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11 Human Foods That Are Poisonous to Cats

Humans and cats both need diets that include water and protein, but that’s usually where the similarities end. Cats have starkly different nutritional needs and many human foods can be poisonous, causing digestive issues, vitamin deficiencies, anemia and even life-threatening conditions. So even though your curious cat might be intrigued by the smell of your dinner simmering on the stove, it’s crucial to know how the ingredients could affect their health. Read on for details:

11 Foods That Are Toxic to Cats 

1. Alcohol

Wine, beer, liquor and food that contains alcohol can result in diarrhea, vomiting, breathing problems, tremors and other serious conditions. “Just two teaspoons of whisky can cause a coma in a 5-pound cat,” reports Fetch by WebMD. “And one more teaspoon could kill it.

2. Chocolate

The cacao seeds that are used to make chocolate contain methylxanthines, which are naturally occurring compounds found in many plants. Theobromine and caffeine are two types of methylxanthines that can be very toxic to cats.

Cats that experience chocolate poisoning usually show the following symptoms:

  • Diarrhea
  • Vomiting
  • Weakness
  • Rapid breathing
  • Elevated temperature
  • Muscle rigidity
  • Increased reflex response
  • Seizures
  • Cardiac arrest
  • Coma

Chocolate Toxicity Levels in Cats

The Spruce outlines the toxicity levels by different types of chocolate for an 8 lb. cat:

Type of Chocolate Minimum Toxic Amount for an 8 lb. Cat
Milk 1.14 oz.
Dark 0.5 oz.
Semi-Sweet 0.5 oz.
Baking 0.2 oz.
White n/a

This chart lists approximate amounts. If your cat consumes any amount of chocolate, you should consult with your vet.

3. Dog Food

Dog food contains many of the same ingredients as cat food and an occasional bite here and there won’t necessarily be harmful. However, dog food should never be used as a substitute for cat food. Cats have specific nutritional needs that they get from cat food, such as high amounts of protein, vitamins and fatty acids.

Dog food should never be a substitute for cat food. Fetch by WebMD says that a steady diet of dog food could cause severe malnourishment in cats.

4. Grapes & Raisins

According to the ASPCA, grapes and raisins contain an unknown toxic substance that can cause kidney failure in cats. To be safe, the ASPCA advises pet owners to avoid feeding grapes or raisins to their cats. 

5. Liver

Too much liver can cause vitamin A toxicity, a serious condition that can affect a cat’s bones and lead to death in severe cases. Fetch by WebMD notes that effects of vitamin A toxicity include deformed bones, bone growths on the elbows and spine, and osteoporosis.

6. Milk & Dairy Products

Cats become lactose intolerant as they mature, which means they have trouble digesting dairy products. Consuming high or frequent amounts of dairy products containing lactose can lead to gastrointestinal pain and diarrhea.

7. Onions, Garlic & Chives

Onions can break down a cat’s red blood cells, which can cause weakness, shortness of breath and anemia. Garlic (which is 5x as potent as onions) and chives can cause similar health problems.

Whether powered, cooked, raw or dehydrated, do not give your cat onions, garlic or chives.

8. Raw/Undercooked Meat, Eggs & Fish

Raw meat, raw fish and raw eggs often contain bacteria like Salmonella and E. coli that can be harmful to both humans and immunocompromised pets.

Fetch by WebMD explains that raw eggs contain an enzyme that decreases the absorption of biotin (a B vitamin), which can lead to skin and coat problems. Raw fish also contains an enzyme that destroys thiamine, another essential B vitamin. Without thiamine, a cat can develop neurological problems that could lead to convulsions or coma.

Are Raw Food Diets Safe for Cats?

There are safe ways to feed your cat raw foods. Prepared, raw diets made specifically for pets are regulated to ensure that they do not contain harmful bacteria. You can learn more about raw diets for cats in our blog post: Should You Feed Your Cat a Raw Diet? 11 Questions to Ask First.

9. Canned Tuna

Feeding your cat a steady diet of canned tuna can cause malnutrition because it doesn’t contain the necessary nutrients for a feline. Too much tuna can also increase the risk of mercury poisoning.

If your cat loves the fishy taste and smell of tuna, you can try feeding them a prepared cat food made with human-grade tuna. Pet foods designed to be fed on a regular basis are required to provide the vitamins and minerals cats need, so they will be getting the right nutrients while also satisfying their craving.

10. Uncooked Potatoes & Tomatoes

ModernCat reports that raw potatoes and tomatoes can cause gastrointestinal distress, but they have no toxic effects if cooked. However, green potatoes (cooked or raw) can lead to cardiac issues, hallucinations and paralysis, so make sure to keep them away from your cat.

11. Yeast Dough

The ASPCA says that “yeast dough can rise and cause gas to accumulate in your pet’s digestive system.” This can cause your cat’s stomach to bloat and become painful. Their stomach can potentially twist which would be a life-threatening emergency.

What to Do if Your Cat Eats Something Toxic

The most common signs of toxicity in cats are:

  • Breathing problems
  • Confusion
  • Coughing
  • Depression
  • Diarrhea
  • Dilated pupils
  • Drinking and urinating more
  • Upset stomach
  • Seizures
  • Shivering
  • Skin irritation
  • Tremors
  • Vomiting
  • Weakness

If you suspect that your cat may have eaten something toxic, you should:

  • Watch for symptoms. Keep a close eye on your cat to observe any non-typical behavior or signs of stress.
  • Call your vet. If it’s outside of your regular vet’s operating hours, contact an emergency vet clinic.
  • Bring vomit or stool samples to the vet, if you are able.

1-800-PetMeds reports that “about 25% of poisoned pets recover within two hours.” Pets can often be treated at home under the guidance of a veterinarian or with advice from the ASPCA’s Poison Control Center.

Human Foods That Are Safe For Cats


Cheese can be high in protein, which makes it a nice occasional treat. As we mentioned, cats have a sensitivity to dairy products that can cause gastrointestinal pain or diarrhea. If you give your cat cheese, make sure it is in a very small amount and not on a frequent basis. 

Cooked Eggs

Eggs can be a good source of protein for your cat, but make sure that they are cooked. Raw or uncooked eggs can contain harmful bacteria that can upset your cat’s digestive system.


Rich in omega-3 fatty acids, fish can help with arthritis, kidney disease and heart disorders. Choose canned or cooked fish and only give it to your cat as a treat every now and then. Just don’t give your cat raw fish, like sushi.


Cats in the wild eat high-protein, meat-based diets, and domesticated felines need the same kind of nutrition. However, if you wouldn’t eat a certain piece of meat, then you shouldn’t offer it to your cat.

Feeding your cat a meat-based diet is the best way to make sure that they are getting the nutrients they need. Always choose wet canned food and dry food that features high-protein, high-moisture, moderate fat and low carbs.  


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Written by:
Jim Scott
A third-generation RAWZ family member, Jim spreads the word of optimal pet nutrition through in-store product demos and regular articles for the RAWZ blog. After sustaining a traumatic brain injury in 2006, Jim began participating in the writing program at the Krempels Center in Portsmouth, NH. Writing was a way to process and heal from his injury — but Jim realized he could also use this skill to spread awareness of the RAWZ brand and mission. Jim covers a range of pet health issues for the company blog, as well as more personal stories that connect to the causes RAWZ supports. His favorite thing to write about? People’s strong bonds with their pets.
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