Diamond Dog Food receives the Advisor’s second-lowest tier rating of 2.5 stars.
The Diamond product line includes six dry dog foods, three claimed to meet AAFCO nutrient profiles for adult maintenance and three for all life stages.
The following is a list of recipes available at the time of this review.
- Diamond Hi-Energy Formula
- Diamond Premium Adult Formula
- Diamond Puppy Formula (3 stars)
- Diamond Original Formula (2 stars)
- Diamond Maintenance Adult Formula
- Diamond Performance Formula (3 stars)
Diamond Premium Adult Formula was selected to represent the others in the line for this review.
Diamond Premium Adult Formula
Dry Dog Food
Estimated Dry Matter Nutrient Content
Ingredients: Chicken by-product meal, whole grain ground corn, wheat flour, chicken fat (preserved with mixed tocopherols), brewers rice, dried plain beet pulp, egg product, flaxseed, natural chicken flavor, fish meal, potassium chloride, salt, choline chloride, vitamin E supplement, iron proteinate, zinc proteinate, copper proteinate, ferrous sulfate, zinc sulfate, copper sulfate, potassium iodide, thiamine mononitrate, manganese proteinate, manganous oxide, ascorbic acid, vitamin A supplement, biotin, niacin, calcium pantothenate, manganese sulfate, sodium selenite, pyridoxine hydrochloride (vitamin B6), vitamin B12 supplement, riboflavin, vitamin D supplement, folic acid
Fiber (estimated dry matter content) = 3.3%
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 (real 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 item is corn. Corn is an inexpensive and controversial cereal grain of only modest nutritional value to a dog.
The third ingredient is wheat flour, a highly-refined product of wheat milling. Like corn, wheat is an inexpensive and controversial cereal grain of only modest nutritional value to a dog.
For this reason, we do not consider wheat a preferred component in any dog food.
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 includes brewers rice. Brewers rice is a cereal grain by-product consisting of the small fragments left over after milling whole rice. Aside from the caloric energy it contains, this item is of only modest nutritional value to a dog.
By the way, contrary to popular belief, brewers rice has nothing to do with the process of brewing beer.
The sixth ingredient lists 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 egg product, an unspecified (wet or dry?) 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.
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.
Following the natural chicken flavor, we find fish meal. Because it is considered a meat concentrate, fish meal contains almost 300% more protein than fresh fish itself.
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.
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, this recipe 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.
Diamond Dog Food
The Bottom Line
Judging by its ingredients alone, Diamond Dog Food appears to be an average kibble.
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 29% and an average fat level of 19%. Together, these figures suggest a carbohydrate serving size of 44% for the overall product line.
And a fat-to-protein ratio of about 65%.
Near-average protein. Above-average fat. And below-average carbs as compared to a typical dry dog food.
When you consider the protein-boosting effect of the flaxseed and the corn gluten meal found in other recipes, this looks like the profile of a kibble containing a moderate amount of meat.
Diamond Dog Food is a plant-based kibble using a moderate amount of chicken by-product or meat meals as its main sources of animal protein, thus earning the brand 2.5 stars.
Please note certain recipes are sometimes given a higher or lower rating based upon our estimate of their total meat content.
Those looking for a better quality kibble from the same company may wish to visit our review of Diamond Naturals dry dog food.
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
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Notes and Updates
01/06/2010 Original review
08/11/2010 Review updated
05/24/2012 Review updated
12/06/2013 Review updated
12/06/2013 Last Update