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.
Above the salt
Usually listed after the salt, which caps it at roughly 1% of the recipe in 70% of foods.
Price per lb
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
- 01 // Source Collard leaves Growers harvest the edible leaves as a vegetable crop.
- 02 // Process Cleaned and trimmed In a documented preparation, workers washed off soil and separated leaves from shoots.
- 03 // Process Dried and milled Drying removes water, and milling makes the leaves easier to mix into a kibble recipe.
- 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.
Why it is in the bag
What the manufacturer gets
-
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
-
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
-
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.
-
Brands say
Collards improve digestion and stool quality
Outruns the evidence
Evidence
- Strong
- Some
- Thin
- 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
-
Owners say
Collards protect dogs from bladder cancer
Outruns the evidence
Evidence
- Strong
- Some
- Thin
- 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
-
Brands say
Collards support stronger bones in dogs
Outruns the evidence
Evidence
- Strong
- Some
- Thin
- 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
-
Critics say
Collards are just filler
Outruns the evidence
Evidence
- Strong
- Some
- Thin
- 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
-
Q01
Is it just filler?
NoCollard 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
-
Q02
Does it prevent cancer?
No proofThe 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
-
Q03
How much is in the bag?
Not disclosedIngredients 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
Usually listed with, share of the foods that list it
- Red Lentils 56%
- Chicken 56%
- Turkey 56%
- Whole Herring 38%
- Chicken Liver 38%
- Salmon 31%
- Pinto Beans 31%
- Green Peas 31%
- Herring Meal 25%
- Pork Meal 25%
- Pollock Meal 25%
- 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 Nutrient and Phytochemical Composition of Nine African Leafy Vegetables: A Comparative Study
- 2 Evaluation of the effect of dietary vegetable consumption on reducing risk of transitional cell carcinoma of the urinary bladder in Scottish Terriers
- 3 Assessing non-protein nitrogen sources in commercial dry dog foods
- 4 What’s in the Ingredients List?
- 5 How dry pet food is made
- 6 “Complete and Balanced” Pet Food
- 7 Treatment recommendations
- 8 Pet Food Production and Ingredient Analysis
- 9 Collard Greens in Dog Food