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Ingredient file // Fruit or vegetable

Spinach

Real greens, little reason to choose the bag

Spinach is a leafy vegetable added fresh or dried to dog food. It contributes some nutrients and fiber, but its place on the ingredient list does not tell you how much it supplies. Dog studies have not isolated a health benefit from spinach.

Spinach
What it is
Edible spinach leaves used fresh or dried and ground for inclusion in dog food.
Made from
Harvested spinach leaves
Main job
Small vegetable addition
Typical amount
One published dog diet used 1% dried flakes
Watch for
Dogs with calcium oxalate stones
Not the same as
Spinach extract

Our read // In our catalog

In 1 of every 8 foods we track

Share of foods that list it

13%

297 of the 2,250 foods we track, from 34 brands. 194 dry dog food, 42 wet dog food, 39 frozen dog food.

Each square is 1% of the catalog

Where it sits on the label

Median position 19. In the top five of 6 foods, so it is usually a minor ingredient.

Top five List position, heaviest first

Above the salt

47%

Usually listed after the salt, which caps it at roughly 1% of the recipe in 53% of foods.

Price per lb

Foods with it $4.09
All foods $3.24

Median of the cheapest bag price across 186 priced foods, 26% above the catalog. The price is the food's, not the ingredient's.

Who leans on it

19%

of the foods that list it are from Wellness. 34 brands use it in total.

What it is

How it is made

Spinach is harvested as a vegetable crop. To make a dry ingredient, processors sort and wash the leaves, then remove water and grind them into powder that is easier to measure into a recipe.6

  1. 01 // Source Spinach leaves Harvested leaves supply the raw vegetable; a published powder study began with fresh leaves.
  2. 02 // Process Sorted and washed Leaves are graded and cleaned to remove dirt before drying.
  3. 03 // Process Dried and ground A cabinet dryer removes moisture, and a grinder turns the leaves into powder.
  4. 04 // Output Spinach powder The dry powder is weighed into a recipe without handling bulky fresh leaves.

What is in it

Composition, dry matter

36-38

% protein

Measured across 2 spinach varieties. This is the concentration in dry leaves, not evidence that a small addition supplies meaningful protein to a dog.

Protein 35.8-38.1%5
Carbohydrates 34.2-37.8%5
Ash 18.6-21.4%5
Fat 6.2-7.8%5

These are dry matter averages for 2 cultivated varieties, not specifications for every spinach powder. Variety and growing conditions changed the measured mix, and a separate dried-powder assay differed substantially.5,6

Why it is in the bag

What the manufacturer gets

  1. 01

    Adds leaf nutrients

    Spinach contributes protein, minerals and fiber. Its contribution to the finished food depends on how much is added; the ingredient list does not disclose that amount.5,6,8

  2. 02

    Adds vegetable color

    Spinach powder changed the color of baked foods in a published test. It gives a recipe a recognizable green ingredient, but color says nothing about a dog's health.6

  3. 03

    Stores as a dry ingredient

    Drying and grinding make fresh leaves easier to store and measure. That processing adds work; the published dog formula used spinach at a small amount, not as a bulk protein source.4,6

How much A published antioxidant diet for older Beagles contained 1% spinach flakes alongside other vegetables and nutrients; it did not test spinach alone.1,4

Our read // The claims

What the evidence supports

Strong: controlled studies in dogs agree. Some: small or mixed dog data. Thin: mechanism or lab work only. None: nothing, or the evidence points the other way.

  1. Brands say

    Spinach adds fiber and iron

    Evidence

    1. Strong
    2. Some
    3. Thin
    4. None

    A tested dried powder contained 8.19% fiber and 40.36 mg iron per 100 g as sold. Those measurements show what the ingredient carries. They do not show how much a dog gets from an undisclosed recipe amount.6,8

  2. Brands say

    Spinach boosts older dogs' immunity

    Outruns the evidence

    Evidence

    1. Strong
    2. Some
    3. Thin
    4. None

    A 21-dog trial found an immune-cell change when an antioxidant diet was paired with behavioral enrichment. The food contained 1% spinach flakes among many additions. The trial did not show that spinach alone improves immunity.1,4

  3. Brands say

    Spinach lutein protects dogs' eyesight

    Outruns the evidence

    Evidence

    1. Strong
    2. Some
    3. Thin
    4. None

    In a 12-dog trial, a supplement containing lutein and other antioxidants improved some retinal measurements. The dogs received a supplement rather than spinach, so the result cannot show that spinach in food protects vision.2

  4. Owners say

    Spinach lowers dogs' bladder cancer risk

    Outruns the evidence

    Evidence

    1. Strong
    2. Some
    3. Thin
    4. None

    A case-control study compared 92 Scottish Terriers with bladder cancer against 83 controls and found an association for green leafy vegetables as a group. It did not isolate spinach or show that eating it prevents cancer.3

  5. Critics say

    Spinach is just filler

    Outruns the evidence

    Evidence

    1. Strong
    2. Some
    3. Thin
    4. None

    Dried spinach has measured nutrients and fiber. A published dog diet used 1% spinach flakes, a small addition within a mixed formula. Its limited amount does not make the leaf empty, and the study found no spinach-specific benefit.4,5,6

Straight answers

What owners ask

  1. Q01

    Is it just filler?

    No

    Spinach has measurable nutrients and fiber. At the small amount used in a published dog diet, its contribution is limited. A spinach listing is a poor reason to choose one complete food over another.4,5,6

  2. Q02

    Is spinach toxic to dogs?

    No

    Spinach leaves have been used in published dog diets. Their oxalate content matters for dogs with calcium oxalate stones; it does not make a small spinach addition poisonous to every dog.4,7

  3. Q03

    Does it replace vitamin supplements?

    No

    A complete food must meet nutrient requirements for its stated life stage. The ingredient list names spinach but gives neither its amount nor the nutrients it delivers in the finished food.8

  4. Q04

    Does fresh spinach beat dried?

    No proof

    Fresh leaves carry water, while drying makes spinach easier to measure into a recipe. The label does not reveal how much spinach remains in the finished food, and no cited dog trial compares the two forms.6,8

Who uses it

Brands, best sellers and the company it keeps

Top brands, by foods that list it

  1. Wellness 56
  2. Stella & Chewy's 50
  3. Instinct 28
  4. Health Extension 20
  5. Earthborn Holistic 15
  6. Open Farm 14
  7. Diamond 14
  8. Lotus 14
  9. Abound 12
  10. Blue 8

Plus 24 more brands.

Amazon best sellers that list it

  1. #10 Diamond Naturals Skin & Coat Formula All Life Stages Salmon & Potato Formula Dry Dog Food
  2. #40 Stella & Chewy’s Marie’s Magical Dinner Dust Grass-Fed Beef Recipe Freeze-Dried Raw Dog Food Topper
  3. #53 Orijen Original Dry Dog Food
  4. #54 Wellness Complete Health Deboned Chicken & Oatmeal Dry Dog Food
  5. #68 Wellness Complete Health Small Breed Turkey & Oatmeal Dry Dog Food
  6. #70 Iams Adult Small Breed Dry Dog Food
  7. #73 Diamond Naturals Large Breed Puppy Lamb & Rice Formula Dry Dog Food
  8. #77 Iams Adult Healthy Weight Dry Dog Food

Rank on Amazon's dog food best seller list, checked October 2026.

Usually listed with, share of the foods that list it

  1. Flaxseed 42%
  2. Chicken 38%
  3. Chicken Fat 33%
  4. Chicken Meal 31%
  5. Peas 30%
  6. Oatmeal 25%
  7. Carrots 25%
  8. Sweet Potatoes 21%
  9. Brown Rice 19%
  10. Dried Plain Beet Pulp 18%
  11. Barley 18%
  12. Beef 16%

On the shelf

Foods that list it

297 foods in our reviews list it. Here are some of them.

Authority Homestyle Adult Wet Dog Food40.9% proteinHalo Elevate Homestyle Bone-In Grain Free Chicken Stew w/ Carrots & Spinach Wet Dog Food23.5% proteinMerrick Slow-Cooked BBQ Glazed Chicken Wet Dog Food44.4% proteinNutro Chicken Entreé topped with Bites of Real Chicken & Spinach Wet Dog Food40.9% proteinNutro Ultra Senior Trio of Proteins Chicken, Lamb & Whitefish with Superfoods Paté Wet Dog Food36.4% proteinThe Honest Kitchen Slow Cooked Chicken One Pot Stew Wet Dog Food50.0% protein
Show 54 more AvoDerm Grain Free 12 Cans- Chicken & Veggies Recipe In Gravy Wet Dog Food43.8% proteinAvoDerm Grain Free 12 Cans-Whitefish, Salmon & Veggies Recipe In Gravy Wet Dog Food43.8% proteinAvoDerm Grain Free 12 Cans- Stew Beef & Veggies Recipe In Gravy Wet Dog Food43.8% proteinEarthborn Holistic Grain Free Classics K95 Lamb Wet Dog Food40.9% proteinSimply Nourish Original Puppy Wet Dog Food58.8% proteinAbound Beef, Carrot & Tomato in Gravy Wet Dog Food44.4% proteinAbound Chicken, Peas & Sweet Potato in Gravy Wet Dog Food44.4% proteinRachael Ray Nutrish Lamb Stew With Carrots Wet Dog Food40.9% proteinRachael Ray Nutrish Chicken Muttballs Wet Dog Food40.9% proteinHalo Holistic Vegan Plant-Based Recipe Adult can (case of 12) Wet Dog Food26.1% proteinWellness Core Paté Whitefish, Salmon & Herring Wet Dog Food50.0% proteinWellness Core Turkey & Chicken Liver Wet Dog Food50.0% proteinSolid Gold Barking at the Moon Beef Food for Dogs | High Protein Wet Dog Food43.2% proteinSolid Gold Mighty Mini Turkey Food for Toy & Small Dogs | Small Breed Wet Dog Food41.7% proteinSolid Gold Mighty Mini Chicken Food for Toy & Small Dogs Wet Dog Food41.7% proteinHealth Extension food Grain Free Chunky Chicken Stew Wet Dog Food44.4% proteinNatural Balance Platefulls Tender Carrot, Potato & Beef Recipe Wet Dog Food42.0% proteinAuthority Healthy Weight Chicken Entree Adult Dog Wet Dog Food25.0% proteinNow Fresh Good Gravy Chicken & Salmon Minced Wet Dog Food38.9% proteinHealth Extension food Grain Free Northern Catch Wet Dog Food36.4% proteinHealth Extension food Grain Free New York Style Wet Dog Food40.9% proteinHealth Extension food Grain Free Savory Beef Stew Wet Dog Food44.4% proteinHealth Extension food Grain Free Carolina Skillet Wet Dog Food40.9% proteinHealth Extension food Grain Free Mediterranean Wet Dog Food38.6% proteinInstinct Raw Boost RawBoost+ Mixers Multivitamin Recipe Dog Food Topper38.3% proteinInstinct Freshly Crafted Meals Grass-Fed Beef Recipe Dog Food Topper45.0% proteinHill’s Hill’s Science Diet Puppy Small & Mini Savory Stew with Chicken & Vegetables Wet Dog Food27.8% proteinSimply Nourish Original Dog Meal Dog Food Topper58.3% proteinHill’s Hill’s Science Diet Adult Savory Stew with Chicken & Vegetables Wet Dog Food23.5% proteinHill’s Hill’s Science Diet Adult 7+ Savory Stew with Beef and Vegetables Wet Dog Food19.4% proteinPurina Beneful Freshly Prepared Stews Turkey Dinner with Spinach and Ditalini Pasta in Gravy Wet Dog Food44.4% proteinPurina ONE Beef & Barley Tender Cuts in Gravy Wet Dog Food50.0% proteinPurina ONE Lamb & Rice Healthy Puppy Wet Dog Food36.4% proteinPurina ONE Beef & Brown Rice Wet Dog Food36.4% proteinPurina ONE Vibrant Maturity Turkey & Barley Wet Dog Food36.4% proteinPurina ONE Chicken & Brown Rice Wet Dog Food36.4% proteinMerrick Classic Healthy Grains Kitchen Comforts Beef Tips & Rice Stew Wet Dog Food44.4% proteinNutro Ultra Trio of Proteins Chicken, Lamb & Whitefish with Superfoods Paté Wet Dog Food36.4% proteinCesar Home Delights Pot Roast with Spring Vegetables Dinner Wet Dog Food38.9% proteinStella & Chewy’s Wild Red Grain Free : Whole Prey Prairie Poultry Recipe, Raw Coated/Raw Blend Dry Dog Food40.9% proteinStella & Chewy’s SuperBlends Whitefish & Salmon : Raw Blend Oven Baked Kibble with Superfoods, Antioxidants & Probiotics Dry Dog Food30.7% proteinOrijen Wild Reserve, Wild-Caught Fish Recipe Dry Dog Food45.5% proteinOrijen Original Small Breed Puppy With WholePrey Nutrition Dry Dog Food43.2% proteinWellness Core+ Beef & Barley Recipe Dry Dog Food36.7% proteinStella & Chewy’s Wild Red Grain Free : Whole Prey Red Meat Recipe, Raw Coated Dry Dog Food39.8% proteinStella & Chewy’s Wild Red Grain Free : Whole Prey Red Meat Recipe, Raw Coated/Raw Blend Kibble – Protein Rich, Poultry Free, Legume Free Dry Dog Food40.9% proteinOpen Farm RawMix Grain-Free Chicken & Turkey Dry Dog Food33.3% proteinOpen Farm RawMix Grain-Free Whitefish Dry Dog Food33.3% proteinOpen Farm Large Breed RawMix – Grain Free Large Breed Dry Dog Food33.3% proteinOpen Farm Ancient Grains RawMix Wild Ocean Fish & Ancient Grains Dry Dog Food34.4% proteinOpen Farm RawMix Tide & Terrain Ancient Grains Dry Dog Food33.3% proteinOpen Farm RawMix Large Breed with Ancient Grains Dry Dog Food32.2% proteinHealth Extension Original Large Bites Chicken & Brown Rice Dry Dog Food26.7% proteinGo! Solutions Healthy Aging Salmon + Duck Dry Dog Food26.7% protein

Our read // On the bag

Read the whole formula beyond the greens

If spinach appears low on the list, treat it as a small vegetable addition. Check the food's nutritional adequacy statement and the ingredients that make up most of the recipe. Choose for the complete diet, not a promise about spinach's iron or antioxidants. For a dog with calcium oxalate stones, ask about the entire diet.

On labels as

Other names for this

Manufacturers do not all use the same wording. These all mean the same thing.

Fresh Spinach Organic Spinach

Sources

What we read

Checked September 1, 2026.

  1. 1 Dietary antioxidants and behavioral enrichment enhance neutrophil phagocytosis in geriatric Beagles Veterinary Immunology and Immunopathology, 2006 // Journal
  2. 2 Antioxidant supplementation increases retinal responses and decreases refractive error changes in dogs Journal of Nutritional Science, 2016 // Journal
  3. 3 Evaluation of the effect of dietary vegetable consumption on reducing risk of transitional cell carcinoma of the urinary bladder in Scottish Terriers Journal of the American Veterinary Medical Association, 2005 // Journal
  4. 4 Roles of plant-based ingredients and phytonutrients in canine nutrition and health Journal of Animal Physiology and Animal Nutrition, 2022 // Journal
  5. 5 The Effects of Biostimulants, Biofertilizers and Water-Stress on Nutritional Value and Chemical Composition of Two Spinach Genotypes (Spinacia oleracea L.) Molecules, 2019 // Journal
  6. 6 Nutritional characterization and food value addition properties of dehydrated spinach powder Food Science & Nutrition, 2021 // Journal
  7. 7 Treatment recommendations University of Minnesota College of Veterinary Medicine, n.d. // University
  8. 8 Reading Labels AAFCO, n.d. // Regulator
An ingredient on its own tells you very little. What matters is how much of it there is and where it sits in the list. That is why we weigh the top five rather than reacting to any single name further down. Back to the wiki

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