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Iams vs Castor & Pollux

Iams vs. Castor & Pollux

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

Guaranteed Analysis: Castor & Pollux 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. Castor & Pollux Dog Food

Dry Dog Food Iams Castor & Pollux
Crude Protein 27.8% 33.1%
Crude Fat 15.1% 16.9%
Crude Fiber 5.1% 4.1%
Wet/Canned Dog Food Iams Castor & Pollux
Crude Protein 42.7% 39.9%
Crude Fat 23.1% 23.5%
Crude Fiber 6.0% 6.5%

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.

Iams dry recipes contain 5.24% less protein than Castor & Pollux dry recipes. This difference in protein content is a notable difference between Castor & Pollux and Iams. For wet dog foods, Iams typically provides a little more protein (about 2.85% more).


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, Castor & Pollux and Iams also provide roughly the same amount of crude fat.


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

Iams Cat Food vs. Castor & Pollux Cat Food

Dry Cat Food Iams Castor & Pollux
Crude Protein 36.0% 38.2%
Crude Fat 16.8% 15.7%
Crude Fiber 4.3% 4.0%
Wet/Canned Cat Food Iams Castor & Pollux
Crude Protein 50.6% 43.3%
Crude Fat 19.2% 20.4%
Crude Fiber 13.2% 5.7%

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, Iams typically provides less protein than Castor & Pollux. However, this difference is relatively small and doesn't represent a significant difference between the two brands. In addition, Iams wet cat foods also provide more protein than Castor & Pollux 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

Castor & Pollux and Iams both provide roughly the same amount of crude fat. With regards to wet cat food, Castor & Pollux and Iams also provide roughly the same amount of crude fat.


There is a relatively insignificant difference between the crude fiber content of the two brands. For wet cat foods, Iams provides more fiber (about 7.45% more).

Iams Pet Food Ingredients vs. Castor & Pollux Pet Food Ingredients

Iams and Castor & Pollux both use the following controversial ingredients in many of their products:

Caramel
Pea Protein
Powdered Cellulose

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

Liver
Beet Pulp
Corn Meal
Canola Oil
Corn Grits
Iron Oxide
Canola Meal
Fish Digest
Ground Corn
Brewers Rice
Wheat Gluten
Caramel Color
Vegetable Oil
Feeding Oatmeal
Poultry Giblets
Beef By-Products
Corn Gluten Meal
Meat By-Products
Ground Yellow Corn
Chicken By-Products
Dried Tomato Pomace
Dried Meat By-Products
Chicken By-Product Meal
Ground Whole Grain Corn
Poultry By-Product Meal
Soybean Protein Isolate
Animal Fat (Preserved With Mixed Tocopherols)
Poultry Fat (Preserved With Mixed Tocopherols)

Here are some of the controversial ingredients used only by Castor & Pollux.

Garlic
Garlic Powder
Tomato Pomace
Organic Pea Protein
Organic Caramel Color
Organic Garlic Powder
Pea Protein Concentrate
Canola Oil (Preserved With Mixed Tocopherols)
Canola Oil (Preserved With Mixed Tocopherols And Citric Acid)

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

Iams and Castor & Pollux 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 Iams & Castor & Pollux?

Iams has been recalled 2 times.

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

Castor & Pollux has been recalled once.

  • May 23, 2018: elevated levels of beef thyroid hormone

Price Comparison: Which Brand Is More Expensive?

Dry Dog Food Iams Castor & Pollux
Per Pound $1.51 $4.96
Per Calorie $0.0009 $0.0030
Dry Cat Food Iams Castor & Pollux
Per Pound $2.25 $4.92
Per Calorie $0.0013 $0.0030
Wet Dog Food Iams Castor & Pollux
Per Pound $2.59 $5.78
Per Calorie $0.0055 $0.0122
Wet Cat Food Iams Castor & Pollux
Per Pound $8.13 $8.07
Per Calorie $0.0181 $0.0170

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 Castor & Pollux, 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 Castor & Pollux 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 Castor & Pollux. 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:


33 Recipes In-Stock Today

19 Recipes In-Stock Today

24 Recipes In-Stock Today

Where To Buy Castor & Pollux Pet Foods

You can purchase Castor & Pollux pet food products from these retailers:


58 Recipes In-Stock Today

25 Recipes In-Stock Today

51 Recipes In-Stock Today

Type Of Pet Foods Available

Product Iams Castor & Pollux
Dry Dog Food 29 Recipes 14 Recipes
Wet Dog Food 10 Recipes 28 Recipes
Dog Treats 22 Treats
Dry Cat Food 12 Recipes 6 Recipes
Wet Cat Food 37 Recipes 18 Recipes
Cat Treats 2 Treats 1 Treats

Compare Pet Food Prices Across Multiple Pet Stores