Purina One SmartBlend Dog Food gets the Advisor’s second-lowest tier rating of 2 stars.
The Purina One SmartBlend product line includes nine dry dog foods, two claimed to meet AAFCO nutrient profiles for growth, four for adult maintenance and three for all life stages.
The following is a list of recipes available at the time of this review.
- Purina One SmartBlend Large Breed Adult
- Purina One SmartBlend Sensitive Systems
- Purina One SmartBlend Large Breed Puppy
- Purina One SmartBlend Healthy Puppy Formula
- Purina One SmartBlend Lamb and Rice Formula
- Purina One SmartBlend Healthy Weight Formula
- Purina One SmartBlend Chicken and Rice Formula
- Purina One SmartBlend Small Bites Beef and Rice Formula
- Purina One SmartBlend Vibrant Maturity 7 Plus Senior Formula
Purina One SmartBlend Small Bites Beef and Rice Formula was selected to represent the other products in the line for this review.
Purina One SmartBlend Small Bites Beef and Rice
Dry Dog Food
Estimated Dry Matter Nutrient Content
Ingredients: Beef (natural source of glucosamine), brewers rice, corn gluten meal, whole grain corn, poultry by-product meal (natural source of glucosamine), animal fat preserved with mixed-tocopherols (form of vitamin E), oatmeal, whole grain wheat, soy flakes, soybean meal, animal digest, glycerin, calcium phosphate, calcium carbonate, salt, potassium chloride, caramel color, vitamin E supplement, choline chloride, zinc sulfate, l-lysine monohydrochloride, ferrous sulfate, sulfur, manganese sulfate, niacin, vitamin A supplement, calcium pantothenate, thiamine mononitrate, copper sulfate, riboflavin supplement, vitamin B12 supplement, pyridoxine hydrochloride, garlic oil, folic acid, vitamin D3 supplement, calcium iodate, biotin, menadione sodium bisulfite complex (source of vitamin K activity), sodium selenite
Fiber (estimated dry matter content) = 3.4%
Red items when present indicate controversial ingredients
|Estimated Nutrient Content|
|Dry Matter Basis||30%||18%||44%|
|Calorie Weighted Basis||25%||38%||38%|
The first ingredient in this dog food is beef. Although it’s a quality item, raw beef 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 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.
The third 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 fourth 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 fifth ingredient is poultry by-product meal, a dry rendered product of slaughterhouse waste. It’s made from what’s left of slaughtered poultry 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).
We consider poultry by-products slightly lower in quality than a single-species ingredient (like chicken by-products).
On the brighter side, by-product meals are meat concentrates and contain nearly 300% more protein than fresh poultry.
The sixth ingredient includes 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 seventh ingredient is oatmeal, a whole-grain product made from coarsely ground oats. Oatmeal is naturally rich in B-vitamins, dietary fiber and can be (depending upon its level of purity) gluten-free.
The eighth ingredient is wheat. Wheat is another cereal grain and subject to the same issues as corn (previously discussed).
The ninth ingredient is soy flakes. Soy flakes are derived from whole soybeans and contain about 55% protein, a factor that must be considered when attempting to judge the actual meat content of a pet food recipe.
The next ingredient is soybean meal, a by-product of soybean oil production more commonly found in farm animal feeds.
Although soybean meal contains 48% 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.
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, animal digest is a chemically hydrolyzed mixture of animal by-products that is usually sprayed onto the surface of a dry kibble to improve its taste.
Next, we’re always disappointed to find artificial coloring in any pet food. That’s because coloring is used to make the product more appealing to humans — not your dog. After all, do you really think your dog cares what color his kibble is?
In addition, garlic oil may be a controversial item. We say “may be” here because we are not certain of the oil’s chemical relationship to raw garlic itself.
Although most experts favor the ingredient for its numerous health benefits, garlic (in rare cases) has been linked to Heinz body anemia in dogs.1
However, the limited professional literature we surveyed provided no definitive warnings regarding the use of garlic — especially when used in small amounts (as it likely is here).
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.
In addition, we find no mention of probiotics, friendly bacteria applied to the surface of the kibble after processing to help with digestion.
And lastly, this dog food contains menadione, a controversial form of vitamin K linked to liver toxicity, allergies and the abnormal break-down of red blood cells.
Since vitamin K isn’t required by AAFCO in either of its dog food nutrient profiles, we question the use of this substance in any canine formulation.
Purina One SmartBlend Dog Food
The Bottom Line
Judging by its ingredients alone, Purina One SmartBlend 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 30% and a mean fat level of 16%. Together, these figures suggest a carbohydrate content of 46% for the overall product line.
And a fat-to-protein ratio of about 54%.
Near-average protein. Near-average fat. And below-average carbs when compared to a typical dry dog food.
When you consider the protein-boosting effects of the corn gluten meal, soy flakes, soybean meal, and also soy and corn germ meals included in some recipes, this looks like the profile of a kibble containing a below-average amount of meat.
Purina One SmartBlend dry dog food is a plant-based kibble using a below-average amount of beef, lamb, poultry or salmon as its main sources of animal protein, thus earning the brand 2 stars.
Please note some products may have been given higher or lower ratings 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
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Notes and Updates
09/09/2011 Original review
03/17/2013 Review updated
03/17/2013 Last Update
- Yamato et al, Heinz Body hemolytic anemia with eccentrocytosis from ingestion of Chinese chive (Allium tuberosum) and garlic (Allium sativum) in a dog, Journal of the American Animal Hospital Association 41:68-73 (2005) ↩