# Can Cats Eat Raw Tuna?
## Key Takeaways

- Raw tuna contains thiaminase, an enzyme that degrades thiamine (Vitamin B1), potentially leading to neurological deficits such as ataxia, seizures, and coma due to impaired carbohydrate metabolism and nervous system function.
- Tuna, particularly larger species, can accumulate high levels of mercury, posing a risk of toxicity in cats, manifesting as incoordination, tremors, blindness, and behavioural changes.
- Raw tuna is a potential vector for zoonotic pathogens, including *Salmonella*, *Listeria*, and *E. coli*, as well as parasites like tapeworms, increasing the risk of foodborne illness in cats, especially immunocompromised individuals.
- Tuna is nutritionally incomplete for cats, lacking essential nutrients like taurine and vitamin E, which are critical for preventing conditions such as blindness, heart disease, and steatitis.
- Cooked, plain tuna (canned in water, no salt/oil) is considered a safe occasional treat, but should not exceed 10% of a cat's daily caloric intake, with smaller, low-mercury fish like sardines or trout being preferable alternatives.

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Many cat owners know that felines love fish, and tuna is a common favourite. But when it comes to feeding raw tuna, the answer is not straightforward. While a small bite of plain, sushi-grade raw tuna is unlikely to cause immediate harm, there are significant health risks that every responsible pet owner should understand before making this a regular treat. This article provides a clinical yet accessible overview of the risks, benefits, and best practices regarding raw tuna for cats.

## Quick Q&A: Common Questions

**Question:** Can cats eat raw tuna from a can or sushi?

**Answer:** Cats can eat plain, cooked tuna in moderation, but raw tuna carries risks of bacterial contamination (like Salmonella and Listeria) and parasites. Additionally, regular consumption of tuna, especially raw, can lead to mercury poisoning and thiamine deficiency. It is safest to stick with commercially prepared cat foods that include tuna as a balanced ingredient.

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## Understanding the Risks of Raw Tuna for Cats

While cats are obligate carnivores and can digest raw meat, raw tuna specifically poses unique dangers. The American Veterinary Medical Association (AVMA) and the American Animal Hospital Association (AAHA) advise against feeding raw or undercooked animal-source protein to pets due to the risk of foodborne illness. Similarly, the European Medicines Agency (EMA) and the Canadian Veterinary Medical Association (CVMA) endorse these guidelines.

### 1. Thiamine Deficiency (Vitamin B1 Deficiency)

Tuna (and other fish) contains an enzyme called thiaminase, which breaks down thiamine (vitamin B1). Thiamine is essential for normal nervous system function and carbohydrate metabolism. Chronic consumption of raw tuna can lead to thiamine deficiency, which may cause neurological signs such as:
- Loss of appetite
- Dilated pupils
- Wobbly gait (ataxia)
- Seizures
- Coma (in severe cases)

Cooking tuna destroys thiaminase, so cooked tuna does not carry this risk.

### 2. Mercury and Heavy Metal Toxicity

Tuna, particularly larger species like albacore (white tuna), can accumulate high levels of mercury. Cats are small animals, and even moderate amounts of tuna can lead to mercury poisoning over time. Signs of mercury toxicity include:
- Incoordination (ataxia)
- Tremors
- Blindness
- Behavioural changes

The US Food and Drug Administration (FDA) advises limiting tuna consumption in humans, and the same caution applies to cats. The Australian Veterinary Association (AVA) similarly warns against feeding large predatory fish due to heavy metal accumulation.

### 3. Bacterial and Parasitic Infections

Raw tuna can harbour harmful bacteria such as Salmonella, Listeria, and E. coli, as well as parasites like tapeworms (Diphyllobothrium latum). Even "sushi-grade" raw fish is not guaranteed to be free of pathogens, as it is often frozen to kill parasites but may still contain bacteria. Cats with compromised immune systems, kittens, or senior cats are at higher risk.

### 4. Nutritional Imbalance

Tuna is not a complete and balanced diet for cats. It is deficient in taurine (an essential amino acid for cats), vitamin E, and other key nutrients. Feeding tuna as a primary food source can lead to serious health problems, including:
- Taurine deficiency (causing blindness, heart disease, and reproductive issues)
- Steatitis (inflammation of fat tissue, often from too much unsaturated fat)

## Is Any Tuna Safe for Cats?

Plain, cooked tuna (canned in water, no salt or oil) is generally safe as an occasional treat. The AVMA and AAHA recommend that treats (including fish) should make up no more than 10% of a cat's daily calorie intake. For a 10-pound (4.5 kg) cat, this is roughly 20-25 calories per day. A single tablespoon of canned tuna (packed in water) contains about 20-25 calories, so it should be given sparingly.

### What About Raw Tuna as Part of a Raw Diet?

Some pet owners choose to feed a raw diet (including raw fish) under the guidance of a veterinary nutritionist. However, raw tuna is not recommended even in these diets due to the thiaminase and mercury risks. If you are considering a raw diet for your cat, consult with a board-certified veterinary nutritionist (ACVN or ECVCN) to ensure the diet is balanced and safe.

## Home Care: What to Do If Your Cat Eats Raw Tuna

If your cat accidentally eats a small amount of raw tuna (e.g., a piece dropped on the floor), monitor for signs of gastrointestinal upset (vomiting, diarrhoea/diarrhoea, lethargy) over the next 24-48 hours. Most healthy adult cats will be fine after a small amount. However, if your cat develops any of the following symptoms, contact your veterinarian promptly:
- Repeated vomiting or diarrhoea/diarrhoea
- Loss of appetite for more than 12 hours
- Lethargy or weakness
- Neurological signs (tremors, wobbliness, seizures)

## What to Expect at the Vet

If you suspect your cat has eaten a large amount of raw tuna or is showing signs of illness, your veterinarian will perform a thorough physical examination and may recommend:
- Faecal/fecal testing for parasites
- Bloodwork to check for organ function and electrolyte imbalances
- In cases of suspected thiamine deficiency, a trial of thiamine supplementation may be given (injectable or oral)

Treatment is generally supportive, including fluids for dehydration, anti-nausea medication, and a bland diet. Most cats recover fully with prompt veterinary care.

## Prevention: Best Practices for Feeding Fish to Cats

To keep your cat safe while still allowing the occasional fishy treat, follow these guidelines from international veterinary consensus:

1. **Cook fish thoroughly**: Always cook fish (baked, poached, or grilled) without added salt, oil, or seasonings.
2. **Avoid raw fish entirely**: This includes sushi, sashimi, and raw [pet food](/knowledge/veterinary-medicine/nutrition/pet-food) containing fish.
3. **Choose low-mercury fish**: Smaller fish like salmon, sardines, or trout are safer options. Limit tuna to less than once per week.
4. **Portion control**: Treats should never exceed 10% of daily calories.
5. **Stick to commercial [cat food](/knowledge/veterinary-medicine/nutrition/cat-food)**: High-quality cat foods that contain tuna are formulated to be safe and nutritionally complete.

## Conclusion

While a tiny nibble of raw tuna is unlikely to harm a healthy adult cat, the risks of thiamine deficiency, mercury toxicity, bacterial infection, and nutritional imbalance make it an unsafe regular addition to your cat's diet. The consensus among veterinary organisations worldwide (AVMA, AAHA, CVMA, AVA, FVE/EMA) is clear: stick to cooked, plain fish as an occasional treat, and prioritise a complete and balanced commercial [cat food](/knowledge/veterinary-medicine/nutrition/cat-food) for your feline friend. When in doubt, always consult your veterinarian for advice tailored to your cat's specific health needs.

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