Can Cats Eat Onions? NZ Safety Answer

Quick answer

No. Cats should not eat onions. VCA's cat toxic-hazard guidance lists onion, chives, leeks, shallots and garlic as hazards for cats, and ASPCA also lists onion and garlic among people foods pets should avoid.

Why

Onion is often hidden in foods cats may lick or steal: gravy, mince, roast leftovers, soups, sauces, baby food, pizza toppings and seasoned tuna or chicken. Powdered onion and garlic seasoning still count. This is a bigger risk in shared kitchens where plates are left out after dinner.

If your cat ate it

Contact your NZ vet, after-hours emergency clinic, or SPCA for advice.

Safer alternatives

Use complete cat food or a cat-specific treat. If you want to offer plain cooked meat, ask your NZ vet what is suitable for your cat and keep it unseasoned.

Related reading

• Cat Food Guide NZ
• Cat Care NZ Complete Guide
• New Kitten Checklist NZ
• Pet Emergency Kit NZ Civil Defence Guide

References

• VCA Animal Hospitals, Toxic Household Hazards for Cats, checked 2026-06-11: https://vcahospitals.com/know-your-pet/household-hazards-toxic-hazards-for-cats
• ASPCA Animal Poison Control, People Foods to Avoid Feeding Your Pets, checked 2026-06-11: https://www.aspca.org/pet-care/aspca-poison-control/people-foods-avoid-feeding-your-pets

Important notice

*General food-safety information for NZ pet owners, reviewed against ASPCA/VCA guidance (June 2026). For any suspected ingestion or illness, contact a NZ vet, after-hours emergency clinic, or SPCA for advice.*