Rex Dog Food (Dry)

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Rating: ★½☆☆☆

Rex Dog Food receives the Advisor’s lowest-tier rating of 1.5 stars.

The Rex product line includes 7 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.

Important: Because many websites do not reliably specify which Growth or All Life Stages recipes are safe for large breed puppies, we do not include that data in this report. Be sure to check actual packaging for that information.

  • Rex Puppy [A]
  • Rex Premium [A]
  • Rex High Protein [A]
  • Rex Maintenance [A]
  • Rex Plus (2.5 stars) [A]
  • Rex Golden Nugget [A]
  • Rex Golden Chunk (2 stars) [A]

Rex Premium was selected to represent the other products in the line for this review.

Rex Premium

Dry Dog Food

Estimated Dry Matter Nutrient Content

Protein = 30% | Fat = 17% | Carbs = 45%

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 indicate controversial ingredients

Estimated Nutrient Content
MethodProteinFatCarbs
Guaranteed Analysis27%15%NA
Dry Matter Basis30%17%45%
Calorie Weighted Basis26%35%39%
Protein = 26% | Fat = 35% | Carbs = 39%

The first ingredient in this dog food includes 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 pork meal. Pork meal is considered a meat concentrate and contains nearly 300% more protein than fresh pork. Yet it can also be high in ash — about 25-30%.

However, the ash content of the final product is typically adjusted in the recipe to allow its mineral profile to meet AAFCO guidelines.

The third ingredient is chicken by-product meal, a dry rendered product of slaughterhouse waste. It’s made from what’s left of a slaughtered chicken after all the prime cuts have been removed.

In addition to organs (the nourishing part), this stuff can contain almost anything — feet, beaks, undeveloped eggs — anything except feathers.

On the brighter side, by-product meals are meat concentrates and contain nearly 300% more protein than fresh chicken.

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 ingredient is corn gluten meal. Gluten is the rubbery residue remaining once corn has had most of its starchy carbohydrate washed out of it.

Although corn gluten meal contains 60% protein, this ingredient would be expected to have a lower biological value than meat.

And less costly plant-based products like this can notably 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 fifth ingredient is chicken fat. Chicken fat is obtained from rendering chicken, a process similar to making soup in which the fat itself is skimmed from the surface of the liquid.

Chicken fat is high in linoleic acid, an omega-6 fatty acid essential for life. Although it doesn’t sound very appetizing, chicken fat is actually a quality ingredient.

The sixth 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).

The seventh 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 eighth 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.

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 the accumulation of hemoglobin pigment in the liver and elevated hepatic enzymes in the blood.

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.

The dashboard displays a dry matter protein reading of 30%, a fat level of 17% and estimated carbohydrates of about 45%.

As a group, the brand features an average protein content of 27% and a mean fat level of 14%. Together, these figures suggest a carbohydrate content of 51% for the overall product line.

And a fat-to-protein ratio of about 52%.

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 and flaxseed in this recipe, and soybean meal contained in another recipe, this looks like the profile of a kibble containing a moderate amount of meat.

Bottom line?

Rex is a plant-based dry dog food using a moderate amount of named and unnamed meat and by-product meals as its main sources of animal protein, thus earning the brand 1.5 stars.

Not 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.

Rex 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.

To learn why our ratings have nothing to do with a product’s recall history, please visit our Dog Food Recalls FAQ page.

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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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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

11/04/2017 Last Update