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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 7 foods we track

Share of foods that list it

15%

454 of the 3,105 foods with an ingredient list on file, from 59 brands. 230 dry dog food, 91 wet dog food, 59 frozen dog food.

Each square is 1% of the catalog

Where it sits on the label

Median position 17. In the top five of 22 foods, so it is usually a minor ingredient.

Top five List position, heaviest first

Above the salt

51%

Listed before the salt in 51% of foods. In the rest it is under about 1% of the recipe.

Price per lb

Foods with it $4.05
All foods $3.25

Median of the cheapest bag price across 227 priced foods, 25% above the catalog. The price is the food's, not the ingredient's.

Who leans on it

15%

of the foods that list it are from Wellness. 59 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 67
  2. Stella & Chewy's 56
  3. Instinct 32
  4. Health Extension 23
  5. Open Farm 21
  6. Smallbatch 19
  7. Purina 18
  8. Earthborn Holistic 15
  9. Diamond 14
  10. Lotus 14

Plus 49 more brands.

Amazon best sellers that list it

  1. #7 Stella & Chewy’s Marie’s Magical Dinner Dust Cage-Free Chicken Recipe Freeze-Dried Raw Dog Food Topper
  2. #8 Diamond Naturals Skin & Coat Formula All Life Stages Salmon & Potato Formula Dry Dog Food
  3. #43 Stella & Chewy’s Marie’s Magical Dinner Dust Grass-Fed Beef Recipe Freeze-Dried Raw Dog Food Topper
  4. #53 Orijen Original Grain-Free Dry Dog Food
  5. #57 Wellness Complete Health Deboned Chicken & Oatmeal Dry Dog Food
  6. #72 Wellness Complete Health Small Breed Turkey & Oatmeal Dry Dog Food
  7. #87 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. Chicken 38%
  2. Flaxseed 33%
  3. Carrots 30%
  4. Chicken Fat 26%
  5. Peas 24%
  6. Chicken Meal 23%
  7. Sweet Potatoes 22%
  8. Oatmeal 18%
  9. Beef 17%
  10. Brown Rice 16%
  11. Turkey 16%
  12. Dried Plain Beet Pulp 15%

On the shelf

Foods that list it

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

Against the Grain The Good Egg - Denver Omelet Wet Dog Food44.4% proteinAuthority Homestyle Adult Wet Dog Food40.9% proteinBones & Co Boosters Bark Boost Dog Food Topper15.4% proteinDave’s Pet Food Dave’s Stewlicious Chicken Pot Pie Dinner for Dogs / Grain-Free Wet Dog Food40.9% proteinEvanger’s EVX Restricted Diet: Digestion Bland Diet Wet Dog Food40.9% proteinEvanger’s Grain Free LID Venison + Beef Dinner Wet Dog Food40.9% proteinEvanger’s Grain Free; Super Premium Chicken Dinner Wet Dog Food40.9% proteinEvanger’s Super Premium Beef Dinner for Dogs - Case of 12 Grain-Free Wet Dog Food40.9% protein
Show 59 more ZIWI Steam & Dried Lamb with Green Vegetables Recipe Dog Food Topper38.6% proteinPurina Beneful Freshly Prepared Blends Salmon Wet Dog Food50.0% proteinPurina Beneful Prepared Meals Simmered Beef Wet Dog Food45.5% proteinOpen Farm Surf & Turf Raw Freeze-Dried Dog Food38.9% proteinStella & Chewy’s Raw Dinner Patties Beef & Salmon Perfectly Puppy Dinner Patties Freeze-Dried Dog Food48.4% proteinStella & Chewy’s Chicken Little Lil’ Bites - Raw for Small Breeds Freeze-Dried Dog Food50.5% proteinDr. Marty Nature’s Blend Premium Origin Freeze-Dried Dog Food40.4% proteinDr. Marty Nature’s Blend Small Breed Freeze-Dried Dog Food42.6% proteinWellness Bowl Boosters Tender Toppers Lamb & Salmon Grain-Free Dog Food Topper16.0% proteinTruDog Elevate Homestyle Bone-In Grain Free Chicken Stew w/ Carrots & Spinach Wet Dog Food23.5% proteinOpen Farm Pasture-raised Lamb Raw Freeze-Dried Dog Food38.9% proteinPurina Beneful Kitchen Creations Chicken & Veggies Wet Dog Food50.0% proteinOpen Farm Farmer’s Table Pork Raw Freeze-Dried Dog Food46.3% proteinPurina Beneful Kitchen Creations Lamb Veggies Wet Dog Food50.0% proteinNutriSource Turkey Dog Stew Tetrapaks Wet Dog Food40.0% proteinHill’s Science Diet Adult 7+ Senior Vitality Small & Mini Chicken & Vegetable Stew Wet Dog Food20.0% proteinHill’s Science Diet Puppy Savory Stew with Chicken & Vegetables Wet Dog Food30.6% proteinInstinct FreshDried Meal Blends Chicken & Harvest Blend Freeze-Dried Dog Food35.1% proteinInstinct Original Bites for Dogs Pollock Recipe Grain-Free Freeze-Dried Dog Food41.5% proteinInstinct FreshDried Raw Meals for Puppies Chicken Recipe Grain-Free Freeze-Dried Dog Food40.4% proteinBones & Co Cage-Free Chicken Raw - The Bones & Co. Freeze-Dried Dog Food36.6% proteinInstinct FreshDried Meal Blends Beef & Orchard Blend Freeze-Dried Dog Food36.2% proteinBones & Co Cage-Free Turkey Raw - The Bones & Co. Freeze-Dried Dog Food37.6% proteinNorthwest Naturals Nuggets; Bulk Meal Bars; Chubs Trout Recipe Frozen Dog Food25.0% proteinDr. Marty Nature’s Blend Active Vitality Freeze-Dried Dog Food42.6% proteinRaw Bistro Turkey Entree 4 Pack Frozen Dog Food53.8% proteinNulo Raw Chicken Recipe with Blueberries Freeze-Dried Dog Food42.1% proteinNulo Raw Lamb Recipe with Raspberries Freeze-Dried Dog Food31.6% proteinBones & Co Grass-Fed Beef Raw - The Bones & Co. Frozen Dog Food43.8% proteinBones & Co Cage-Free Turkey Raw - The Bones & Co. Frozen Dog Food41.9% proteinNulo Raw Turkey Recipe with Cranberries Freeze-Dried Dog Food42.1% proteinNulo Raw Duck Recipe with Pears Freeze-Dried Dog Food42.1% proteinBones & Co Grass-Fed Lamb Raw - The Bones & Co. Frozen Dog Food40.6% proteinNulo Raw Turkey & Salmon Recipe with Strawberries Freeze-Dried Dog Food42.1% proteinBones & Co Cage-Free Chicken Raw - The Bones & Co. Frozen Dog Food41.9% proteinNulo Raw Beef Recipe with Apples Freeze-Dried Dog Food31.6% proteinBones & Co Cage-Free Duck Raw - The Bones & Co. Frozen Dog Food45.3% proteinBones & Co Grass-Fed Beef Raw - The Bones & Co. Freeze-Dried Dog Food38.7% proteinStella & Chewy’s Purely Pork Dinner Patties Freeze-Dried Dog Food42.1% proteinStella & Chewy’s Raw Puppy Patties Chicken & Salmon Perfectly Puppy Dinner Patties Freeze-Dried Dog Food50.5% proteinRaw Bistro Beef Entree 4 Pack Frozen Dog Food46.7% proteinDr. Marty Nature’s Blend Healthy Growth Freeze-Dried Dog Food42.6% proteinOC Raw Dog Chicken & Produce Freeze-Dried Dog Food46.7% proteinStella & Chewy’s Itty Bitty Beef Lil’ Bites - Raw for Small Breeds Freeze-Dried Dog Food38.9% proteinSmallbatch Lamb Sliders Freeze-Dried Dog Food43.1% proteinOC Raw Dog Complete Meals Chicken & Produce Frozen Dog Food61.5% proteinOC Raw Dog Complete Meals Turkey & Produce Frozen Dog Food67.7% proteinSmallbatch Lamb Small Bites Freeze-Dried Dog Food43.6% proteinOC Raw Dog Duck & Produce Freeze-Dried Dog Food40.0% proteinOC Raw Dog Rabbit & Produce Freeze-Dried Dog Food62.2% proteinNorthwest Naturals Nuggets; Bulk Meal Bars Bison & Beef Recipe Frozen Dog Food45.2% proteinNorthwest Naturals Nuggets; Bulk Meal Bars; Chubs Lamb Recipe Frozen Dog Food46.7% proteinOC Raw Dog Beef & Produce Grain-Free Freeze-Dried Dog Food44.1% proteinDr. Marty Nature’s Blend Sensitivity Select Freeze-Dried Dog Food39.4% proteinRaw Bistro Turkey Entree 6 Pack Frozen Dog Food53.8% proteinGrandma Lucy’s Pureformance Pre-Mix Grain-Free Dog Food Topper21.9% proteinGrandma Lucy’s - Pureformance Fish Freeze-Dried Dog Food33.2% proteinGrandma Lucy’s - Pureformance Chicken Freeze-Dried Dog Food36.2% proteinSmallbatch Pork Sliders Freeze-Dried Dog Food55.2% 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

Fresh spinach: what changes

One page covers every name. Here is what each label word adds, and whether it changes anything for your dog.

Fresh spinach

Matters for your dog A little

Fresh Spinach

What it means AAFCO's feed term for fresh covers an ingredient that has not been frozen, cooked, dried, rendered or hydrolyzed, and is preserved only by refrigeration. The word describes the ingredient's condition; it promises nothing about nutrient content.

For your dog Raw baby spinach is about 94% water, so fresh leaves weigh far more than the same spinach dried and rank higher on a list sorted by weight. No study we found shows fresh-added spinach gives a dog more nutrition than dried.8,9,10

  1. Strong
  2. Some
  3. Thin
  4. None
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
  9. 9 Buyer Beware: What Research and Resulting Media Got Wrong About The Farmer's Dog's Recent Study BSM Partners, 2025 // Industry
  10. 10 Baby spinach (nutritional sheet) Aprifel, n.d. // Reference
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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