The Castor and Pollux Natural Ultramix Grain Free product line lists 3 dry dog foods.
Each recipe below includes its related AAFCO nutrient profile when available on the product’s official webpage: Growth, Maintenance, All Life Stages, Supplemental or Unspecified.
- Castor and Pollux Natural Ultramix Grain-Free and Poultry-Free Adult (4.5 stars) [M]
- Castor and Pollux Natural Ultramix Grain-Free Real Chicken and Sweet Potato [M]
- Castor and Pollux Natural Ultramix Grain-Free Duck, Sweet Potatoes and Whole Peas [M]
Castor and Pollux Natural Ultramix Grain-Free Duck, Sweet Potatoes and Whole Peas was selected to represent the other products in the line for this review.
Estimated Dry Matter Nutrient Content
Ingredients: Deboned duck, turkey meal, lamb meal, salmon meal (source of omega 3 fatty acids), sweet potatoes, peas, potato, duck fat (preserved with mixed tocopherols), potato protein, pea protein, natural flavor, bananas, carrots, apples, cranberries, blueberries, organic alfalfa, salmon oil, minerals (salt, zinc amino acid complex, zinc sulfate, iron amino acid complex, manganese amino acid complex, copper amino acid complex, potassium iodide, cobalt amino acid complex, sodium selenite), vitamins (choline chloride, vitamin E supplement, vitamin A supplement, vitamin B12 supplement, d-calcium pantothenate, vitamin D3 supplement, niacin, riboflavin supplement, biotin, pyridoxine hydrochloride, folic acid, thiamine mononitrate), dried chicory root, Yucca schidigera extract, dried Lactobacillus plantarum fermentation product, dried Lactobacillus casei fermentation product, dried Enterococcus faecium fermentation product, dried Lactobacillus acidophilus fermentation product, rosemary extract
Fiber (estimated dry matter content) = 3.9%
|Estimated Nutrient Content|
|Dry Matter Basis||43%||19%||30%|
|Calorie Weighted Basis||36%||39%||25%|
The first ingredient in this dog food is duck. Although it is a quality item, raw duck contains up to 73% water. After cooking, most of that moisture is lost, reducing the meat content to just a fraction of its original weight.
After processing, this item would probably account for a smaller part of the total content of the finished product.
The second ingredient is turkey meal. Turkey meal is considered a meat concentrate and contains nearly 300% more protein than fresh turkey.
The third ingredient is lamb meal, another protein-rich meat concentrate.
The fourth ingredient is salmon meal, yet another high protein meat concentrate.
Fish meal is typically obtained from the “clean, dried, ground tissue of undecomposed whole fish and fish cuttings” of commercial fish operations.1
The fifth ingredient is sweet potato. Sweet potatoes are a gluten-free source of complex carbohydrates in a dog food. They are naturally rich in dietary fiber and beta carotene.
The sixth 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.
The seventh 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 eighth ingredient is duck fat. Duck fat is obtained from rendering duck, a process similar to making soup in which the fat itself is skimmed from the surface of the liquid.
Duck fat is high in linoleic acid, an omega-6 fatty acid essential for life. Although it doesn’t sound very appetizing, duck fat is actually a quality ingredient.
The ninth ingredient is potato protein, the dry residue remaining after removing the starchy part of a potato.
The tenth ingredient is pea protein, what remains of a pea after removing the starchy part of the vegetable.
Although potato protein and pea protein contain over 80% protein, these ingredients would be expected to have a lower biological value than meat.
And less costly plant-based products like these can notably boost the total protein reported on the label — a factor that must be considered when judging the meat content of this dog food.
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 four notable exceptions…
First, we find alfalfa, a flowering member of the pea family. Although alfalfa is high in protein (18%) and fiber, it’s uncommon to see it used in a dog food. This hay-family ingredient is more commonly associated with horse feeds.
Next, salmon oil is naturally rich in the prized EPA and DHA type of omega-3 fatty acids. These two high quality fats boast the highest bio-availability to dogs and humans.
Depending on its level of freshness and purity, salmon oil should be considered a commendable addition.
In addition, chicory root is rich in inulin, a starch-like compound made up of repeating units of carbohydrates and found in certain roots and tubers.
Not only is inulin a natural source of soluble dietary fiber, it’s also a prebiotic used to promote the growth of healthy bacteria in a dog’s digestive tract.
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 Dog Food
The Bottom Line
Judging by its ingredients alone, Castor and Pollux Natural Ultramix Grain Free Dog Food looks like an above-average dry product.
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 43%, a fat level of 19% and estimated carbohydrates of about 30%.
As a group, the brand features an average protein content of 39% and a mean fat level of 18%. Together, these figures suggest a carbohydrate content of 34% for the overall product line.
And a fat-to-protein ratio of about 46%.
Above-average protein. Above-average fat. And below-average carbs when compared to a typical dry dog food.
Even when you consider the protein-boosting effect of the peas, potato protein, pea protein and alfalfa, this looks like the profile of a kibble containing a significant amount of meat.
Castor and Pollux Natural Ultramix Grain Free is a meat-based dry dog food using a significant amount of named meat meals as its main sources of animal protein, thus earning the brand 5 stars.
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.