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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

Straight answer

Is Spinach safe for dogs?

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.

Why it is in the food
Small vegetable addition

Our read // In our catalog

In 1 of every 7 foods we track

Share of foods that list it

15%

474 of the 3,204 foods with an ingredient list on file, from 59 brands. 232 dry dog food, 101 wet dog food, 63 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 $4.02
All foods $3.25

Median of the cheapest bag price across 230 priced foods, 24% above the catalog. The price is the food's, not the ingredient's.

Who leans on it

14%

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

Usually listed with, share of the foods that list it

  1. Chicken 38%
  2. Flaxseed 35%
  3. Carrots 34%
  4. Mixed Tocopherols 30%
  5. Chicken Fat 25%
  6. Peas 24%
  7. Sweet Potatoes 22%
  8. Chicken Meal 22%
  9. Beef 18%
  10. Oatmeal 17%
  11. Turkey 16%
  12. Brown Rice 16%

On the shelf

Foods that list Spinach

474 foods in our catalog list it. These 60 list it highest on the label.

Show 48 more
The Honest Kitchen Slow Cooked Chicken One Pot Stew Wet Dog FoodThe Honest KitchenThe Honest Kitchen Slow Cooked Chicken One Pot Stew Wet Dog FoodWet // No. 4 on the labelThe Honest Kitchen Turkey & Autumn Veggies Butcher Block Pâté Wet Dog FoodThe Honest KitchenThe Honest Kitchen Turkey & Autumn Veggies Butcher Block Pâté Wet Dog FoodWet // No. 4 on the labelEvanger’s EVX Restricted Diet: Digestion Bland Diet Wet Dog FoodEvanger'sEvanger’s EVX Restricted Diet: Digestion Bland Diet Wet Dog FoodWet // No. 5 on the labelEvanger’s Super Premium Lamb & Rice Dinner Wet Dog FoodEvanger'sEvanger’s Super Premium Lamb & Rice Dinner Wet Dog FoodWet // No. 5 on the labelEvanger’s Super Premium Beef Dinner for Dogs Grain-Free Wet Dog FoodEvanger'sEvanger’s Super Premium Beef Dinner for Dogs Grain-Free Wet Dog FoodWet // No. 5 on the labelEvanger’s Grain Free LID Venison + Beef Dinner Wet Dog FoodEvanger'sEvanger’s Grain Free LID Venison + Beef Dinner Wet Dog FoodWet // No. 5 on the labelHalo Elevate Homestyle Bone-In Grain Free Chicken Stew w/ Carrots & Spinach Wet Dog FoodHaloHalo Elevate Homestyle Bone-In Grain Free Chicken Stew w/ Carrots & Spinach Wet Dog FoodWet // No. 5 on the labelAuthority Homestyle Adult Wet Dog FoodAuthorityAuthority Homestyle Adult Wet Dog FoodWet // No. 5 on the labelMerrick Slow-Cooked BBQ Glazed Chicken Grain-Free Wet Dog FoodMerrickMerrick Slow-Cooked BBQ Glazed Chicken Grain-Free Wet Dog FoodWet // No. 5 on the labelNutro Chicken Entreé topped with Bites of Real Chicken & Spinach Grain-Free Wet Dog FoodNutroNutro Chicken Entreé topped with Bites of Real Chicken & Spinach Grain-Free Wet Dog FoodWet // No. 5 on the labelStella & Chewy’s Marie’s Magical Dinner Dust Cage-Free Chicken Recipe Freeze-Dried Raw Dog Food TopperStella & Chewy'sStella & Chewy’s Marie’s Magical Dinner Dust Cage-Free Chicken Recipe Freeze-Dried Raw Dog Food TopperTopper // No. 6 on the labelOpen Farm Herring & Mackerel Rustic Stew Dog Food TopperOpen FarmOpen Farm Herring & Mackerel Rustic Stew Dog Food TopperTopper // No. 6 on the labelBones & Co Cage-Free Turkey Raw - The Bones & Co. Freeze-Dried Dog FoodBones & CoBones & Co Cage-Free Turkey Raw - The Bones & Co. Freeze-Dried Dog FoodFreeze-Dried // No. 6 on the labelBones & Co Cage-Free Chicken Raw - The Bones & Co. Freeze-Dried Dog FoodBones & CoBones & Co Cage-Free Chicken Raw - The Bones & Co. Freeze-Dried Dog FoodFreeze-Dried // No. 6 on the labelBones & Co Grass-Fed Beef Raw - The Bones & Co. Freeze-Dried Dog FoodBones & CoBones & Co Grass-Fed Beef Raw - The Bones & Co. Freeze-Dried Dog FoodFreeze-Dried // No. 6 on the labelBones & Co Cage-Free Chicken Raw - The Bones & Co. Frozen Dog FoodBones & CoBones & Co Cage-Free Chicken Raw - The Bones & Co. Frozen Dog FoodFrozen // No. 6 on the labelBones & Co Cage-Free Turkey Raw - The Bones & Co. Frozen Dog FoodBones & CoBones & Co Cage-Free Turkey Raw - The Bones & Co. Frozen Dog FoodFrozen // No. 6 on the labelBones & Co Cage-Free Duck Raw - The Bones & Co. Frozen Dog FoodBones & CoBones & Co Cage-Free Duck Raw - The Bones & Co. Frozen Dog FoodFrozen // No. 6 on the labelBones & Co Grass-Fed Lamb Raw - The Bones & Co. Frozen Dog FoodBones & CoBones & Co Grass-Fed Lamb Raw - The Bones & Co. Frozen Dog FoodFrozen // No. 6 on the labelBones & Co Grass-Fed Beef Raw - The Bones & Co. Frozen Dog FoodBones & CoBones & Co Grass-Fed Beef Raw - The Bones & Co. Frozen Dog FoodFrozen // No. 6 on the labelStella & Chewy’s Chicken Little Lil’ Bites - Raw for Small Breeds Freeze-Dried Dog FoodStella & Chewy'sStella & Chewy’s Chicken Little Lil’ Bites - Raw for Small Breeds Freeze-Dried Dog FoodFreeze-Dried // No. 6 on the labelDave’s Pet Food Dave’s Stewlicious Chunky Chicken and Rice Stew for Dogs / Wet Dog FoodDave's Pet FoodDave’s Pet Food Dave’s Stewlicious Chunky Chicken and Rice Stew for Dogs / Wet Dog FoodWet // No. 6 on the labelWeruva Dogs in the Kitchen Classic Dog Peking Ducken Chicken & Duck in Gravy Wet Dog FoodWeruvaWeruva Dogs in the Kitchen Classic Dog Peking Ducken Chicken & Duck in Gravy Wet Dog FoodWet // No. 6 on the labelWeruva Dogs in the Kitchen Classic Dog Green Eggs & Chicken with Pumpkin & Greens Grain-Free Wet Dog FoodWeruvaWeruva Dogs in the Kitchen Classic Dog Green Eggs & Chicken with Pumpkin & Greens Grain-Free Wet Dog FoodWet // No. 6 on the labelNow Fresh Good Gravy Chicken & Salmon Minced Grain-Free Wet Dog FoodNow FreshNow Fresh Good Gravy Chicken & Salmon Minced Grain-Free Wet Dog FoodWet // No. 6 on the labelSimply Nourish Original Dog Meal Dog Food TopperSimply NourishSimply Nourish Original Dog Meal Dog Food TopperTopper // No. 6 on the labelPurina Beneful Freshly Prepared Stews Turkey Dinner with Spinach and Ditalini Pasta in Gravy Wet Dog FoodPurinaPurina Beneful Freshly Prepared Stews Turkey Dinner with Spinach and Ditalini Pasta in Gravy Wet Dog FoodWet // No. 6 on the labelCesar Simply Crafted Adult Chicken Dog Food TopperCesarCesar Simply Crafted Adult Chicken Dog Food TopperTopper // No. 6 on the labelMerrick Kitchen Comforts Beef Tips & Rice Stew Wet Dog FoodMerrickMerrick Kitchen Comforts Beef Tips & Rice Stew Wet Dog FoodWet // No. 6 on the labelNutro Ultra Trio of Proteins Chicken, Lamb & Whitefish with Superfoods Paté Grain-Free Wet Dog FoodNutroNutro Ultra Trio of Proteins Chicken, Lamb & Whitefish with Superfoods Paté Grain-Free Wet Dog FoodWet // No. 6 on the labelStella & Chewy’s Tantalizing Turkey Frozen Raw Dinner Patties Frozen Dog FoodStella & Chewy'sStella & Chewy’s Tantalizing Turkey Frozen Raw Dinner Patties Frozen Dog FoodFrozen // No. 6 on the labelStella & Chewy’s Tantalizing Turkey Frozen Raw Dinner Morsels Frozen Dog FoodStella & Chewy'sStella & Chewy’s Tantalizing Turkey Frozen Raw Dinner Morsels Frozen Dog FoodFrozen // No. 6 on the labelStella & Chewy’s Chewy’s Chicken Frozen Raw Patties Frozen Dog FoodStella & Chewy'sStella & Chewy’s Chewy’s Chicken Frozen Raw Patties Frozen Dog FoodFrozen // No. 6 on the labelStella & Chewy’s Chewy’s Chicken Frozen Raw Dinner Morsels Frozen Dog FoodStella & Chewy'sStella & Chewy’s Chewy’s Chicken Frozen Raw Dinner Morsels Frozen Dog FoodFrozen // No. 6 on the labelStella & Chewy’s Absolutely Rabbit Frozen Raw Dinner Patties Frozen Dog FoodStella & Chewy'sStella & Chewy’s Absolutely Rabbit Frozen Raw Dinner Patties Frozen Dog FoodFrozen // No. 6 on the labelStella & Chewy’s Raw Puppy Patties Chicken & Salmon Perfectly Puppy Dinner Patties Freeze-Dried Dog FoodStella & Chewy'sStella & Chewy’s Raw Puppy Patties Chicken & Salmon Perfectly Puppy Dinner Patties Freeze-Dried Dog FoodFreeze-Dried // No. 7 on the labelRaw Bistro Beef Entree 4 Pack Frozen Dog FoodRaw BistroRaw Bistro Beef Entree 4 Pack Frozen Dog FoodFrozen // No. 7 on the labelOC Raw Dog Complete Meals Lamb & Produce Frozen Dog FoodOC Raw DogOC Raw Dog Complete Meals Lamb & Produce Frozen Dog FoodFrozen // No. 7 on the labelOC Raw Dog Complete Meals Turkey & Produce Frozen Dog FoodOC Raw DogOC Raw Dog Complete Meals Turkey & Produce Frozen Dog FoodFrozen // No. 7 on the labelJinx Beef & Chicken Homemades Grain-Free Wet Dog FoodJinxJinx Beef & Chicken Homemades Grain-Free Wet Dog FoodWet // No. 7 on the labelEarthborn Holistic Grain Free Classics K95 Lamb Wet Dog FoodEarthborn HolisticEarthborn Holistic Grain Free Classics K95 Lamb Wet Dog FoodWet // No. 7 on the labelNatural Balance Platefulls Tender Carrot, Potato & Beef Recipe Wet Dog FoodNatural BalanceNatural Balance Platefulls Tender Carrot, Potato & Beef Recipe Wet Dog FoodWet // No. 7 on the labelAuthority Healthy Weight Chicken Entree Adult Dog Wet Dog FoodAuthorityAuthority Healthy Weight Chicken Entree Adult Dog Wet Dog FoodWet // No. 7 on the labelInstinct Freshly Crafted Meals Grass-Fed Beef Recipe Dog Food TopperInstinctInstinct Freshly Crafted Meals Grass-Fed Beef Recipe Dog Food TopperTopper // No. 7 on the labelHill’s Prescription Diet Gastrointestinal Biome Wet Dog FoodHill'sHill’s Prescription Diet Gastrointestinal Biome Wet Dog FoodWet // No. 7 on the labelPurina Beneful Freshly Prepared Classics With Salmon, Green Beans and Spinach Pate Wet Dog FoodPurinaPurina Beneful Freshly Prepared Classics With Salmon, Green Beans and Spinach Pate Wet Dog FoodWet // No. 7 on the labelWellness Core Bowl Boosters Functional Toppers Joint Health Dog Food TopperWellnessWellness Core Bowl Boosters Functional Toppers Joint Health Dog Food TopperTopper // No. 7 on the labelTruDog Garden of Vegan Plant-Based Recipe Adult Grain-Free Wet Dog FoodTruDogTruDog Garden of Vegan Plant-Based Recipe Adult Grain-Free Wet Dog FoodWet // No. 8 on the label

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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