The 5 Worst Ingredients Hidden in Cheap Dog Treats (And What to Look For Instead)

Key Takeaways

• Many popular dog treats contain artificial preservatives like BHA, BHT, and ethoxyquin — chemicals linked to long-term health concerns that are worth avoiding.

• Fillers like corn, wheat, and soy offer little nutritional value and can trigger sensitivities in some dogs, even when listed as primary ingredients.

• "FEDIAF compliant" on a label doesn't guarantee nutritional quality — compliance with labelling standards is not the same as feeding your dog well.

• Freeze-dried raw treats preserve nutrients, enzymes, and bioavailability in ways that conventional baking and extrusion can't match — making them one of the strongest choices available.

• Short, recognisable ingredient lists are one of the most reliable signals of a genuinely healthy treat — and the grain-free question is more nuanced than most packaging lets on.

Most dog owners put real thought into what goes in their dog's bowl at mealtime. But treats? Those often get a pass. They're small, they're occasional, and the packaging usually looks wholesome enough. The problem is that what's hidden inside those treats can quietly work against your dog's health over time — and the ingredient lists on many popular brands read more like a chemistry textbook than a food label.

This guide breaks down the five most harmful ingredients commonly found in dog treats, explains what those ingredients actually do inside your dog's body, and shows what genuinely healthy alternatives look like — so the next time a treat gets tossed across the room, it's doing something good.

Most Dog Treats Are Hiding Something

The dog treat market is enormous, and most of it runs on convenience and clever branding. Words like "natural," "wholesome," and "vet-recommended" appear on packaging, yet these terms carry varying degrees of regulatory oversight — "natural" has a definition under EU and UK feed regulations, while terms like "wholesome" and "vet-recommended" are often used with far less scrutiny. Meanwhile, the actual ingredient list — buried in small print on the back — often tells a very different story.

It's not always dramatic. There's no single ingredient that will harm a dog overnight. The concern is cumulative: low-quality treats fed regularly, over months and years, can contribute to chronic inflammation, digestive issues, skin problems, weight gain, and more. Dogs can't read labels. Their owners have to.

Knowing what to look for — and what to avoid — is one of the most practical things a dog owner can do. The Pawcredible Raw Fusion Treat Pouch is one example of a treat built around transparency: a short ingredient list anchored by 75% real chicken, functional superfoods, and zero artificial additives. That kind of standard is a useful benchmark when evaluating other products on the market.

The five ingredients below are among the most commonly flagged by veterinary nutritionists and pet food safety advocates — and they're found in far more treats than most people realise.

5 Harmful Ingredients to Avoid

1. Artificial Preservatives (BHA, BHT & Ethoxyquin)

BHA (butylated hydroxyanisole), BHT (butylated hydroxytoluene), and ethoxyquin are synthetic antioxidants used to extend shelf life in processed pet foods and treats. They're effective at preventing fat from going rancid — and that's essentially the only thing they're good for.

The European Food Safety Authority (EFSA) has raised concerns about BHA and BHT in its risk assessments, identifying them as substances warranting caution due to their potential genotoxic and carcinogenic properties. While UK and EU regulations permit their use in pet food and animal feed at specified maximum levels, permitted doesn't mean ideal. These chemicals accumulate in fatty tissue with repeated exposure, and their long-term effects in dogs haven't been as thoroughly studied as many owners assume.

Ethoxyquin carries its own controversy. Originally developed as a pesticide and rubber stabiliser, it found its way into pet food as a preservative. Significantly, the EU suspended the authorisation of ethoxyquin as a feed additive in 2017 under Commission Implementing Regulation (EU) 2017/962, citing unresolved safety concerns — yet it can still appear in some imported fish meal ingredients, meaning it may be present without being listed directly on the label.

What makes these preservatives especially deceptive is that they don't always appear under their own names. Ethoxyquin, for example, is sometimes introduced through preserved fish meal — meaning it can be present without being listed directly on the label.

What to look for instead: Mixed tocopherols (a form of Vitamin E), citric acid, and rosemary extract are all effective natural preservatives with well-established safety profiles. When a label lists these, it's a good sign the manufacturer is prioritising quality over cost-cutting.

2. Low-Value Fillers: Corn, Wheat & Soy — A Sensitivity Risk for Some Dogs

Fillers are ingredients that add bulk and calories without contributing meaningful nutrition. Corn, wheat, and soy are the most common in commercial dog treats, frequently appearing in the top five ingredients — which means they make up a large portion of what the dog is actually eating.

These ingredients aren't universally toxic, and it's worth being accurate here: many dogs tolerate them without obvious issue. But they offer very little nutritional upside, and for a significant number of dogs, they're a genuine problem. Corn and wheat are among the most common triggers for food sensitivities in dogs, showing up as itchy skin, chronic ear infections, loose stools, and excessive paw licking. Soy can interfere with thyroid function and hormone balance in some dogs due to its phytoestrogen content.

Beyond sensitivities, the deeper issue is displacement. When a treat is 40% corn starch, that's 40% of the treat that isn't real protein, healthy fat, or a functional ingredient doing something useful. Dogs thrive on animal-based protein and fat as the foundation of their diet. Packing a treat with cheap plant starches to hit a calorie count is a shortcut that benefits the manufacturer far more than it benefits the dog.

If fillers appear in the first three ingredients of a treat, it's a reasonable signal to keep looking.

3. Vague or Unspecified By-Products (Not All By-Products Are Equal)

By-products have a complicated reputation — and the reality is more nuanced than a blanket "avoid by-products" rule. Animal by-products can include organ meats like liver, kidney, and lung, which are actually nutrient-dense and highly digestible. In a fresh, raw context, these are genuinely valuable parts of an animal.

The problem is vague labelling. "Meat by-products" or "animal by-products" without any species identified could legally include material from multiple sources of inconsistent and unverified quality. The lack of specificity is the red flag — not by-products as a category.

When a label reads "chicken liver" or "beef kidney," that's a traceable, identifiable ingredient. When it reads "meat meal" or "animal digest," the source is unclear, the quality is harder to verify, and the nutritional contribution becomes unpredictable. Processing methods for these rendered by-products can also destroy nutrients that would otherwise be beneficial.

The rule of thumb: Look for named proteins in named forms. "Deboned chicken" is informative. "Poultry by-product meal" is not. The more specific the label, the more confidence a dog owner can have in what's actually inside.

4. Artificial Colours & Flavours

Here's a question worth asking: who are the artificial colours in dog treats actually for? Dogs don't care if a treat is red, yellow, or shaped like a cartoon bone. The colours are there to appeal to the human reaching for the bag at the store — a pure marketing decision with zero nutritional benefit and potential health downsides.

Common artificial dyes such as Allura Red (E129), Tartrazine (E102), and Indigo Carmine (E132) have been associated with hypersensitivity reactions and are subject to ongoing research regarding behavioural effects. Several of these are already restricted or carry mandatory warning labels in EU human food products — yet they can still appear in pet food without the same level of scrutiny. There is simply no reason to accept them when natural alternatives perform just as well.

Artificial flavours tell a similar story. When a treat needs synthetic flavour enhancement to be palatable, it often means the underlying protein quality is low. High-quality meat already tastes good to dogs — it doesn't need help. Artificial flavour masking is frequently a sign that the real ingredients aren't doing enough work on their own.

Natural flavouring from real meat, bone broth, or whole food ingredients is a far better standard. If a treat smells like food rather than a chemical approximation of food, that's usually a sign the ingredients are what they should be.

5. Propylene Glycol: Permitted in Dog Food, But Worth Avoiding

Propylene glycol is a humectant — it keeps soft and semi-moist treats from drying out, giving them that chewy texture many dogs enjoy. UK and EU regulations permit its use in dog food, and it's often cited as safe at the concentrations used in commercial products.

That said, it's a substance with a complicated history in pet food. Propylene glycol is already prohibited in cat food under EU Regulation (EC) No 767/2009 — a restriction that continues to apply in the UK post-Brexit — after studies showed it caused oxidative damage to red blood cells in cats. The threshold for harm in dogs is considered higher, but the same metabolic concern exists in principle.

More practically: it's a synthetic industrial compound used in antifreeze and brake fluid (albeit food-grade versions). Its sole purpose in a treat is texture — a cosmetic function that tells you nothing about nutritional quality. Treats that achieve moisture and palatability through whole food ingredients like natural broth or fruit purees don't need propylene glycol at all.

When a treat lists it, it's worth asking what it's replacing. Often, the answer is real ingredients.

Why "FEDIAF Compliant" Isn't Enough

FEDIAF Standards Apply to Complete Foods, Not Always Treats

The European Pet Food Industry Federation (FEDIAF) publishes the nutritional guidelines most commonly referenced as a marker of pet food quality in the UK and across Europe. In the UK, the Pet Food Manufacturers' Association (PFMA) follows these guidelines and represents the domestic industry. When a bag of kibble states it "meets FEDIAF nutritional guidelines," it means the food has been formulated to provide complete and balanced nutrition for a dog's life stage.

Treats are a different category entirely. Many treats are not subject to the same complete-and-balanced requirements, because they're not classified as a dog's primary nutrition source. This means a treat can carry compliant labelling while still containing ingredients that a nutritionally informed owner would immediately reject. Compliance is a floor — a baseline legal requirement — not a marker of quality.

A FEDIAF or PFMA-aligned label tells you a product was made according to rules. It doesn't tell you whether those rules produced something genuinely nourishing.

Labelling Compliance ≠ Nutritional Quality

Pet food labelling rules under EU Regulation (EC) No 767/2009 — retained in UK law post-Brexit — require that ingredients be listed in descending order by weight before processing. This sounds helpful until you realise that many manufacturers game the system through a practice called ingredient splitting — dividing a single ingredient (like corn) into multiple sub-forms (corn flour, corn starch, corn gluten meal) so each appears lower on the list individually, even though their combined weight would place corn at the top.

Labels can also use terms like "with real chicken" when chicken is present in only minimal amounts. Under UK and EU feed labelling rules, specific percentage thresholds apply to different descriptor terms — "with," "rich in," "high in" each carry different minimum requirements — but the practical effect is the same: less of the named ingredient than the front-of-pack language implies. This is legal. It's also designed to mislead.

Reading ingredient lists critically — looking at the first five ingredients, watching for ingredient splitting, and noting whether protein sources are named and specific — gives a much clearer picture of what a treat actually is than any marketing claim on the front of the package.

What Healthy Treats Actually Look Like

Whole, Identifiable Protein Sources

The single most reliable indicator of a quality treat is a named, whole protein source in the first ingredient position. "Deboned chicken," "wild-caught salmon," "grass-fed beef" — these are informative, traceable, and nutritionally meaningful. Dogs have a strong biological need for high-quality animal protein, which provides the amino acids required for muscle maintenance, immune function, coat health, and energy.

Protein content alone isn't the full story. Bioavailability matters: protein from whole muscle meat is more readily absorbed and utilised than protein from rendered meal or plant-based sources. A treat with 20% protein from real chicken delivers more functional nutrition than one with 25% protein from corn gluten meal and unnamed meat meal.

Organ meats — when named and sourced transparently — are also worth welcoming. Chicken liver is one of the most nutrient-dense ingredients that can appear in a dog treat: rich in Vitamin A, B vitamins, iron, and copper in forms that are highly bioavailable. The key is specificity. Named organs from named animals are a bonus; vague "by-products" are not.

Natural Preservatives That Won't Harm

Preserving a treat without synthetic chemicals is entirely achievable — and many quality manufacturers do it routinely. The most common and well-regarded natural preservatives are:

• Mixed tocopherols — a naturally derived form of Vitamin E that prevents oxidation without introducing synthetic compounds. It's effective, safe, and adds a minor nutritional benefit.

• Citric acid — found naturally in citrus fruits, it works as both a preservative and a mild flavour agent, with no known safety concerns at the levels used in pet food.

• Rosemary extract — a plant-based antioxidant that inhibits fat rancidity and has been used in food preservation for decades with a clean safety record.

These ingredients achieve the same shelf-life goals as BHA or BHT without the associated risks. Their presence on a label is a clear positive signal. Their absence — replaced by synthetic alternatives — is a reason to pause.

Functional Superfoods With Real Benefits

The best treats don't just avoid harmful ingredients — they actively contribute to a dog's health. A growing category of products incorporates functional ingredients that support specific biological systems, going beyond basic nutrition into targeted wellness.

Ingredients worth welcoming in a quality treat include:

• Pumpkin — a natural source of soluble fibre that supports healthy digestion and regulates stool consistency.

• Cranberries — contain compounds that support urinary tract health and provide antioxidant activity.

• Turmeric — curcumin, the active compound in turmeric, has well-documented anti-inflammatory properties relevant to joint health and immune response.

• Seaweed (kelp) — a rich natural source of iodine, which supports thyroid function, along with a spectrum of trace minerals not easily obtained from meat alone.

• Prebiotics — fermentable fibres that feed beneficial gut bacteria, supporting digestion, immune function, and even mood regulation through the gut-brain axis.

These aren't marketing buzzwords when they appear in meaningful concentrations. They're ingredients with real, documented mechanisms of action. A treat that combines quality protein with several of these functional additions is doing something genuinely useful every time it's given.

Why Freeze-Dried Raw Treats Win

Nutrients Locked In, Not Cooked Out

Most commercial dog treats are produced through high-heat baking or extrusion — processes that apply temperatures well above 150°C to shape and preserve the final product. These temperatures are effective for killing pathogens and achieving consistent texture, but they also degrade heat-sensitive nutrients in the process.

Enzymes, which play a significant role in digestion and metabolic function, are almost entirely denatured at cooking temperatures. Many B vitamins and omega fatty acids are similarly degraded. To compensate, manufacturers add synthetic vitamins back in after processing — a workaround that addresses the symptom but not the underlying problem of nutritional loss.

Freeze-drying works differently. The process removes moisture through sublimation — converting ice directly to vapour under low pressure and low temperature — leaving the food's structural integrity, nutrient profile, and enzymatic activity largely intact. What comes out of a freeze-dryer is essentially raw food in a shelf-stable, lightweight form. No heat damage. No need for artificial preservatives. No synthetic vitamins bolted on after the fact.