🐱 Cat · 🧅 Onion

Can cats eat onions? Risks and What to Do If Eaten

Do not feed

Onion: do not feed; check suspected ingestion with a veterinarian.

Plain ingredient guidance; processed products need a separate check.

Suspected ingestion? Contact a veterinarian first.

Do not wait for symptoms after a known toxic exposure. Contact a veterinarian and keep the product, amount and time available. Do not induce vomiting yourself.

Read the immediate steps →

Check another food ↓

AT A GLANCE

The key checks at a glance

Preparation & conditions

No safe feeding preparation is provided here.

Read the details ↓02

Forms and situations to avoid

Do not wait for signs to declare safety or induce vomiting at home; a veterinarian decides care.

Read the details ↓03

If already eaten

Keep the product and record the amount, time and any changes.

Read the details ↓

Why this recommendation?

This is an Allium food with red-blood-cell injury risk, including cooked or powdered forms.

What to prepare or check

No safe feeding preparation is provided here. Record the product, amount and time.

When not to offer it

Do not wait for signs to declare safety or induce vomiting at home; a veterinarian decides care.

More detail for this food

Do not feed onions to cats. Merck identifies cats as sensitive to Allium foods and describes poisoning from raw, cooked and dried forms.

What if I remove onion pieces from soup?

Removing visible pieces does not establish the absence of onion ingredients. Check sauces, soups and powders.

My cat already ate some

Keep the label and record the estimated amount and time. Contact a veterinarian; this page does not calculate a safe dose or provide home treatment.

Already eaten? Start here

An “avoid” recommendation does not mean every accidental bite is poisoning. Ingredients, amount, time and the animal matter.

Stop further access and keep the food or packaging.
Record the species, product, estimated amount and time; say when an amount is unknown.
For a known hazardous ingredient, or unusual weakness, tremors or breathing, contact a veterinarian promptly. Do not wait for symptoms after a known toxic exposure.

Do not induce vomiting or give human medicines on your own.

What to tell the vet (Korean) →

Sources and scope

Food and species named in source

The linked material addresses this food and animal. Individual health and preparation still matter.

Merck: Allium toxicosis and feline susceptibility ↗

Content updated: 2026-10-07. AI-assisted editorial information, not veterinary review or a personalized feeding prescription.

How to read a recommendation (Korean) →

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Compare the preparation and cautions for each food. Foods shown together are not a recommended meal or a list of safe substitutes.

Cat · More foods to check

Can cats eat garlic?Do not feedDo not wait for signs to declare safety or induce vomiting at home; a veterinarian decides care.Can cats eat green onion?Do not feedDo not wait for signs to declare safety or induce vomiting at home; a veterinarian decides care.Can cats eat chocolate?Do not feedDo not wait for signs to declare safety or induce vomiting at home; a veterinarian decides care.Can cats eat xylitol?Wait for species-specific adviceDo not copy dog toxicity doses or overlook chocolate, caffeine and other ingredients.

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LIFE WITH YOUR PET

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Read the whole label for added ingredients and sweeteners.

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Keep the product name, batch and opening date available.

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A main diet or a treat? (Korean)

Distinguish a single ingredient from a complete main diet.

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Recent shelter notices

Collected public notices for this species. Check the official status; a notice does not confirm adoption availability.

Snapshot: 2026-11-06T16:45:27.078Z

보호중

[고양이] 한국 고양이

세종특별자치시

Found 2026-11-06 · 2020(년생)

Notice 세종-세종-2026-00328

Check official notices ↗

보호중

[고양이] 한국 고양이

세종특별자치시

Found 2026-11-06 · 2026(60일미만)(년생)

Notice 세종-세종-2026-00327

Check official notices ↗

보호중

[고양이] 한국 고양이

제주특별자치도

Found 2026-11-06 · 2026(년생)

Notice 제주-제주-2026-02666

Check official notices ↗

Photos and notices: Animal Protection Information System. Collection covers only some recent notices. View official notices ↗

Advertising and affiliate products do not determine food recommendations.

The key checks at a glance

Preparation & conditions

Forms and situations to avoid

If already eaten

Why this recommendation?

What to prepare or check

When not to offer it

More detail for this food

What if I remove onion pieces from soup?

My cat already ate some

Already eaten? Start here

Sources and scope

What else would you like to know about life with pets?

Looking for a missing family member?

An apple, five pets—why did I build PetNyam?

Could your pet be older than you?

Pet food ingredients—what is in them?

What else is on your pet’s menu?

Your saved foods

More to explore with your cat

Same food name, different product? (Korean)

Keep a food storage record (Korean)

A main diet or a treat? (Korean)

Recent shelter notices

[고양이] 한국 고양이

[고양이] 한국 고양이

[고양이] 한국 고양이