Skip to content
In The Kibble
My dogs

Ingredient file // Fruit or vegetable

Collard Greens

A real leaf with unproven dog benefits

Collard greens are harvested leaves that add plant fiber and minerals to a recipe. The available collard research measures the leaves, not their effects in dogs, so the ingredient does not promise firmer stools, stronger bones, or disease prevention.

What it is
Edible collard leaves used as a vegetable ingredient in dog food, often dried and ground for kibble.
Made from
Harvested collard leaves
Main job
Named vegetable and fiber
Typical amount
Not published
Watch for
Extra servings for dogs with calcium oxalate stones
Not the same as
Kale or spinach

Our read // In our catalog

In 1 of every 162 foods we track

Share of foods that list it

1%

16 of the 2,595 foods with an ingredient list on file, from 2 brands. All dry dog food.

Each square is 1% of the catalog

Where it sits on the label

Median position 28. In the top five of 0 foods, so it is usually a minor ingredient.

Top five List position, heaviest first

Above the salt

30%

Usually listed after the salt, which caps it at roughly 1% of the recipe in 70% of foods.

Price per lb

Foods with it $3.92
All foods $3.23

Median of the cheapest bag price across 16 priced foods, 21% above the catalog. The price is the food's, not the ingredient's.

Who leans on it

56%

of the foods that list it are from Acana. 2 brands use it in total.

What it is

How it is made

Collards are grown for their leaves, not recovered from a food-processing waste stream. Fresh leaves contain much water; drying and milling let a kibble maker store and mix them with other ingredients.1,5,8

  1. 01 // Source Collard leaves Growers harvest the edible leaves as a vegetable crop.
  2. 02 // Process Cleaned and trimmed In a documented preparation, workers washed off soil and separated leaves from shoots.
  3. 03 // Process Dried and milled Drying removes water, and milling makes the leaves easier to mix into a kibble recipe.
  4. 04 // Output Prepared greens The dry, ground leaves join other ingredients before the kibble dough is cooked.

What is in it

Composition, dry matter

35

% fiber

Dietary fiber in tested collard leaves. The leaf contains fiber, but a bag does not disclose how much collard fiber its recipe supplies.

Dietary fiber 35%1
Crude protein 26.4%1
True protein 21.2%1
Ash 13%1
Starch 1.7%1

These are averages from sampled market leaves, not a range for pet-food batches. Leaf maturity and growing conditions can change composition. Crude protein also counts nitrogen that is not true protein.1

Why it is in the bag

What the manufacturer gets

  1. 01

    Adds vegetable fiber

    Collard leaves contain dietary fiber, which contributes to the recipe's fiber total. Leaf analysis alone cannot predict a dog's stool response.1

  2. 02

    Adds a named green

    A published dry-food ingredient list places collards beside other leafy greens. The name gives shoppers a recognizable vegetable, though that list does not reveal its amount.3,4

  3. 03

    Uses a specialty crop

    An industry report classifies collards as a specialty crop rather than an upcycled residue. Harvesting and drying create a separate supply item; no collard-specific cost advantage was published.5,8

How much No collard-specific feeding rate was found; one published dry-food list names collards among other greens but gives no weight.3,4

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

    Collards improve digestion and stool quality

    Outruns the evidence

    Evidence

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

    Brands promote collards for digestion. A leaf analysis measured about 35% dietary fiber, but tested no dogs. That number does not show whether collards change stool quality at the amount used in kibble.1,9

  2. Owners say

    Collards protect dogs from bladder cancer

    Outruns the evidence

    Evidence

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

    A case-control study included 92 Scottish Terriers with bladder cancer and 83 controls. Green leafy vegetable intake was associated with lower risk, but only 1 control reportedly ate collards. The study cannot assign that association to collards.2

  3. Brands say

    Collards support stronger bones in dogs

    Outruns the evidence

    Evidence

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

    A brand points to collard minerals for bone health. Laboratory testing found calcium in the leaves, but measured no dogs or bone outcomes. The collard amount in finished food is also unknown.1,9

  4. Critics say

    Collards are just filler

    Outruns the evidence

    Evidence

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

    In laboratory testing, collard leaves contained dietary fiber, true protein, and minerals. They contribute material nutrients, though an ingredient name alone cannot show how much they contribute to a finished food.1,4

Straight answers

What owners ask

  1. Q01

    Is it just filler?

    No

    Collard leaves contain fiber and minerals, so they have a nutritional role. The label gives no collard amount, however. Read the ingredients above them and the nutritional adequacy statement to judge the food.1,4,6

  2. Q02

    Does it prevent cancer?

    No proof

    The Scottish Terrier study associated green leafy vegetables as a group with lower bladder cancer risk. It was observational, and only 1 control reportedly ate collards. It did not test collards in kibble.2

  3. Q03

    How much is in the bag?

    Not disclosed

    Ingredients appear in descending order by weight, but the list gives no weight for collards. One published food placed them among other greens; that single example cannot tell you the amount in other recipes.3,4

Who uses it

Brands, best sellers and the company it keeps

Top brands, by foods that list it

  1. Acana 9
  2. Orijen 7

Usually listed with, share of the foods that list it

  1. Red Lentils 56%
  2. Chicken 56%
  3. Turkey 56%
  4. Whole Herring 38%
  5. Chicken Liver 38%
  6. Salmon 31%
  7. Pinto Beans 31%
  8. Green Peas 31%
  9. Herring Meal 25%
  10. Pork Meal 25%
  11. Pollock Meal 25%
  12. Pork 25%

Our read // On the bag

Read past the greens to the recipe

Look at what sits above collards on the ingredient list, then check the nutritional adequacy statement. Collards add some vegetable material, but their listed name gives no dose and proves no stool, bone, or cancer benefit. Do not choose a bag for a collard claim.

Sources

What we read

Checked October 1, 2026.

  1. 1 Nutrient and Phytochemical Composition of Nine African Leafy Vegetables: A Comparative Study Foods, 2025 // Journal
  2. 2 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
  3. 3 Assessing non-protein nitrogen sources in commercial dry dog foods Translational Animal Science, 2022 // Journal
  4. 4 What’s in the Ingredients List? AAFCO, n.d. // Regulator
  5. 5 How dry pet food is made FEDIAF, n.d. // Industry
  6. 6 “Complete and Balanced” Pet Food U.S. Food and Drug Administration, n.d. // Government
  7. 7 Treatment recommendations University of Minnesota College of Veterinary Medicine, n.d. // University
  8. 8 Pet Food Production and Ingredient Analysis Pet Food Institute, 2025 // Industry
  9. 9 Collard Greens in Dog Food Maev, n.d. // Industry
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

Keep In The Know,
Know What's In The Bowl

The In the Kibble newsletter. Useful emails for dog owners: what we find inside dog food, how to feed well, and a heads-up when a food is recalled.
DOUBLE OPT-IN // ONE CLICK TO STOP // NEVER SHARED