Raw Diet for Cats: The Real Risks, and the Gaps That Hurt Most

Raw feeding is not automatically better or worse than commercial food — it is a higher-variance choice, where a well-formulated raw diet can be excellent and an improvised one can cripple a kitten in three months. The three risks that actually cause harm are bacterial contamination, nutrient gaps (calcium, taurine, vitamin D, thiamine), and zoonotic infection of the household. "Raw" and "natural" are not nutritional claims; a bowl of chicken necks with an egg on top is a deficient diet, however good the chicken.

Freezing does not sterilise anything

Raw poultry and raw pork routinely carry Salmonella, Campylobacter, Listeria and E. coli. A domestic freezer at −18°C stops them multiplying; it does not kill them or reduce the dose. Only heat does that: a core temperature of 74°C for a few seconds. So the bacteria arrive in the bowl intact, and the cat sheds them in stool for up to six weeks after a single contaminated meal.

Surveys of commercially sold raw pet food have repeatedly found Salmonella and Listeria in a substantial minority of samples, including products labelled "human-grade". The cat often tolerates this, which is what makes the risk easy to ignore until a person in the house is affected.

Calcium and phosphorus: the gap that breaks bones

Muscle meat has a calcium-to-phosphorus ratio of roughly 1:20, and a diet built on it drives the body to strip calcium from bone to handle the phosphorus load. The target for a complete diet is 1.1–1.3:1. In kittens aged four to six months this produces nutritional secondary hyperparathyroidism within eight to twelve weeks: lameness, rubbery bones, fractures on a normal jump, and sometimes permanent deformity.

The usual fix is raw meaty bone at roughly 10% of the ration, or a measured calcium supplement. Bone content varies by cut and by species, and a recipe that is 8% bone in one batch and 16% in the next will alternate between deficiency and chalky constipation. This is the single strongest argument for a formulated recipe from a board-certified veterinary nutritionist rather than a blog.

Taurine: heat isn't the only thing that destroys it

Cats cannot synthesise taurine and must get 0.1% of dry matter daily; most complete foods declare 0.15–0.25%. Raw feeders often assume freezing preserves everything, but grinding exposes far more surface area to oxidation, and repeated freeze-thaw cycles degrade taurine further. Dark meat and heart are the richest sources; breast is poor.

Deficiency shows as dilated cardiomyopathy and retinal degeneration. Vision loss is largely irreversible after six to twelve months; the heart changes often reverse within weeks of supplementation, so a new murmur on a raw diet means checking taurine first.

Vitamins A, D and B1, plus iodine

Liver is the usual vehicle for vitamin A, and more is not better: hypervitaminosis A causes exostosis of the cervical vertebrae, neck stiffness and lameness, and it takes months to develop. Keep liver at roughly 5% of weekly calories and do not add cod liver oil on top of it, because that doubles the vitamin A and adds vitamin D.

Raw fish contains thiaminase, which destroys vitamin B1. A cat fed raw fish several times a week can show neurological signs — head tilt, circling, seizures — within two to four weeks. Raw egg white contains avidin, which binds biotin; eggs are fine cooked. Iodine is the quiet gap: a diet with no thyroid tissue and no iodised source can be short, and the result is goitre or thyroid dysfunction.

Bones: never cooked, never small

Cooked bone splinters into needles and should never be fed, in any form, to any cat. Raw bone is safer but not risk-free: pieces should be larger than the cat's mouth so they are chewed rather than swallowed, and weight-bearing bones from large animals are hard enough to fracture carnassial teeth. Too much bone produces hard, chalky stool and constipation; a cat straining on the litter tray for two days is a vet visit.

Perforation is rare and catastrophic: repeated vomiting after a bone meal is a same-day visit.

Bird flu, tuberculosis and parasites

Since 2023, fatal H5N1 infections in domestic cats have been documented in several countries, with raw poultry and unpasteurised milk as the implicated sources. Cats are unusually susceptible to H5N1 compared with dogs, and the disease is rapid. Mycobacterium bovis in raw milk has caused fatal feline tuberculosis. Some veterinary bodies now advise against raw poultry for this reason alone.

Freezing helps only with parasites: Toxoplasma cysts and tapeworm larvae die after seven days at −20°C, colder than most kitchen freezers reach.

The household is exposed too

Children under five, pregnant women and immunocompromised adults are the ones who get sick from a contaminated sink, not the cat. Practical measures: a separate cutting board and knife used only for raw pet food, washing with hot soapy water and then a 1:32 bleach solution with five minutes of contact time, defrosting in a sealed container on the bottom shelf of the fridge, and feeding in a bowl that is washed immediately after.

Litter boxes need scooping daily with gloves, away from food preparation areas. A cat shedding Salmonella for six weeks looks perfectly well.

If you feed raw anyway, hold this line

Use a commercial raw product that carries a complete-and-balanced statement, or a recipe from a board-certified veterinary nutritionist that specifies grams of muscle, organ and bone plus a measured supplement. Weigh the cat monthly, recheck bloodwork yearly, and stop if the cat is a kitten, pregnant, or living with an immunocompromised person.

Never feed these raw: raw poultry during an H5N1 outbreak area, raw fish in quantity, raw egg white, raw pork, any cooked bone, and any "bone-in" cut small enough to swallow whole. An unbalanced homemade diet does silent damage for months: bone pain in a kitten, a heart murmur in an adult. For the parallel list of human foods that are dangerous regardless of preparation, see our food safety guides.

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