The Hidden Risk in the Food Bowl
Campylobacteriosis is the most commonly reported bacterial gastrointestinal infection in humans across the European Union, outpacing even Salmonella. What many pet owners do not realise is that their dog or cat may be a significant source — particularly if fed a raw meat diet. A 2019 study published in One Health found that dogs fed raw meat were over four times more likely to shed Campylobacter in their faeces than those fed commercial diets, with direct implications for household members.
What Is Campylobacter?
Campylobacter is a genus of spiral-shaped, gram-negative bacteria. The species most relevant to companion animals and human health are Campylobacter jejuni and Campylobacter upsaliensis. These bacteria colonise the intestinal tract of a wide range of animals, including poultry, cattle, and pigs — the same animals that feature heavily in raw pet food products.
Many dogs and cats carry Campylobacter without showing any signs of illness. They are, in effect, asymptomatic carriers, shedding the bacteria in their faeces regularly. Puppies and kittens are more likely to develop active diarrhoea. Animals under stress, recently rehomed, or immunocompromised are also at higher risk of symptomatic infection.
Symptoms in Dogs and Cats
When illness does occur, signs typically appear within two to five days of exposure and include:
- Watery or mucoid diarrhoea, sometimes with blood
- Vomiting
- Lethargy and reduced appetite
- Mild fever
- Abdominal cramping — inferred from restlessness or a hunched posture
Symptoms usually resolve within a week in otherwise healthy animals, but young, elderly, or immunocompromised pets may suffer more prolonged or severe illness. Always consult your vet if diarrhoea contains blood or persists beyond 48 hours.
The Raw Feeding Connection
Contamination Rates in Raw Pet Food
Multiple studies examining commercially produced raw pet foods have detected Campylobacter at significant rates. Poultry-based raw products carry the highest contamination burden, reflecting the known prevalence of Campylobacter in broiler chickens. Freezing reduces but does not eliminate bacterial load — thawing followed by handling reintroduces risk to the household environment immediately.
Shedding and Environmental Persistence
A dog that has consumed contaminated raw meat will shed Campylobacter in its faeces for a variable period, sometimes weeks after exposure. During this time, the bacteria can contaminate flooring, hands, clothing, and any surface the dog has contact with. Children who play on the floor, or who have close facial contact with dogs, are at particular risk.
Is Raw Feeding Worth the Risk?
This is a decision for individual owners in consultation with their vet. The claimed nutritional benefits of raw feeding remain largely unsubstantiated by peer-reviewed evidence, while the microbiological risks are well-documented. If you choose to feed raw, strict protocols around handling, storage, and hygiene are non-negotiable.
Zoonotic Transmission to Humans
Human campylobacteriosis causes profuse diarrhoea, abdominal cramps, fever, and nausea, typically lasting three to six days. In rare cases it triggers post-infectious complications including reactive arthritis and Guillain-Barré syndrome, a potentially serious neurological condition. The very young, elderly, and immunocompromised are most at risk of severe outcomes.
Transmission routes from pets to humans include direct contact with faeces, contaminated surfaces, or the pet's coat; handling raw pet food; and indirect contact via shared spaces. The bacteria requires only a very low infectious dose — as few as 500 organisms can cause illness in humans.
Diagnosis and Treatment in Pets
Diagnosis requires faecal culture, as Campylobacter is not visible on standard microscopy and does not appear on routine faecal screens. PCR testing offers greater sensitivity and faster results. Inform your vet if your pet is fed a raw diet or has had contact with other animals, as this guides the diagnostic approach.
Most healthy adult dogs and cats recover without antibiotic treatment. When treatment is required — for severe, prolonged, or complicated cases — erythromycin or azithromycin are commonly used. Fluoroquinolones such as enrofloxacin may be used in some cases, though resistance is an increasing concern. Supportive care including rehydration is essential.
Reducing Risk in the Home
- Wash hands thoroughly with soap and water after handling raw pet food, pet faeces, or the pet itself
- Use separate utensils and preparation surfaces for raw pet food; never use the same chopping board used for human food
- Clean and disinfect pet food bowls after every meal if feeding raw
- Store raw pet food in sealed containers at the bottom of the fridge, away from human food
- Dispose of used packaging immediately and hygienically
- Keep children away from areas where raw food is prepared or where the pet defecates
- Clean up faeces in the garden promptly, wearing disposable gloves
If a household member develops acute diarrhoeal illness and you have a pet on a raw diet, mention this to your GP. The link between pet ownership, raw feeding, and Campylobacter infection is now well-recognised in clinical literature, and knowing the source matters for both treatment and household management.