Castor and Pollux Natural Ultramix Grain-Free (Canned)

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Rating: ★★★★★

Castor and Pollux Natural Ultramix Grain Free canned dog food receives the Advisor’s top rating of 5 stars.

The Castor and Pollux Natural Ultramix Grain Free product line includes one canned dog food, a recipe claimed to meet AAFCO nutrient profiles for all life stages.

Castor and Pollux Natural Ultramix Grain Free Beef and Vegetable Dinner

Canned Dog Food

Estimated Dry Matter Nutrient Content

Protein = 44% | Fat = 22% | Carbs = 25%

Ingredients: Beef, beef broth, carrots, potatoes, peas, natural flavor, sunflower oil, calcium carbonate, sodium phosphate, guar gum, potassium chloride, choline chloride, minerals (zinc amino acid complex, iron amino acid complex, manganese amino acid complex, copper amino acid complex, potassium iodate, cobalt glucoheptonate, sodium selenite), vitamins (vitamin E supplement, vitamin B12 supplement, d-calcium pantothenate, vitamin A supplement, niacin, vitamin D3 supplement, riboflavin supplement, folic acid, pyridoxine hydrochloride, biotin, thiamine mononitrate), salt, flaxseed oil, agar-agar, locust bean gum, flaxseed, xanthan gum

Fiber (estimated dry matter content) = 7.8%

Red items indicate controversial ingredients

Estimated Nutrient Content
MethodProteinFatCarbs
Guaranteed Analysis8%4%NA
Dry Matter Basis44%22%25%
Calorie Weighted Basis36%44%21%
Protein = 36% | Fat = 44% | Carbs = 21%

The first ingredient in this dog food is beef. Beef is defined as “the clean flesh derived from slaughtered cattle” and includes skeletal muscle or the muscle tissues of the tongue, diaphragm, heart or esophagus.1

Beef is naturally rich in all ten essential amino acids required by a dog to sustain life.

The second ingredient is beef broth. Broths are of only modest nutritional value. Yet because they add both flavor and moisture to a dog food, they are a common addition component in many canned products.

The third ingredient includes carrots. Carrots are rich in beta-carotene, minerals and dietary fiber.

The fourth ingredient is potato. Potatoes can be considered a gluten-free source of digestible carbohydrates. Yet with the exception of perhaps their caloric content, potatoes are of only modest nutritional value to a dog.

The fifth ingredient includes peas. Peas are a quality source of carbohydrates. And like all legumes, they’re rich in natural fiber.

However, peas contain about 25% protein, a factor that must be considered when judging the meat content of this dog food.

After the natural flavor, we find sunflower oil. Sunflower oil is nutritionally similar to safflower oil. Since these oils are high in omega-6 fatty acids and contain no omega-3’s, they’re considered less nutritious than canola or flaxseed oils.

Sunflower oil is notable for its resistance to heat damage during cooking.

There are several different types of sunflower oil, some better than others. Without knowing more, it’s impossible to judge the quality of this ingredient.

The eighth ingredient is calcium carbonate, likely used here as a dietary mineral supplement.

From here, the list goes on to include a number of other items.

But to be realistic, ingredients located this far down the list (other than nutritional supplements) are not likely to affect the overall rating of this product.

With three notable exceptions

First, we find flaxseed oil, one of the best non-fish sources of omega-3 fatty acids — essential to a dog’s health.

Next, we note the use of flaxseed, one of the best plant sources of healthy omega-3 fatty acids. Provided they’ve first been ground into a meal, flax seeds are also rich in soluble fiber.

However, flaxseed contains about 19% protein, a factor that must be considered when judging the actual meat content of this dog food.

And lastly, this food contains chelated minerals, minerals that have been chemically attached to protein. This makes them easier to absorb. Chelated minerals are usually found in better dog foods.

Castor and Pollux Natural Ultramix
Grain Free Canned Dog Food
The Bottom Line

Judging by its ingredients alone, Castor and Pollux Natural Ultramix Grain Free looks like an above-average canned dog food.

But ingredient quality by itself cannot tell the whole story. We still need to estimate the product’s meat content before determining a final rating.

The dashboard displays a dry matter protein reading of 44%, a fat level of 22% and estimated carbohydrates of about 25%.

And a fat-to-protein ratio of about 50%.

Above-average protein. Near-average fat. And below-average carbs when compared to a typical canned dog food.

Even when you consider the protein-boosting effect of the peas and flaxseed, this looks like the profile of a wet product containing a significant amount of meat.

Bottom line?

Castor and Pollux Natural Ultramix Grain Free is a meat-based canned dog food using a significant amount of named meat as its main source of animal protein, thus earning the brand 5 stars.

Enthusiastically recommended.

Please note certain recipes are sometimes given a higher or lower rating based upon our estimate of their total meat content and (when appropriate) their fat-to-protein ratios.

Castor and Pollux Dog Food
Recall History

The following list (if present) includes all dog food recalls since 2009 directly related to this product line. If there are no recalls listed in this section, we have not yet reported any events.

You can view a complete list of all dog food recalls sorted by date. Or view the same list sorted alphabetically by brand.

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Special FDA Alert

The FDA has announced it is investigating a potential connection between grain-free diets and a type of canine heart disease known as dilated cardiomyopathy. Click here for details.

A Final Word

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Notes and Updates

11/03/2017 Last Update

  1. Association of American Feed Control Officials