Raw or kibble for a puppy? What the UK evidence actually says

Ask this question anywhere online and you get two certainties shouting at each other. One side says kibble is processed rubbish and dogs evolved to eat meat. The other says raw feeding is a public health hazard dressed up as nature.

Both are overstating it, and the actual evidence is more interesting than either. There is now a large, UK-specific body of data on what is in raw pet food, and it is genuinely alarming. There is also a smaller, weaker but real body of evidence that raw does some things well. Almost nobody presents both.

This page does, and then tells you what we would feed a puppy.

The number that dominates the debate

In February 2026 the Food Standards Agency published a survey of raw dog and cat food bought from UK retail. It covered 380 samples across 50 brands, collected over a year.

Pathogenic bacteria turned up in 35% of samples. Salmonella in 20.8%, Campylobacter in 13.7%, culture-confirmed shiga-toxin-producing E. coli in 11.8%. Around a tenth carried MRSA. Nearly a fifth carried ESBL-producing E. coli — the kind that resists the antibiotics vets reach for first.

The most damning line is the plainest one: 28.7% of packs failed the legal standard. UK law, carried over from EU Regulation 142/2011, requires absence of Salmonella in 25g and caps Enterobacteriaceae at 5,000 per gram. Roughly one pack in three on British shelves did not meet it. A separate detail from the same survey: 8% of packs leaked while defrosting.

That is not a campaign group’s figure. It is the food regulator’s.

What it does to the dog, and to the household

Two UK studies matter here, and one of them is about puppies specifically.

The puppy one is from Bristol, published in 2022. It followed 223 puppies at 16 weeks old and found that raw feeding was associated with carrying antibiotic-resistant E. coli in their faeces — and that the carriage appeared regardless of how long the puppy had been raw-fed. A larger 2024 UK study of 432 dogs put numbers on the adult picture: ESBL-producing E. coli in 24.4% of raw-fed dogs against 1.7% of conventionally fed ones.

Then there is the human case. In 2017, four people in the UK were infected with the same strain of E. coli O157:H7. Three had been exposed to dogs fed raw tripe; two of those had tripe from the same supplier. One of the four developed haemolytic uraemic syndrome and died. Investigators could not recover the outbreak strain from product and stopped short of proving the link, concluding raw pet food was “a potential source.”

Recalls happen too. Rhondda Raw pulled a beef mince in October 2025 for Salmonella; Dogs Choice UK pulled three frozen lines in 2022 for the same. A commercial raw venison diet was associated with an outbreak of Mycobacterium bovis in UK cats in 2018.

For balance, the raw-feeding industry’s counter is worth knowing: the Raw Feeding Veterinary Society points to APHA figures showing recorded Salmonella isolations from raw pet foods fell 29% between 2022 and 2024 while sales rose, and argues the FSA report conflates detection with quantified risk. That is a fair criticism of how the headline reads. It does not make 28.7% legal non-compliance acceptable.

The calcium problem, which is the puppy-specific one

Everything above applies to any dog. This bit applies only to puppies, and it is the reason we are firmer here than we would be about an adult.

A puppy’s small intestine absorbs about 70% of dietary calcium passively in the first six months or so. It cannot regulate the intake down. Feed a large-breed puppy too much calcium and the excess goes in whether the skeleton wants it or not, and the association is with osteochondrosis, panosteitis, wobbler syndrome and radius curvus — collectively developmental orthopaedic disease.

FEDIAF sets the window tightly for early growth: 1.0 to 1.6 grams of calcium per 100g of dry matter, phosphorus 0.9 to 1.6, and a maximum calcium-to-phosphorus ratio of 1.6:1. These early-growth limits apply to breeds maturing over 15kg until around six months.

A bone-heavy home-mixed raw diet pushes calcium straight through the ceiling. A meat-only one with no bone goes the other way and causes nutritional secondary hyperparathyroidism. Hitting the window by feel is not realistic, and the numbers suggest people do not manage it: the Dog Aging Project analysed 1,726 homemade dog food formulations in 2025 and found 94% were not nutritionally complete, with calcium and phosphate imbalance among the named problems. That study covered homemade diets generally, cooked as well as raw, so do not read it as a raw statistic — but it is the best available answer to “how hard can it be.”

Complete commercial raw is a different proposition from home-mixed. It is formulated to FEDIAF and, if the brand is doing its job, tested. If you are going to feed raw, feed that, and check the pack says “complete” for growth rather than “complementary.”

What raw actually does well

A 2025 review in Animals graded the claims by evidence quality, and its own summary is blunt: most owner claims about raw “lack scientific substantiation.” But it does not find nothing, and the honest version is this.

Digestibility has the best support, with one study reporting apparent digestibility of 95.7% against 57.1%. The caveat is large — the raw and control diets differed in ingredients, not only in being raw — but the direction is consistent.

Stool quality and coat condition show up repeatedly in small studies. Both are the sort of thing owners notice, which is probably why raw feeders are so confident.

Dental calculus is the cleanest result in the whole literature. A 2016 Australian trial gave beagles raw cortical bone and measured calculus coverage down 70.6% by day 12; spongy bone reached 87.8% by day 20. No fractures or obstructions in that trial. The counterweight is a later study that did find dental injuries from autoclaved beef bones, and PDSA’s standing warning about obstruction and splintering.

And the one that should interest puppy owners most: a 2021 Helsinki study of 4,022 dogs found that puppies fed at least 20% raw food between weaning and six months showed significantly fewer allergy and atopy skin signs as adults. Raw tripe and raw organ meats were the specific protective items. Before anyone gets excited: it is owner-reported, retrospective and observational, the authors say plainly it “does not prove” causation, and it has been publicly contested in the journal’s own letters pages. It is a hypothesis worth testing, not a reason to feed raw.

What has no good evidence behind it: that raw is what dogs evolved to eat and therefore healthier — dogs carry adaptations for dietary starch that wolves do not; that raw prevents disease generally; that raw extends life; and that rotating proteins makes a diet self-balancing.

What it costs, honestly

A 10kg puppy, fed raw at 5% of bodyweight, eats 500g a day.

Food	Per kg	Per day for that puppy
Skinner’s Field & Trial Puppy, 15kg	£2.13	£0.35–£0.55
Harringtons Puppy, 10kg	£2.29	£0.38–£0.60
Durham Animal Feeds minces, 454g	£3.19–£4.52	£1.60–£2.26
Paleo Ridge Essentials, 500g	£4.98	£2.49
Royal Canin Medium Puppy, 10kg	£5.10	~£1.22–£1.27
Natures Menu raw puppy nuggets, 1kg	£6.99	£3.50

The kibble figures come from each brand’s own feeding chart for a puppy heading for a 10–20kg adult. Raw typically lands at three to six times the cost of mid-range kibble, and one and a half to two and a half times premium kibble.

Two things that never appear in the brochure. First, introductory pricing: raw brands routinely discount the first box by up to 40%, so the figure you sign up on is not the figure you pay. Second, the freezer. Bella & Duke’s own guide puts a 12kg order at roughly a drawer and a half. A 10kg puppy eating 500g a day gets through about 15kg a month — two full drawers of a standard British upright freezer, permanently, forever. Most households who commit to raw end up buying a second freezer, and that capital cost belongs in the comparison.

The 5% rule is a rule of thumb, not a measurement

Raw brands size portions as a percentage of bodyweight, and they do not agree with each other. Bella & Duke says 4–10% depending on age. Paleo Ridge says 5–6% flat for puppies. That spread is itself the tell.

The problem is that a percentage of bodyweight ignores the energy density of the food. An 80/10/10 mince and a lean turkey mince are not the same number of calories, so the same 5% delivers different energy. FEDIAF sizes rations by kilocalories, derived from metabolic bodyweight, for exactly this reason.

Worse for puppies, the rule is keyed to current weight, so a puppy who is already carrying too much gets fed more — which compounds the error at precisely the age when controlled growth is what you are protecting. Paleo Ridge implicitly concedes the point by anchoring its adult figure to ideal weight while leaving the puppy figure on current weight.

If you feed raw, work from calories and body condition, not a percentage. Our feeding guide does the arithmetic.

If you are feeding raw anyway, do these six things

None of this is optional, and all of it is FSA guidance rather than our opinion.

Freeze it until needed and label it. Keep it on the lowest shelf, away from human food. Defrost away from food preparation surfaces. Use dedicated utensils and containers — never the ones you use for your own food. Clean and disinfect every surface it touched, including the bowl. Wash your hands with soap and hot water immediately afterwards, every time.

And the one people skip: children under five should not touch or handle raw pet food. Once thawed it keeps two to four days depending on the product — Bella & Duke says three to four, Paleo Ridge up to three, Natural Instinct four but only two for offal and some fish. Check the pack rather than applying one rule.

Who should not read this as a warning

If you have an adult dog thriving on commercial complete raw, nothing here says stop. The pathogen data is about risk exposure, not about your dog being ill, and the handling rules exist because the risk is manageable.

If you want raw for a puppy and your household has no young children, nobody immunocompromised, a spare freezer and the discipline for the hygiene routine, a complete commercial raw formulated for growth is a defensible choice. Say so to your vet rather than not mentioning it.

What is not defensible is mixing your own for a large-breed puppy off a recipe from a forum. That is the version with a real, documented, skeletal consequence, and it is the one the evidence is clearest about.

What to do next

If the cost side is what is driving the decision, what it actually costs to feed a dog for a week has a calculator that takes your dog’s weight and the price on the bag you actually buy.

And if you are weighing raw against the fresh and tailored subscription companies rather than against kibble, the subscription comparison covers what those cost once the puppy grows, which is the part the signup quote leaves out.

---

Contamination figures are from the Food Standards Agency’s survey of raw dog and cat food on UK retail sale, published February 2026; the antimicrobial resistance figures from University of Bristol (2022) and a 2024 UK cohort study; the 2017 STEC cluster from Epidemiology and Infection. Nutrient limits are FEDIAF’s 2024 Nutritional Guidelines — FEDIAF issued 2025 guidelines and the figures should be re-checked against those. Evidence grading of the claims for raw follows a 2025 review in Animals. Prices were checked at UK retailers in September 2026 and move often; the Royal Canin price was rechecked at zooplus in October 2026 (£50.99 for 10kg), while the Skinner’s price comes from a different retailer and was not reconfirmed. Nothing here is veterinary advice — diet choice for a growing puppy, and especially a large-breed one, is a conversation for your vet.