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Diamond vs Purina One

Diamond vs. Purina One

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

Guaranteed Analysis: Purina One vs. Diamond

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.

Diamond Dog Food vs. Purina One Dog Food

Dry Dog Food Diamond Purina One
Crude Protein 27.6% 32.0%
Crude Fat 16.7% 17.4%
Crude Fiber 4.5% 4.5%
Wet/Canned Dog Food Diamond Purina One
Crude Protein 43.9% 45.6%
Crude Fat 25.8% 26.0%
Crude Fiber 4.5% 7.1%

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.

Diamond dry recipes contain 4.38% less protein than Purina One dry recipes. This difference in protein content is a notable difference between Purina One and Diamond. For wet dog foods, Purina One and Diamond provide roughly the same amount of protein.


Crude Fat Comparison For Dog Food

Dietary fats serves a multitude of roles in the proper development and function of our canine companions. Here are some of the benefits (not exhaustive):

  • Help produce prostaglandins, which reduce inflammation among other critical functions.
  • Aid in the absorption of fat-soluble vitamins
  • Improve skin and coat health
  • Improve the palatially of your dog's food

Both brands provide roughly the same amount of crude fat. With regards to wet dog food, Purina One and Diamond also provide roughly the same amount of crude fat.


As you can see, Diamond and Purina One guarantee a similar amount of crude fiber. For wet dog foods, Purina One typically provides a little more fiber (about 2.59% more).

Diamond Cat Food vs. Purina One Cat Food

Dry Cat Food Diamond Purina One
Crude Protein 36.7% 40.6%
Crude Fat 17.6% 15.1%
Crude Fiber 5.2% 3.8%
Wet/Canned Cat Food Diamond Purina One
Crude Protein 44.7% 52.9%
Crude Fat 22.0% 17.0%
Crude Fiber 6.1% 7.2%

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.

According to our average data, Diamond typically provides less protein than Purina One. However, this difference is relatively small and doesn't represent a significant difference between the two brands. In addition, Purina One wet cat foods also provide more protein than Diamond 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):

  • Aid in the digestion and absorption of fat-soluble vitamins
  • Improve the health of skin/coat
  • Slow the growth of yeast infections
  • Slow the development and spread of certain type of cancers.
  • Maintain healthy blood pressure

If you look at the average percentages of crude fat, you'll notice that Diamond typically guarantees 2.51% more fat. This is a fairly small difference between Diamond and Purina One, but still worth mentioning. In addition, Diamond wet cat foods also provide more fat than Purina One wet foods.


Purina One and Diamond both provide roughly the same amount of crude fiber. With regards to wet cat food, Purina One and Diamond also provide roughly the same amount of crude fiber.

Diamond Pet Food Ingredients vs. Purina One Pet Food Ingredients

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

Brewers Rice
Corn Gluten Meal
Powdered Cellulose
Chicken By-Product Meal
Poultry By-Product Meal

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

Meat Meal
White Rice
Ground Corn
Tomato Pomace
Beef By-Products
Ground Whole Grain Corn
Canola Oil (Preserved With Mixed Tocopherols)

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

Liver
Canola Meal
Pea Protein
Wheat Gluten
Animal Digest
Caramel Color
Soybean Flour
Soybean Hulls
Corn Germ Meal
Meat By-Products
Whole Grain Corn
Whole Grain Wheat
Ground Yellow Corn
Poultry By-Products
Turkey By-Product Meal
Soybean Protein Isolate
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.

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

Menadione Sodium Bisulfite

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

Red 3
Corn Oil
Added Color
Menadione Sodium Bisulfate Complex
Menadione Sodium Bisulfite Complex

Product Safety: Recall History of Diamond & Purina One?

Diamond has been recalled once.

  • March 10, 2013: low level of thiamine (Vitamin B1)

Purina One has been recalled once.

  • Aug. 30, 2013: Salmonella

Price Comparison: Which Brand Is More Expensive?

Dry Dog Food Diamond Purina One
Per Pound $1.40 $1.68
Per Calorie $0.0009 $0.0010
Dry Cat Food Diamond Purina One
Per Pound $1.89 $1.94
Per Calorie $0.0012 $0.0011
Wet Dog Food Diamond Purina One
Per Pound $2.41 $1.85
Per Calorie $0.0041 $0.0038
Wet Cat Food Diamond Purina One
Per Pound $3.43 $4.84
Per Calorie $0.0070 $0.0110

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 Diamond 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 Diamond 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 Diamond 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 Diamond Pet Foods

You can purchase Diamond pet foods from the following stores:


32 Recipes In-Stock Today

34 Recipes In-Stock Today

35 Recipes In-Stock Today

Where To Buy Purina One Pet Foods

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


52 Recipes In-Stock Today

28 Recipes In-Stock Today

42 Recipes In-Stock Today

Type Of Pet Foods Available

Product Diamond Purina One
Dry Dog Food 27 Recipes 19 Recipes
Wet Dog Food 3 Recipes 17 Recipes
Dog Treats 6 Treats 4 Treats
Dry Cat Food 6 Recipes 12 Recipes
Wet Cat Food 3 Recipes 16 Recipes
Cat Treats

Compare Pet Food Prices Across Multiple Pet Stores