Rex Dog Food receives the Advisor’s lowest-tier rating of 1 star.
The Rex Dog Food product line includes three kibbles. However, since we’re unable to locate AAFCO nutritional adequacy statements for these dog foods on the company’s website, it’s impossible for us to report specific life stage recommendations for these recipes.
The following is a list of recipes available at the time of this review.
- Rex Puppy
- Rex Premium
- Rex Golden Nugget
Rex Premium was selected to represent the other products in the line for this review.
Dry Dog Food
Estimated Dry Matter Nutrient Content
Ingredients: Cereal food fines, meat meal, chicken by-product meal, animal fat, corn gluten meal, beet pulp, ground flax seed, bentonite, vitamin A supplement, vitamin D3 supplement, vitamin E supplement, vitamin B12 supplement, niacin, riboflavin supplement, D calcium pantothenate, choline chloride, folic acid, thiamine mononitrate, pyridoxine hydrochloride, ferrous sulfate, copper sulfate, manganous oxide, zinc oxide, ethylenediamine dihydroiodide, calcium carbonate and ethoxyquin (a preservative)
Fiber (estimated dry matter content) = 3.9%
Red items when present indicate controversial ingredients
|Estimated Nutrient Content|
|Dry Matter Basis||30%||17%||45%|
|Calorie Weighted Basis||26%||35%||39%|
The first ingredient in this dog food is cereal food fines. Cereal food fines are an inexpensive by-product of cereal grain processing.
This waste ingredient can possibly contain a measurable amount of sugar left over from the manufacture of breakfast cereals. Food fines are typically associated with lower quality dog foods.
The second ingredient is meat meal, “the rendered product from mammal tissues, exclusive of blood, hair, hoof, horn, hide trimmings, manure, stomach and rumen contents except in such amounts as may occur unavoidably in good processing practices”.1
Since in this case the source animal is not known, this item could come from almost anywhere: spoiled supermarket meat, roadkill, dead, diseased or dying livestock — even euthanized pets.
On the brighter side, however, meat meals are meat concentrates and contain nearly 300% more protein than fresh meat.
Although this item does contain all the amino acids a dog needs, we do not consider meat meal a quality component.
The third ingredient includes chicken by-product meal, another protein-rich meat concentrate.
In addition to organs (the nourishing part), this stuff can contain almost anything — feet, beaks, undeveloped eggs — anything except quality skeletal muscle (real meat).
In any case, although this item contains all the amino acids a dog needs, we consider chicken by-products an inexpensive, lower quality ingredient.
The fourth item is animal fat. Animal fat is a generic by-product of rendering, the same high-temperature process used to make meat meals.
Since there’s no mention of a specific animal, this item could come from almost anywhere: roadkill, spoiled supermarket meat, dead, diseased or dying cattle — even euthanized livestock.
For this reason, we do not consider generic animal fat a quality ingredient.
The fifth ingredient is corn gluten meal. Gluten is the rubbery residue remaining once corn has had most of its starchy carbohydrate washed out of it.
Compared to meat, glutens are inferior grain-based proteins lower in some of the essential amino acids dogs need for life.
This inexpensive plant-based ingredient can significantly boost the total protein reported on the label — a factor that must be considered when judging the actual meat content of this dog food.
The sixth ingredient is beet pulp. Beet pulp is a controversial ingredient, a high fiber by-product of sugar beet processing.
Some denounce beet pulp as an inexpensive filler while others cite its outstanding intestinal health and blood sugar benefits.
We only call your attention here to the controversy and believe the inclusion of beet pulp in reasonable amounts in most dog foods is entirely acceptable.
The seventh ingredient is 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.
The eighth ingredient is bentonite, a naturally occurring clay-like compound rich in many trace minerals. Reported benefits include the binding of certain mold-based toxins and even controlling diarrhea and irritable bowel syndrome (IBS).
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 no mention of probiotics, friendly bacteria applied to the surface of the kibble after processing to help with digestion.
Next, the minerals listed here do not appear to be chelated. And that can make them more difficult to absorb. Non-chelated minerals are usually associated with lower quality dog foods.
And lastly, this dog food contains ethoxyquin, a controversial preservative linked to birth defects, stillborn puppies, liver failure, infertility and cancer.
Rex Dog Food
The Bottom Line
Judging by its ingredients alone, Rex Dog Food looks like a below 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.
As a group, the brand features an average protein content of 28% and a mean fat level of 13%. Together, these figures suggest a carbohydrate content of 52% for the overall product line.
And a fat-to-protein ratio of about 45%.
Near-average protein. Below-average fat. And above-average carbs when compared to a typical dry dog food.
When you consider the protein-boosting effects of the corn gluten meal, flaxseed and soybean meal contained in another recipe, this looks like the profile of a kibble containing a below average amount of meat.
Rex Dog Food is a plant-based dry kibble using a below average amount of meat and by-product meals as its main sources of animal protein, thus earning the brand 1 star.
Please note certain recipes are sometimes given a higher or lower rating based upon our estimate of their total meat content.
A Final Word
The descriptions and analyses expressed in this and every article on this website represent the views and opinions of the author.
We rely almost entirely on the integrity of the information posted by each company on its website. As such, the accuracy of every report is directly dependent upon the quality of that data.
Although it's our goal to ensure all the information on this website is correct, we cannot guarantee its completeness or its accuracy; nor can we commit to ensuring all the material is kept up-to-date on a daily basis.
Each review is offered in good faith and has been designed to help you make a more informed decision when buying dog food.
However, due to the biological uniqueness of every animal, none of our ratings are intended to suggest feeding a particular product will result in a specific dietary response or health benefit for your pet.
For a better understanding of how we analyze each product, please read our article, "The Problem with Dog Food Reviews".
Remember, no dog food can possibly be appropriate for every life stage, lifestyle or health condition. So, choose wisely. And when in doubt, consult a qualified veterinary professional for help.
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Notes and Updates
10/28/2011 Original review
05/07/2013 Review updated
05/07/2013 Last Update
- Association of American Feed Control Officials ↩