Marco Williams
Walk down any pet food aisle and you’ll notice grain-free bags cost more and get marketed like they’re the obviously healthier choice. That’s not really true, and for some dogs, grain-free can work against them.
This guide breaks down what grain-free and grain-inclusive actually mean, compares 7 real products side by side on price and nutrition, and covers what the FDA’s investigation into grain-free diets and heart disease found, pulled directly from FDA.gov rather than secondhand blog posts. By the end, you’ll know which category fits your dog and which specific products are worth buying.
- Best Overall → Purina Pro Plan Complete Essentials — ~$1.24/day
- Best Grain-Free → Taste of the Wild High Prairie — ~$1.25/day
- Best Budget → Purina ONE Chicken & Rice — ~$0.87/day
- Best Vet-Formulated → Hill’s Science Diet Chicken & Barley — ~$2.07/day
Grain Free vs Grain Inclusive at a Glance
| Basis | Typical Carb Source | Best For | Price Range | AAFCO Method |
|---|---|---|---|---|
| Grain-Free | Peas, lentils, chickpeas, potatoes | Rare diagnosed grain allergies, vet-directed diets | $1.25–$1.63/day | Formulated |
| Grain-Inclusive | Rice, oats, barley, corn, wheat | Most healthy adult dogs | $0.87–$2.07/day | Formulated or feeding trial |
All 7 Products Compared
| Product | Type | Price | Protein | Cost/Day |
|---|---|---|---|---|
| Blue Buffalo Wilderness Chicken | Grain-Free | $63.98 (24 lb) | 34% | $1.61 |
| Purina ONE True Instinct Beef | Grain-Free | $69.50 (25 lb) | 30% | $1.63 |
| Taste of the Wild High Prairie | Grain-Free | $58.99 (28 lb) | 32% | $1.25 |
| Purina Pro Plan Complete Essentials | Grain-Inclusive | $74.48 (35 lb) | 26% | $1.24 |
| Hill’s Science Diet Chicken & Barley | Grain-Inclusive | $51.99 (15 lb) | 20% | $2.07 |
| Royal Canin Medium Adult | Grain-Inclusive | $99.99 (30 lb) | 23% | $2.03 |
| Purina ONE Chicken & Rice | Grain-Inclusive | $48.98 (31.1 lb) | 26% | $0.87 |
Cost per day doesn’t track with grain status. The cheapest option here ($0.87/day) and the second priciest ($2.07/day) are both grain-inclusive. Price tier, boutique versus mass-market, drives cost far more than whether the bag says “grain-free.”
What “Grain Free” and “Grain Inclusive” Actually Mean?
AAFCO’s Definition
“Grain-free” simply means the food contains no wheat, corn, rice, barley, or other grains. It’s not a certified nutritional standard, and AAFCO doesn’t officially define or regulate the term. Brands apply it to their own products.
Grain-free formulas typically replace grains with:
- Peas
- Lentils
- Chickpeas
- Potatoes or sweet potatoes
What’s in Grain Inclusive Formulas?
Grain-inclusive foods use one or more of these as a primary carb and energy source:
- Rice
- Oats
- Barley
- Corn
- Wheat
These aren’t fillers. Whole grains supply digestible energy, B vitamins, and fiber that support normal digestion in most dogs.
Formulated vs Feeding-Trial AAFCO Statements
Every complete and balanced dog food carries an AAFCO nutritional adequacy statement, but not all statements are earned the same way. “Formulated” means the recipe was lab-calculated to meet AAFCO’s nutrient minimums. “Feeding trial” means the food was actually fed to a group of dogs under AAFCO protocol to confirm real-world adequacy, which is a slightly stronger claim.
Of the 7 products here, Purina Pro Plan, Hill’s Science Diet, and Purina ONE Chicken & Rice all use the feeding-trial method. The other four, including all three grain-free picks, use the formulated method.
Grain Free Dog Food: Top Picks
Best for: Active, high-energy dogs needing a higher protein percentage
Cost per day: $1.61
Why It Made the List?
- Real deboned chicken is the first ingredient, backed by chicken meal as the second
- Highest protein content (34% minimum) of the three grain-free picks in this comparison
- Amazon’s Choice badge with 500+ bought in the past month and a 4.7-star average across 5,129 ratings
Key Specs
- 34% protein min, 15% fat min, 6% fiber max, 3,652 kcal/kg
- Formulated to meet AAFCO Dog Food Nutrient Profiles for adult maintenance
- First 5 ingredients: deboned chicken, chicken meal, peas, pea protein, tapioca starch
Honest Take
- Chicken and chicken meal lead the list, but peas and pea protein sit right behind at positions three and four, the legume-heavy pattern the FDA flagged in its DCM investigation
- Doesn’t mean the food is dangerous, but worth knowing before you buy, especially for large-breed dogs
- Most common owner report: improved coat condition and reduced skin irritation, reflected in Chewy’s “Ingredient Quality” score of 82% positive across reviews.
- Most common complaint: kibble size runs large for dogs under 15 lb
Best for: Owners who want grain-free without the boutique-brand price tag
Cost per day: $1.63
Why It Made the List?
- Real beef as the first ingredient at a mass-market price point
- Comes from a brand line with feeding-trial-validated sister formulas
- Amazon’s Choice badge, 4.6-star average across 591 ratings
Key Specs
- 30% protein min, 3,764 kcal/kg
- Formulated to meet AAFCO Dog Food Nutrient Profiles for adult maintenance
- First 5 ingredients: beef, chicken meal, canola meal, lentil flour, pea starch
Honest Take
- Beef leads the list, but lentil flour and pea starch appear in the top eight ingredients, the same legume pattern seen across most grain-free formulas regardless of price tier
- A lower price doesn’t change the DCM risk profile if that’s a concern for your dog’s breed
- Most common owner report: dogs switching from a previous food that caused illness settled well on this formula, with several owners noting increased enthusiasm at mealtime.
- Most common complaint: picky eaters sometimes reject the beef flavor specifically, even when the same dogs accept the turkey and venison variant
Best for: Dogs needing a protein rotation away from chicken or beef
Cost per day: $1.25
Why It Made the List?
- Novel proteins (bison, venison) at the lowest daily cost among the three grain-free picks
- Amazon’s Choice badge with 8,000+ bought in the past month
- 4.6-star average across 12,900 ratings, the largest review base of the three grain-free picks
Key Specs
- 32% protein min, 18% fat min, 4% fiber max, 3,719 kcal/kg
- Formulated to meet AAFCO Dog Food Nutrient Profiles for adult maintenance
- First 5 ingredients: water buffalo, lamb meal, chicken meal, sweet potatoes, peas
Honest Take
- The flavor name says Roasted Bison & Roasted Venison, but the ingredient list actually leads with water buffalo and lamb meal; bison and venison show up further down, after peas and pea flour
- Not misleading exactly, but don’t assume bison is the dominant protein just from the product name
- Most common owner report: long-term feeders describe consistently good digestion, with no recurring bowel issues or weight problems reported over years of use.
- Most common complaint: some reviewers note the marketed proteins (bison, venison) make up a smaller share of the recipe than the product name implies
Grain Inclusive Dog Food: Top Picks
Best for: General healthy adult dogs with no special dietary needs
Cost per day: $1.24
Why It Made the List?
- Feeding-trial-validated adequacy rather than lab-formulated only
- Guaranteed live probiotics and a multi-grain carb base at a mid-range price
- Amazon’s Choice badge, 20,000+ bought in the past month, 4.6-star average across 16,933 ratings
Key Specs
- 26% protein min, 3,790 kcal/kg
- Feeding-trial AAFCO validation for adult maintenance
- First 5 ingredients: chicken, rice, whole grain wheat, poultry by-product meal, soybean meal
Honest Take
- Chicken and rice lead the list, backed by whole grain wheat, whole grain corn, and soybean meal, a genuinely diverse carb base rather than a single grain
- Poultry by-product meal is present; not a red flag on its own since it includes nutrient-dense organ meat, but worth knowing if you specifically avoid by-products
- Most common owner report: shiny, healthy coats and long-term feeders reporting dogs outliving typical life expectancy on this formula.
- Most common complaint: the shredded chicken pieces in the blend can run inconsistent from bag to bag, with some owners noting fewer visible chicken shreds than expected
Best for: Owners who prioritize feeding-trial-validated nutrition over price
Cost per day: $2.07
Why It Made the List?
- The most grain-diverse formula in this comparison, using four separate grain sources
- Feeding-trial adequacy claim from a brand widely used in veterinary settings
- Highest rating average of the 7 picks: 4.8 stars across 9,243 ratings
Key Specs
- 20% protein min, 11.5% fat min, 4% fiber max, roughly 3,692 kcal/kg
- Feeding-trial AAFCO validation for adult maintenance
- First 5 ingredients: chicken, cracked pearled barley, brown rice, brewers rice, whole grain wheat
Honest Take
- Uses four separate grain sources rather than leaning on one, but protein is the lowest of the 7 picks at 20% minimum
- Better suited to a lower-activity adult dog than a high-energy working breed; this is also the most expensive pick per day in the comparison
- Most common owner report: improved coat shine plus joint, immune, and muscle health, with reviewers noting dogs eat the food eagerly.
- Most common complaint: a small minority mention occasional formula changes or individual dogs not taking to it, though this represents a small fraction of overall feedback
Best for: Dogs between 23 and 55 lb specifically
Cost per day: $2.03
Why It Made the List?
- Calorie and nutrient dosing built specifically for the 23–55 lb medium-breed weight range
- Clinically proven antioxidant blend (vitamins C and E) plus prebiotics for gut health
- Amazon’s Choice badge, 2,000+ bought in the past month, 4.7-star average across 3,892 ratings
Key Specs
- 23% protein min, 12% fat min, 3.4% fiber max, 3,616 kcal/kg
- Formulated to meet AAFCO Dog Food Nutrient Profiles for adult maintenance
- First 5 ingredients: brewers rice, chicken by-product meal, oat groats, wheat, corn protein meal
Honest Take
- The higher cost isn’t arbitrary; Royal Canin tunes this formula specifically for the 23–55 lb weight range, unlike the other six products in this list, which use general all-breed-size feeding guides
- The ingredient list leads with brewers rice and chicken by-product meal rather than a named whole meat, which some owners specifically look to avoid
- Most common owner report: shiny coats and long-term brand loyalty, with several reviewers noting they’ve fed Royal Canin across multiple dogs and life stages.
- Most common complaint: kibble size runs large for dogs on the lower end of the 23 lb weight bracket, occasionally causing picky dogs to refuse it
Best for: Budget-conscious owners and multi-dog households
Cost per day: $0.87
Why It Made the List?
- The lowest daily cost in this entire comparison, at $0.87/day for a 50 lb dog
- Feeding-trial AAFCO validation despite the budget price point
- Amazon’s Choice badge, 10,000+ bought in the past month, 4.6-star average across 21,344 ratings, the largest review base of all 7 products
Key Specs
- 26% protein min, 16% fat min, 3% fiber max, 4,004 kcal/kg
- Feeding-trial AAFCO validation for adult maintenance
- First 5 ingredients: chicken, rice flour, corn gluten meal, whole grain corn, chicken by-product meal
Honest Take
- Real chicken leads the list, followed by rice flour, corn gluten meal, and whole grain corn; a multi-grain, budget-tier formula that doesn’t try to be a boutique food
- Chicken by-product meal is present, but the food is feeding-trial validated and costs less than a dollar a day for a 50 lb dog
- Most common owner report: strong palatability, with even picky eaters reported to eat eagerly and enjoy the mix of crunchy kibble and soft morsels.
- Most common complaint: a recurring subset of reviewers report digestive upset, including vomiting or increased thirst, sometimes tied to suspected formula or batch changes
The FDA Investigation Into Grain Free Diets and Heart Disease (DCM)
In July 2018, the FDA opened an investigation into reports of canine dilated cardiomyopathy (DCM) in dogs eating certain pet foods, many labeled grain-free, that contained a high proportion of peas, lentils, other legumes, or potatoes as main ingredients.
What the FDA found, based on data collected through April 2019:
- 91% of the implicated products were labeled grain-free
- 93% of implicated products contained peas and/or lentils
- Lab testing found grain-free and grain-containing products had similar protein, fat, and taurine levels on a dry-matter basis; no clear nutritional deficiency was identified in testing itself
The key nuance is that legume content got flagged, not the absence of grain by itself. A grain-free food without a legume-heavy ingredient profile doesn’t carry the same pattern the FDA was investigating.
As of December 2022, the FDA stated it does not intend to release further public updates unless meaningful new scientific information emerges. That means the investigation is dormant, not formally closed with a conclusion either way. It remains an open, unresolved question, not a proven causal link and not a debunked myth either.
If your dog has been on a legume-heavy grain-free diet long-term, consult your vet about a cardiac screening, especially if your dog’s breed isn’t typically genetically predisposed to DCM.
Do Dogs Actually Get Grain Allergies?
Probably not. A review published in Critical Reviews in Food Science and Nutrition found that only about 1% of food-allergic dogs react to grains. Most canine food allergies come from animal proteins instead:
- Beef: 34% of food-allergic dogs
- Dairy: 17%
- Chicken: 15%
- Wheat: 13%
- Rice: just 2%
True gluten sensitivity in dogs is essentially isolated to a documented case in Irish Setters and Border Terriers. It isn’t a widespread issue.
If your dog switches to grain-free and seems to improve, it’s often because the new formula also happens to use a different protein source, like lamb or salmon instead of chicken, not because the grain itself was the problem.
Suspect a grain allergy? Don’t self-diagnose from the ingredient label. Consult your vet about a proper elimination diet before switching foods. It’s the only reliable way to identify the actual trigger.
Which Should You Choose? A Decision Framework
Choose Grain Inclusive If…
- Generally healthy adult, no diagnosed allergy → grain-inclusive is the safer default
- Want a DCM-risk-conscious choice → grain-inclusive avoids the legume-heavy pattern entirely
- Sensitive stomach → grains like rice and oats are often easier to digest than legume-heavy blends
- Want feeding-trial-validated nutrition → Purina Pro Plan, Hill’s, and Purina ONE Chicken & Rice all qualify
Choose Grain Free If…
- Vet-diagnosed grain allergy → confirmed through a proper elimination diet, not a guess
- Vet-directed therapeutic diet → your vet has a specific clinical reason for the switch
Recall History: Does Grain Free or Grain Inclusive Have More Recalls?
A check of FDA.gov shows recent pet food recalls have been driven by contamination issues, including Listeria, Salmonella, and foreign material, across raw, wet, and dry segments alike. None of the current recall activity is tied specifically to grain-free or grain-inclusive formulations as a category.
Recall risk isn’t meaningfully connected to whether a food contains grain. Don’t use “grain-free” or “grain-inclusive” as a proxy for recall safety. Check a brand’s individual recall history on FDA.gov instead.
Frequently Asked Questions
Is grain free dog food bad for dogs?
Not inherently. The FDA’s investigation flagged legume-heavy grain-free formulas specifically, not grain-free as a whole category. Most dogs on grain-free diets show no issues, but the DCM question remains open and unresolved. Consult your vet before making a diet change if your dog’s breed carries any known cardiac risk.
What is the safest grain for dogs?
Rice, oats, and barley are all well tolerated by the vast majority of dogs. True grain allergies are rare, and no single grain is considered inherently risky for healthy dogs.
How do I know if my dog has a grain allergy?
The only reliable method is a vet-supervised elimination diet. Symptoms like itching or digestive upset are more often caused by an animal protein, such as beef, chicken, or dairy, than by grain. Consult your vet before starting an elimination trial.
Is grain free more expensive than grain-inclusive?
Not always. In this comparison, grain-free products ranged from $1.25 to $1.63 a day, while grain-inclusive products ranged from $0.87 to $2.07 a day. Price tier matters more than grain status.
Can I switch my dog from grain free to grain inclusive safely?
Yes, with a gradual transition over 7 to 10 days, mixing increasing amounts of the new food with the old to avoid digestive upset. Consult your vet if your dog has any existing digestive sensitivity.
Final Recommendation
For most healthy adult dogs, Purina Pro Plan Complete Essentials Chicken & Rice is the strongest overall pick. It’s feeding-trial validated, reasonably priced at $1.24 a day, and free of the legume-heavy pattern the FDA has been investigating.
If you have a specific reason to go grain-free, such as a vet-diagnosed allergy or a directed therapeutic need, Taste of the Wild High Prairie offers the best value among grain-free options at $1.25 a day.
If budget is the deciding factor and your dog has no special dietary needs, Purina ONE Chicken & Rice costs less than a dollar a day and still carries feeding-trial AAFCO validation.
