following controversial ingredients in many of their products:

Liver
Canola Meal
Pea Protein
Brewers Rice
Wheat Gluten
Caramel Color
Corn Gluten Meal
Meat By-Products
Powdered Cellulose
Chicken By-Product Meal
Poultry By-Product Meal
Soybean Protein Isolate
Animal Fat (Preserved With Mixed Tocopherols)

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

Caramel
Beet Pulp
Corn Meal
Canola Oil
Corn Grits
Iron Oxide
Fish Digest
Ground Corn
Tomato Pomace
Vegetable Oil
Feeding Oatmeal
Poultry Giblets
Beef By-Products
Ground Yellow Corn
Chicken By-Products
Dried Meat By-Products
Ground Whole Grain Corn
Poultry Fat (Preserved With Mixed Tocopherols)

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

Animal Digest
Soybean Flour
Soybean Hulls
Corn Germ Meal
Whole Grain Corn
Whole Grain Wheat
Poultry By-Products
Turkey By-Product Meal
Soybean Protein Concentrate

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

Iams and Purina One both use the following harmful ingredients in many of their products:

Corn Oil
Added Color
Menadione Sodium Bisulfite Complex

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

Blue 2
Red 40
Yellow 5
Yellow 6
Ethoxyquin
Menadione Dimethylpyrimidinol Bisulfite

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

Red 3

Product Safety: Recall History of Iams & Purina One?

Iams has been recalled 2 times.

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

Purina One has been recalled once.

  • Aug. 30, 2013: Salmonella

Price Comparison: Which Brand Is More Expensive?

Dry Dog Food Iams Purina One
Per Pound $1.48 $1.39
Per Calorie $0.0009 $0.0008
Dry Cat Food Iams Purina One
Per Pound $1.81 $1.64
Per Calorie $0.0011 $0.0009
Wet Dog Food Iams Purina One
Per Pound $1.81 $1.70
Per Calorie $0.0036 $0.0034
Wet Cat Food Iams Purina One
Per Pound $4.83 $5.59
Per Calorie $0.0104 $0.0121

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 Iams or Purina One, 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 Iams or Purina One will depend on your shopping habits.

Pet owners who use our price comparison feature typically save more than 25% off retail prices for Iams and Purina One. In addition, we currently have some great coupons for our readers.


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 Iams Pet Foods

You can purchase Iams pet foods from the following stores:








Where To Buy Purina One Pet Foods

You can purchase Purina One pet food products from these retailers:









Type Of Pet Foods Available

Product Iams Purina One
Dry Dog Food 19 Recipes 13 Recipes
Wet Dog Food 10 Recipes 13 Recipes
Dog Treats
Dry Cat Food 16 Recipes 10 Recipes
Wet Cat Food 31 Recipes 12 Recipes
Cat Treats 2 Treats

Compare Pet Food Prices Across Multiple Pet Stores

Compare Iams To

Compare Purina One To

Brands Similar To