Are Cats Natural Candidates for Raw Diets?
The logic seems intuitive: cats are obligate carnivores that evolved as hunters, so feeding them raw meat must be closer to their natural diet than highly processed commercial food. This reasoning is popular among raw feeding advocates and has helped drive significant growth in the raw cat food market. However, the fact that cats require animal protein to survive does not make raw feeding inherently safe or nutritionally superior. Understanding why requires looking carefully at both the risks and the specific nutritional vulnerabilities unique to the feline species.
Cats differ from dogs in their nutritional physiology in several important ways. They have a higher protein requirement, they cannot synthesise certain amino acids and vitamins that other species can produce internally, and they have an extremely limited capacity to digest plant-based nutrients. These differences make the consequences of a poorly formulated diet potentially more severe in cats than in other companion animal species.
Bacterial Contamination: The Same Risks as Raw Dog Diets
The bacterial contamination risks associated with raw meat diets apply equally to cats and dogs, and should not be minimised or dismissed on the grounds that cats are "designed" to eat raw meat. The pathogens of concern in raw pet food — Salmonella species, Escherichia coli including Shiga toxin-producing strains, and Listeria monocytogenes — do not discriminate between species. They are equally capable of contaminating raw cat food and causing illness in both the cat and in the humans who share the household.
- Salmonella: cats can become infected following consumption of contaminated raw meat and may shed the organism in their faeces for weeks, even without showing obvious illness. Contact with contaminated faeces, litter trays or surfaces poses a risk to human household members.
- E. coli: haemorrhagic gastroenteritis caused by certain E. coli strains can be severe in cats. STEC (Shiga toxin-producing E. coli) transmission from pets to humans in a household context has been documented in the scientific literature.
- Listeria monocytogenes: this cold-tolerant organism survives refrigeration and is often present in raw meat products. Cats that groom themselves after eating contaminated food spread the organism onto surfaces they come into contact with, including furniture, worktops and human laps.
The zoonotic dimension is particularly important in households that include immunocompromised individuals, elderly people, pregnant women or young children. These groups face a disproportionately higher risk of serious illness from exposure to bacterial pathogens that a healthy adult might clear without significant symptoms.
Cats that eat raw meat and then groom themselves distribute these organisms throughout their coat. When they groom humans, sleep in beds or walk across kitchen surfaces, the opportunity for transmission is real and well documented.
Taurine Deficiency: A Critical Risk in Homemade Raw Diets
Unlike dogs and humans, cats cannot synthesise adequate quantities of the amino acid taurine from dietary precursors. They must consume it directly from animal tissue. Taurine is found primarily in muscle meat — particularly heart tissue — and in seafood. However, the concentration varies considerably between different types of meat, and some preparation methods reduce bioavailability further.
Taurine deficiency in cats causes two well-documented and serious conditions:
- Dilated cardiomyopathy (DCM): taurine is essential for normal cardiac muscle function. Deficiency causes progressive weakening and dilation of the heart muscle, leading to congestive heart failure. The condition can develop over months to years and may not be apparent until the cat is in advanced heart failure.
- Feline central retinal degeneration (FCRD): taurine deficiency causes irreversible degeneration of the photoreceptor cells in the retina, leading to progressive vision loss and ultimately blindness.
Homemade raw diets that are not formulated by a veterinary nutritionist frequently fail to provide adequate taurine. This is because owners typically balance meals based on macronutrient ratios rather than micronutrient analysis. A diet that appears protein-sufficient based on meat percentage may still be taurine-deficient depending on which cuts are used and how the food is stored or prepared.
Commercial raw cat foods labelled as "complete" should contain added taurine, but the bioavailability of supplemental taurine in raw matrices is not always consistent with that in processed foods that have been tested under feeding trials. If feeding a commercial raw diet, ask the manufacturer whether the product has been validated by AAFCO or FEDIAF feeding trials, not simply by nutrient analysis on paper.
Thiamine Deficiency and Fish-Heavy Diets
Another specific nutritional risk in raw cat feeding, particularly when the diet includes large amounts of raw fish, is thiamine (vitamin B1) deficiency. Raw fish contains the enzyme thiaminase, which breaks down thiamine in the digestive tract before it can be absorbed. Thiamine is essential for normal neurological function, and deficiency causes a cluster of serious neurological signs including:
- Incoordination and loss of balance (ataxia)
- Head pressing
- Seizures
- Dilated pupils
- Coma and death if not treated promptly
Cats fed diets high in raw freshwater fish or species known to have high thiaminase activity — such as carp, herring and whitebait — are at particular risk. Cooking deactivates thiaminase, which is one reason that cooked fish-based commercial diets do not carry this risk. Raw fish as a regular dietary component should be avoided unless the diet has been specifically formulated to account for thiaminase activity and supplemented accordingly.
The WSAVA Position on Raw Diets for Cats
The World Small Animal Veterinary Association (WSAVA), whose nutrition guidelines are the international reference standard for companion animal veterinary practice, does not recommend raw animal-based protein diets for cats. The WSAVA's position encompasses the same concerns raised for dogs — bacterial contamination with zoonotic potential, physical injury risk from bones, and the risk of nutritional imbalance — and applies them with equal force to feline patients.
The WSAVA explicitly states that the argument from natural diet — that raw feeding is more appropriate because cats evolved eating raw prey — does not override the evidence base on safety and nutritional adequacy. The conditions under which cats hunt in the wild differ substantially from the conditions under which meat is sourced, stored, thawed and handled in a domestic setting. Wild prey is consumed almost immediately after death, minimising bacterial proliferation. Raw pet food, by contrast, may be thawed and handled over extended periods, providing opportunities for pathogen growth.
What to Do Instead
If you are concerned about the quality or composition of your cat's current diet, the most evidence-based approach is to discuss it with your veterinarian and, if needed, request a referral to a board-certified veterinary nutritionist. A nutritionist can formulate a cooked homemade diet, if that is your preference, that meets all of your cat's nutrient requirements safely, or can recommend commercially processed diets that have passed feeding trials and carry the AAFCO or FEDIAF complete and balanced designation. This approach allows you to address concerns about ingredient quality without exposing your cat or your family to the documented risks of raw feeding.