Short answer: Context-dependent for cats — KibbleIQ grades it C. A small amount of plain cooked liver is one of the most nutritious treats you can offer a cat: it is rich in preformed vitamin A, which cats require from animal sources because they convert plant beta-carotene poorly, plus taurine, vitamin B12 and iron (VCA Animal Hospitals). The catch is that liver is extremely vitamin A dense, and cats are more susceptible to vitamin A poisoning than dogs (VCA Animal Hospitals). Fed frequently or as a diet staple, liver causes hypervitaminosis A — a painful, deforming bone disease with excess bony growths along the neck and spine (Merck Veterinary Manual). Cook it to reduce pathogen risk, keep it to an occasional tiny portion, and never let liver become a large or daily part of the diet.

Why liver is a context-dependent food for cats

Cats are obligate carnivores, and liver delivers several nutrients they specifically depend on from animal tissue. Most importantly, cats need preformed vitamin A (retinol): unlike many species, they cannot efficiently convert the beta-carotene in plants into usable vitamin A, so they rely on animal sources, and liver is one of the richest (VCA Animal Hospitals). Liver also supplies taurine — an amino acid cats must obtain from the diet because they make too little themselves, and which is essential for heart and eye health — along with vitamin B12, iron and copper. In a small cooked portion, those nutrients make liver a genuinely valuable, highly palatable treat for most healthy cats.

The problem is that the very nutrient that makes liver valuable is also what makes it risky. Liver is one of the most vitamin A dense foods a cat can eat, and cats are more susceptible to vitamin A poisoning than dogs (VCA Animal Hospitals). Vitamin A is fat soluble, so excess is stored in the body rather than flushed out, and it accumulates over weeks to months of over-feeding (VCA Animal Hospitals). That means a cat eating liver often, or in large amounts, can gradually build up toxic levels even though each individual serving seemed harmless. With liver, dose and frequency — not the food itself — decide whether it helps or harms.

How much liver can a cat eat

There is no precise safe gram figure, so the practical rule is to keep liver to a small, occasional treat. Like other extras, organ meats should make up only a minor share of the diet — roughly no more than 5–10% of total intake — with the rest coming from a complete, balanced cat food (VCA Animal Hospitals). For most cats that means a piece of cooked liver no larger than a fingertip, offered now and then rather than daily. Frequency matters more than any single serving, because vitamin A is stored and accumulates over time, so a tiny amount eaten constantly is riskier than the same amount given occasionally (VCA Animal Hospitals).

The classic cause of vitamin A toxicity in cats is exactly what happens when liver stops being an occasional treat and becomes the diet. Hypervitaminosis A is seen in cats fed excess vitamin A, usually from diets consisting largely of liver (Merck Veterinary Manual). Vitamin A poisoning most commonly develops when cats are fed raw liver, cod liver oil or other vitamin A rich supplements over a period of several weeks to months (VCA Animal Hospitals). All-liver or liver-heavy homemade diets are the textbook trigger, which is why liver should complement a balanced diet, never form its base.

Signs of vitamin A toxicity (hypervitaminosis A) in cats

Hypervitaminosis A is primarily a skeletal disease. Affected cats develop exostoses — abnormal bony growths — that are most prominent along the cervical (neck) and thoracic spine, where they can bridge and stiffen the vertebrae (Merck Veterinary Manual). The hallmark clinical signs are neck pain and rigidity and forelimb lameness (Merck Veterinary Manual). As movement becomes painful, cats often become reluctant to move, groom poorly and develop a rough, unkempt coat, and may show weakness, weight loss, constipation and painful or limited movement (VCA Animal Hospitals). These bony changes are slow to appear but are not reversible — cutting vitamin A prevents further growth but does not undo lesions already formed (Merck Veterinary Manual; VCA Animal Hospitals). A single large one-off serving may instead cause short-term stomach upset. Any neck stiffness, lameness, reluctance to jump or persistent GI signs warrant a veterinary visit.

How to feed liver to your cat safely

If you offer liver, cook it plain. Cooking kills harmful bacteria such as Salmonella while keeping almost all of the nutritional value intact, and raw liver is one of the foods most associated with vitamin A poisoning (VCA Animal Hospitals). Serve it with no added onion, garlic, salt, butter or seasoning, since onion and garlic are themselves toxic to cats. Keep portions tiny and infrequent — a fingertip-sized piece given occasionally, not daily. Remember that a complete, balanced commercial cat food already contains an appropriate amount of vitamin A, so liver is a bonus treat, not a nutrient your cat is missing.

Most importantly, never make liver a dietary staple or the base of a homemade diet without formulation by your veterinarian or a board-certified veterinary nutritionist (VCA Animal Hospitals). The cats that develop hypervitaminosis A are almost always those eating liver-heavy or all-liver diets, not those getting an occasional taste (Merck Veterinary Manual). Watch for early warning signs — neck stiffness, reluctance to move or groom, lameness or a deteriorating coat — and stop offering liver and contact your veterinarian if any appear. Because the skeletal changes are permanent, prevention through sensible portioning is far more important than treatment.

Frequently asked questions

Is liver toxic to cats?

Not in small, occasional amounts — a little plain cooked liver is actually very nutritious for cats, supplying preformed vitamin A, taurine and B12 they need (VCA Animal Hospitals). The danger is dose and frequency. Liver is extremely rich in vitamin A, which is stored in the body, and cats are more susceptible to vitamin A poisoning than dogs (VCA Animal Hospitals). Fed often or in large amounts over weeks to months, liver causes hypervitaminosis A, a painful bone disease (Merck Veterinary Manual). So liver is fine as a rare treat but harmful as a staple.

What is vitamin A toxicity in cats?

Vitamin A toxicity, or hypervitaminosis A, is a disease caused by too much vitamin A building up in the body, classically in cats fed diets consisting largely of liver (Merck Veterinary Manual). It mainly damages the skeleton, producing abnormal bony growths (exostoses) most prominent along the neck and chest portion of the spine, which stiffen the vertebrae (Merck Veterinary Manual). Typical signs are neck pain and rigidity and forelimb lameness (Merck Veterinary Manual). The bone changes are not reversible, so reducing vitamin A halts progression but cannot undo existing damage (VCA Animal Hospitals).

Can cats eat raw liver?

Cooking is advised. Raw animal protein can carry pathogens such as Salmonella, and cooking kills these bacteria while preserving almost all of the nutritional value (VCA Animal Hospitals). Raw liver is also specifically one of the foods most linked to vitamin A poisoning in cats (VCA Animal Hospitals). Importantly, feeding it raw does not reduce the vitamin A overdose risk — raw liver is just as vitamin A dense as cooked, so the same limits on portion size and frequency apply either way. Offer only a small amount of plain, cooked liver occasionally.

For related context, see our Can Cats Eat Chicken? and Best Cat Food for Kittens. To check whether your cat’s food contains any of these ingredients, paste the ingredient list into the KibbleIQ analyzer. For methodology context, see our published methodology.