Grain-Free Dog Food, Treats and DCM: What Owners Should Know

Grain-Free Dog Food, Treats and DCM: What Dog Owners Actually Need to Know

If you have seen headlines linking grain-free dog food to heart disease, and you have wondered whether the food or treats in your kitchen are part of the problem, you are not overreacting.

DCM is a serious condition, and dog owners are right to take it seriously.

But the headlines flattened a complicated story into a slogan. The investigation was serious enough to deserve attention, but the public story often became stronger than the evidence.

On a dog food or treat label, “grain-free” by itself does not tell you nearly as much as people were told to believe.

This page covers both food and treats, in that order, because that is the order most owners actually worry in. It is not veterinary advice, and it is not a guide to diagnosing or managing heart disease. It is here to help a sensible UK owner read a label with more confidence and less panic.

What is DCM in dogs?

Dilated cardiomyopathy, usually shortened to DCM, is a disease of the heart muscle. The heart becomes enlarged and pumps less effectively. Over time, fluid can build up in the lungs or abdomen, valves can leak, and heart rhythm can be disturbed.

In plain English, the pump becomes baggier and weaker.

Symptoms can include reduced stamina, lethargy, coughing, faster or harder breathing, collapse or fainting, and abdominal swelling. Obvious signs sometimes appear late.^[3]

Some breeds carry higher genetic risk, including Doberman Pinschers, Great Danes, Boxers and Cocker Spaniels. There is also a non-hereditary form that researchers think may be influenced by multiple factors, including diet, individual susceptibility, and how a food is formulated.^[2]^[3]

DCM is not something to self-diagnose from an ingredient list. If your dog has symptoms, known breed risk, or an existing heart condition, that is a vet conversation.

Why did grain-free dog food become linked with DCM?

In July 2018, the US Food and Drug Administration alerted the public to reports of DCM in dogs eating certain pet foods. Many of the reported foods were labelled grain-free and contained high proportions of peas, lentils, other pulses, potatoes or sweet potatoes high on the ingredient list. Grain-containing diets also appeared in the reports.^[1]^[2]

A second update in 2019 named brands and published case data, and that is when the story went public in a big way. From that point, “grain-free” became media shorthand for “risky” in a way the FDA’s own wording never really supported.

The FDA investigated a possible link. It did not prove that grain-free food causes DCM.

What did the FDA actually show?

A more limited picture than many headlines suggested.

The FDA collected adverse event reports, looked at ingredient patterns, and published updates. By 2022, its position had become more careful. The agency stated that legumes had been used in pet foods for years with no evidence they are inherently dangerous, that both grain-free and grain-containing diets had appeared in reports, and that it would not be issuing further routine updates unless meaningful new evidence emerged.^[1]^[2]

A few details matter for reading any “FDA said” headline:

adverse event reports are voluntary
they are a signal, not a count of how many dogs are actually affected
there is no national pet-disease surveillance system equivalent to human public health monitoring
the numbers spiked after public announcements, which is what reporting systems often do when media attention rises
the FDA did not request recalls of foods linked to the DCM investigation because it did not have definitive information showing those diets were inherently unsafe^[2]

So, plainly: the FDA did not prove grain-free caused DCM. It did not prove potatoes caused DCM. It did not prove peas or pulses are dangerous in every recipe.

The issue remains scientifically complex and unresolved. That is not the same thing as “debunked”, but it is also not the same thing as “proven”.

Did the public story go further than the evidence?

Yes.

The public message hardened into “grain-free equals risky” long before the evidence supported that certainty. That was too simple.

Some research suggested that some dogs eating some non-traditional diets showed cardiac changes or improved after a diet change. Other studies, including a 2025 18-month feeding trial, found no clinically significant cardiac deterioration across grain-free and grain-inclusive complete diets, including pulse and potato formulations. The picture is genuinely mixed.^[7]

It is fair to note that commercial conflicts run through evidence on both sides. Major studies have been funded by, or authored by employees of, large pet food companies. That does not prove fraud, and conflicts of interest are not the same as falsified data. But it does mean every published claim deserves to be read carefully and weighed against its design and disclosures.

The flip side is also true. Some critics of the FDA investigation have run their own lawsuits and advocacy campaigns. Those critiques cannot be dismissed just because they came from advocacy, but they are not neutral evidence either.

The sensible conclusion is not “the scare was fake”. The sensible conclusion is that the evidence never justified the certainty the public got.

The problem is not that the FDA investigated. The problem is that a careful investigation became a blunt public slogan.

Confirmed recalls are different from unsettled diet theories

Dog food safety problems can be real and serious. Regulators do find them, and recalls do happen.

Recent examples include aflatoxin contamination, unsafe levels of vitamin D, Salmonella, Listeria, and foreign material such as metal. These are not imaginary problems. They involve specific products, specific batches, test results, contaminant findings, illness reports or recalls.^[8]^[9]^[10]^[11]^[12]^[13]

Those cases are useful for understanding evidence quality, not for attacking any one country’s standards.

When regulators find a concrete food-safety problem, the chain from a specific product problem to a specific risk is usually more direct and traceable.

The grain-free / DCM story was different. It was an investigation into reported associations and possible diet links across many brands, many recipes and many individual dogs, without a single identified mechanism or contaminant.

The DCM investigation was serious, but it was not the same as a recall for a proven contaminant, toxic nutrient level or faulty batch.

Both deserve to be taken seriously. They are not the same kind of finding and they do not carry the same weight of evidence.

What about potatoes and sweet potatoes?

Potatoes and sweet potatoes appeared in some of the reported diets. That made them worth looking at.

They were not proven to cause DCM.

Seeing potato or sweet potato on a label is not the same as seeing evidence of heart-disease risk. What matters more is the amount, the role the ingredient plays in the recipe, and what the whole diet looks like.

A clearly declared potato in a transparent recipe, especially one led by named animal ingredients, is a very different thing from a vague formula where multiple plant fractions dominate the top of the list. The first one gives you something to judge. The second one gives you fog.

Potato on a label is information. It is not a diagnosis.

What about peas, lentils and pulses?

Peas, lentils and pulses appeared in many of the reported diets. That made them worth investigating, and we are not going to pretend otherwise.

But presence in reports is not the same as proof of causation. The FDA itself has said legumes and pulses have been used in pet foods for years with no evidence they are inherently dangerous.^[2]

The questions that matter are the same as for potato.

How much of the recipe is built on these ingredients? Are they sitting near the top of a long plant-heavy list, or are they a smaller, clearly declared part of a recipe led by named animal ingredients? Is the food a complete diet eaten every day, or an occasional treat? Does the individual dog have breed risk or existing heart concerns?

Multiple plant fractions sitting high on a complete food ingredient list is a more serious question than a small, clearly declared ingredient in a treat.

The location and quantity matter as much as the name.

Is grain-free dog food bad?

No, not automatically.

Grain-free is a label claim, not a nutritional verdict. It tells you what is not in a recipe. It does not tell you what is in it, in what proportions, or how well the formula is balanced overall.

A grain-free recipe can be excellent or poor. A grain-inclusive recipe can be excellent or poor. The label slogan does not settle the question.

For complete food, formulation matters more because the food may be eaten every day over long periods.

Grain-free is a poor shortcut for judging a dog food. The full formula matters more.

The evidence never justified turning grain-free, potato or sweet potato into simple villains.

Was this a UK or European issue?

The grain-free / DCM story came mainly from the United States, through an FDA investigation that began in 2018.

UK Pet Food, formerly the PFMA, monitored the issue alongside FEDIAF, the European pet food industry body. UK Pet Food’s public position has been that there was no information to suggest a similar issue in the UK or Europe.^[4]

That is not the same as “the UK proved there is no risk”. It is not “Europe proved grain-free is safe”. It does not mean DCM cannot affect dogs in the UK, and it does not mean diet never matters.

What it does mean is that this was a US adverse-event investigation, not a confirmed UK or European food-safety finding.

The US, UK and EU regulatory frameworks are different. Adverse event reporting in one country, on diets sold under that country’s formulation rules, should not be treated as automatic proof of a problem somewhere else.

UK dog owners should be careful about importing US headlines wholesale.

What should owners look at instead of “grain-free”?

A practical checklist for both food and treats:

Is this a complete food or a treat?
A complete food has to provide the main diet. A treat does not. Do not blur the two.

Are the ingredients clearly named?
“Chicken” is clearer than “meat and animal derivatives”. “Salmon” is more specific than vague wording such as “fish derivatives” or “fish and fish derivatives”.

Is the recipe transparent or vague?
A clear ingredient list with percentages is easier to assess than a long list dominated by category words and hard-to-interpret plant fractions.

How heavily does the recipe rely on pulses, potatoes, sweet potatoes or other plant ingredients?
This matters most when those ingredients sit high in the list of a complete food eaten every day.

What is the main animal protein source?
Is it named? Is it specific? Is the recipe easy to understand?

How much is being fed?
Daily quantity changes the relevance of every ingredient.

Does your dog have symptoms or known breed risk?
That changes the question entirely.

Does the manufacturer explain the recipe clearly?
If you cannot tell what is in the bag, you cannot judge it properly.

Further help:
How to read a dog treat ingredients label
Category labels vs named ingredients
Analytical constituents decoded
What are derivatives in dog treats?

How are treats different from complete food?

Complete dog foods are designed to be eaten every day as the main source of calories, protein, fat, vitamins and minerals. In the UK and Europe, complete pet foods are commonly formulated with FEDIAF nutritional guidance in mind.^[4]^[5]

Treats are different. They are intended as occasional rewards, not as nutritional foundations. Most treats are not formulated to be complete and balanced, and they are not meant to be. The WSAVA nutrition toolkit also notes that products intended for intermittent or complementary feeding should only form a small part of the diet, often around 10% or less.^[6]

That is why complete food is the bigger question on DCM. The investigation focused overwhelmingly on dogs’ principal diets, fed every day, often for months or years. Occasional treats fed in small quantities are simply not the same case.

A complete food eaten every day matters more than an occasional treat, but both should be clear enough for owners to judge.

The 10% rule is a useful rough guide: treats should usually make up no more than around 10% of a dog’s daily calories. If treats are creeping above that, or being used as toppers or pseudo-meals, they stop being occasional and start being part of the main diet picture.

Further help:
Treat calories and the 10% rule
Grain and cereal-heavy dog treats

How Bounce & Bella thinks about grain-free food and treats

Bounce & Bella foods and treats are grain-free, so this is a fair question for us to answer clearly.

Grain-free is a recipe choice. It is not a medical promise.

We do not claim our foods or treats prevent DCM. We do not claim they are suitable for dogs with heart disease. We do not claim potato or sweet potato is harmless in every diet, and we are not going to.

What we do believe is that labels should be clear enough for owners to judge the recipe themselves. That means named ingredients, declared percentages, and recipes written in plain enough language to mean something.

For complete foods, the same principle applies: judge the full recipe, the declared ingredients and the feeding context, not the grain-free claim on its own.

If a recipe is so vague that you cannot tell what is in it, that is a problem regardless of whether the food is grain-free or grain-inclusive.

A few examples from our treat range show what clearly named recipes look like. These are examples of transparent labelling, not medical claims:

Pure Chicken Nibbles: one ingredient, chicken.
Venison Strips: 100% venison.
Natural Beef Dog Chews: 100% air-dried beef.
Whitefish and Potato Cookies: 85% whitefish and 15% potato.

The point is not that any of these products are “safe for DCM” or suitable for a dog with a heart condition. The point is that the ingredients are written plainly enough for owners to read them in context.

Concerns about symptoms, breed risk, or diagnosed heart disease belong with a vet. Always.

A simple comparison table

Question	Better way to think about it
Is it grain-free?	Useful starting point, not the whole answer.
Is it a complete food or a treat?	Complete food matters more because it may be eaten every day over long periods.
Does it contain potato or sweet potato?	Look at amount, role, and the whole recipe.
Are peas, pulses or plant fractions high in the list?	Worth asking about, but not proof of harm.
Are the ingredients clearly named?	Clear recipes are easier to judge.
How much is being fed?	Amount changes relevance.
Does the dog have symptoms or breed risk?	Vet advice matters more than label-reading.

When should owners speak to a vet?

A label-reading page is not the right place to make heart-health decisions.

Speak to your vet if any of the following apply:

new or persistent coughing
reduced stamina or unusual tiredness
faster or harder breathing
collapse or fainting
abdominal swelling
a breed with known higher DCM risk
an existing heart diagnosis
worry about your dog’s main diet rather than a single ingredient
any ongoing concern that is not going away

A vet can examine your dog, run the tests that actually answer the question, and give advice based on your specific dog rather than a general article.

Bottom line

DCM is serious, and owner worry about it is reasonable.

But the public story became stronger than the evidence supported.

The FDA investigated a possible link. It did not prove that grain-free food causes DCM. It did not prove potato or sweet potato causes DCM. It did not prove peas or pulses are dangerous in every recipe.

The evidence never justified turning grain-free, potato or sweet potato into simple villains.

What does matter is what the whole recipe looks like, how clearly it is written, how much your dog is eating every day, what the main diet looks like, and whether your dog has symptoms, breed risk or an existing heart diagnosis.

Complete food matters more than treats. Recipe clarity, full formulation and feeding amount matter more than any single buzzword on the front of a bag.

If your dog is healthy and the food and treats you choose are clearly written, you are not failing them by reading past the slogan.

If anything about your dog’s health is worrying you, that is a vet conversation, not a label one.

FAQ

Is grain-free dog food linked to DCM?

It was reported as part of a US FDA investigation that began in 2018. Many of the reported diets were grain-free, but grain-containing diets appeared in the reports too. The investigation found an association in reports, not a proven cause. The issue remains scientifically unresolved.

Does grain-free dog food cause DCM?

The evidence has not established that grain-free food, by itself, causes DCM. The FDA did not prove that, and later studies have produced mixed results. Grain-free is a label claim, not a nutritional verdict. The full formula and feeding context matter more.

Are potatoes or sweet potatoes dangerous in dog food?

The evidence has not established that potato or sweet potato causes DCM. They appeared in some reported diets, but appearing in reports is not proof of harm.

Seeing potato or sweet potato on a label is not the same as seeing evidence of heart-disease risk. Amount, role in the recipe, and whole-diet context matter more.

Are peas and lentils dangerous in dog food?

Pulses appeared in many of the reported diets, which made them worth investigating. They have also been used in pet foods for years with no evidence they are inherently dangerous.

Whether they matter in a specific recipe depends on quantity, position on the ingredient list, and whether the food is the main diet or an occasional treat.

Is grain-inclusive dog food safer?

Not automatically. Grain-containing diets have also appeared in DCM reports.

The label slogan does not settle the question either way. Formula quality, ingredient clarity, and how a recipe is built matter more than whether grains are present.

Are grain-free treats a DCM risk?

The main evidence on diet-associated DCM concerns dogs’ principal diets eaten every day, not occasional treats fed in small amounts.

Treats become more relevant if they are heavily overfed or used as meal replacements. For most owners, occasional treats fed sensibly are not the question to lose sleep over.

When should I ask my vet about DCM?

Ask your vet if your dog has coughing, reduced stamina, breathing changes, fainting, abdominal swelling, a breed with higher DCM risk, an existing heart diagnosis, or any persistent worry about diet or symptoms.

A vet can examine, test and advise. A treat or food page cannot.