Diamond Naturals (Dry)


Rating: ★★★★☆

Diamond Naturals Dog Food receives the Advisor’s second-highest tier rating of 4 stars.

The Diamond Naturals product line includes 12 dry dog foods, three claimed to meet AAFCO nutrient profiles for all life stages and nine for adult maintenance.

The following is a list of recipes available at the time of this review.

  • Diamond Naturals Senior Dog
  • Diamond Naturals Lite Adult Dog (2 stars)
  • Diamond Naturals Adult Chicken and Rice
  • Diamond Naturals Extreme Athlete (4.5 stars)
  • Diamond Naturals Small Breed Puppy (4.5 stars)
  • Diamond Naturals Large Breed Puppy (3.5 stars)
  • Diamond Naturals Small Breed Adult Lamb and Rice
  • Diamond Naturals Adult Beef Meal and Rice (3.5 stars)
  • Diamond Naturals Adult Lamb Meal and Rice (3.5 stars)
  • Diamond Naturals Small Breed Adult Chicken and Rice (4.5 stars)
  • Diamond Naturals Large Breed Adult Chicken and Rice (3.5 stars)
  • Diamond Naturals Large Breed Adult Lamb Meal and Rice (3.5 stars)

Diamond Naturals Small Breed Adult Lamb and Rice was selected to represent the other products in the line for this review.

Diamond Naturals Small Breed Adult Lamb and Rice

Dry Dog Food

Estimated Dry Matter Nutrient Content

Protein = 28% | Fat = 17% | Carbs = 48%

Ingredients: Lamb, lamb meal, ground white rice, cracked pearled barley, peas, chicken fat (preserved with mixed tocopherols), dried beet pulp, egg product, fish meal, natural flavor, flaxseed, potassium chloride, salt, choline chloride, dried chicory root, l-carnitine, kale, chia seed, pumpkin, blueberries, oranges, quinoa, dried kelp, coconut, spinach, carrots, papaya, Yucca schidigera extract, dried Lactobacillus acidophilus fermentation product, dried Bifidobacterium animalis fermentation product, dried Lactobacillus reuteri fermentation product, vitamin E supplement, beta carotene, iron proteinate, zinc proteinate, copper proteinate, ferrous sulfate, zinc sulfate, copper sulfate, potassium iodide, thiamine mononitrate (vitamin B1), 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 B2), vitamin D supplement, folic acid

Fiber (estimated dry matter content) = 3.3%

Red items indicate controversial ingredients

Estimated Nutrient Content
Guaranteed Analysis25%15%NA
Dry Matter Basis28%17%48%
Calorie Weighted Basis24%35%41%
Protein = 24% | Fat = 35% | Carbs = 41%

The first ingredient in this dog food is lamb. Although it is a quality item, raw lamb contains about 80% 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 lamb meal. Lamb meal is considered a meat concentrate and contains nearly 300% more protein than fresh lamb.

The third ingredient is ground white rice, another name for rice flour. Ground rice is made from either white or brown rice and is considered a gluten-free substitute for wheat flour.

The fourth ingredient is barley. Barley is a starchy carbohydrate supplying fiber and other healthy nutrients. However, aside from its energy content, this cereal grain is of only modest nutritional value to a dog.

The fifth 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 sixth 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 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 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 ninth 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.

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 six notable exceptions

First, flaxseed is 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.

Next, 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.

In addition, we find chia seed, an edible seed nutritionally similar to flax or sesame. Provided they’re first ground into a meal, chia seeds are rich in both omega-3 fatty acids as well as dietary fiber.

However, chia seeds contain about 17% protein, a factor that must be considered when judging the meat content of this dog food.

Next, this recipe contains some quinoa. Quinoa (pronounced keen-wah) is not a true cereal grain but a plant prized for its gluten-free seeds.

Compared to most other grain-type ingredients, it is high in protein (about 12-18%), dietary fiber and other healthy nutrients.

We also note the inclusion of coconut. Depending upon the quality of the raw material, coconut is rich in medium chain fatty acids.

Medium-chain triglycerides have been shown to improve cognitive function in older dogs.2

Because of its proven safety3 as well as its potential to help in the treatment of canine cognitive dysfunction syndrome (CDS) and chronic skin disorders, MCT can be considered a positive addition to this recipe.

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.

Diamond Naturals Dog Food
The Bottom Line

Judging by its ingredients alone, Diamond Naturals 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 28%, a fat level of 17% and estimated carbohydrates of about 48%.

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 59%.

Near-average protein. Near-average fat. And near-average carbs when compared to a typical dry dog food.

When you consider the protein-boosting effect of the peas, flaxseed, chia seed and quinoa in this recipe, and the garbanzo beans, pea or potato proteins in other recipes, this looks like the profile of a kibble containing a moderate amount of meat.

Bottom line?

Diamond Naturals is a plant-based dry dog food using a moderate amount of chicken, beef or lamb meals as its main sources of animal protein, thus earning the brand 4 stars.

Highly 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.

Diamond 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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A Final Word

The descriptions and analyses expressed in this and every article on this website represent the views and opinions of the author.

The Dog Food Advisor does not test dog food products.

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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

10/08/2015 Last Update

  1. Association of American Feed Control Officials
  2. Pan Y et al, Dietary supplementation with medium-chain TAG has long-lasting cognition-enhancing effects in aged dogs, British Journal of Nutrition, Volume 103, Issue 12, June 2010, pp 1746-1754
  3. Matulka RA et al, Lack of toxicity by medium chain triglycerides (MCT) in canines during a 90-day feeding study,Food Chem Toxicol, Jan 2009, 47(1) 35-9.