Prism Dog Food receives the Advisor’s mid-tier rating of 3.5 stars.
The Prism product line includes six dry dog foods. However, since we’re unable to locate AAFCO nutritional adequacy statements for these dog foods on the product’s web page, 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.
- Prism Adult 26/18
- Prism Growth 28/18
- Prism Performance 30/20
- Prism Maintenance 21/12 (2.5 stars)
- Prism Lamb Meal and Rice 22/12 (3 stars)
- Prism Chicken Meal, Lamb Meal and Rice 24/14 (4 stars)
Prism Adult 26/18 was selected to represent the other products in the line for this review.
Prism Adult 26/18
Dry Dog Food
Estimated Dry Matter Nutrient Content
Ingredients: Chicken by-product meal, ground yellow corn, ground brown rice, chicken fat (preserved with natural mixed tocopherols), pork meal, dried beet pulp, fish meal, brewers dried yeast, flaxseed, dried egg product, salt, potassium chloride, and vitamin-mineral fortified
Fiber (estimated dry matter content) = 3.9%
Red items when present indicate controversial ingredients
|Estimated Nutrient Content|
|Dry Matter Basis||29%||20%||43%|
|Calorie Weighted Basis||24%||40%||36%|
The first ingredient in this dog food 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 quality skeletal muscle (conventional meat).
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 second ingredient is corn. Corn is an inexpensive and controversial cereal grain. And aside from its energy content, this grain is of only modest nutritional value to a dog.
For this reason, we do not consider corn a preferred component in any dog food.
The third ingredient is brown rice, a complex carbohydrate that (once cooked) can be fairly easy to digest. However, aside from its natural energy content, rice is of only modest nutritional value to a dog.
The fourth 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 fifth 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 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 fish meal, another protein-rich 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
Unfortunately, this particular item is anonymous. Because various fish contain different types of fats, we would have preferred to have known the source species.
What’s more, the controversial chemical ethoxyquin is frequently used as a preservative in fish meals.
But because it’s usually added to the raw fish before processing, the chemical does not have to be reported to consumers.
We find no public assurances from the company this product is ethoxyquin-free.
Without knowing more, we would expect to find at least a trace of ethoxyquin in this product.
The eighth ingredient is brewers yeast can be a controversial item. Although it’s a by-product of the beer making process, this ingredient is rich in minerals and other healthy nutrients.
Fans believe yeast repels fleas and supports the immune system.
Critics argue yeast ingredients can be linked to allergies. This may be true, but (like all allergies) only if your particular dog is allergic to the yeast itself.
In addition, a vocal minority insists yeast can increase the risk of developing the life-threatening condition known as bloat. However, this is a claim we’ve not been able to scientifically verify.
In any case, unless your dog is specifically allergic to it, yeast can still be considered a nutritious additive.
What’s more noteworthy here is that brewers yeast contains about 48% protein, a factor that must be considered when judging the actual meat content of this dog food.
The ninth 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 next ingredient is dried egg product, a dehydrated form of shell-free eggs. Quality can vary significantly. Lower grade egg product can even come from commercial hatcheries — from eggs that have failed to hatch.
In any case, eggs are easy to digest and have an exceptionally high biological value.
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 two notable exceptions…
First, we find no mention of probiotics, friendly bacteria applied to the surface of the kibble after processing to help with digestion.
And lastly, the vitamins and minerals added to this product are not detailed sufficiently here to permit us to judge their quality.
Prism Dog Food
The Bottom Line
Judging by its ingredients alone, Prism looks like an average dry 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.
As a group, the brand features an average protein content of 28% and a mean fat level of 17%. Together, these figures suggest a carbohydrate content of 47% for the overall product line.
And a fat-to-protein ratio of about 62%.
Near-average protein. Near-average fat. And near-average carbs when compared to a typical dry dog food.
Even when you consider the protein-boosting effect of the brewers yeast and flaxseed in this recipe, and the corn gluten meal contain in another recipe, this looks like the profile of a kibble containing a moderate amount of meat.
Prism Dog Food is a plant-based kibble using a moderate amount of chicken, lamb or chicken by-product meals as its main sources of animal protein, thus earning the brand 3.5 stars.
Please note certain recipes are sometimes given a higher or lower rating based upon our estimate of their total meat content.
Rice ingredients can sometimes contain arsenic. Until the US FDA establishes safe upper levels for arsenic content, pet owners may wish to limit the total amount of rice fed in a dog's daily diet.
A Final Word
The descriptions and analyses expressed in this and every article on this website represent the views and opinions of the author.
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However, our rating system is not intended to suggest feeding a particular product will result in specific health benefits for your pet.
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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
09/22/2010 Original review
06/19/2012 Review updated
01/06/2014 Review updated
01/06/2014 Last Update
- Association of American Feed Control Officials ↩