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Can cats eat mayonnaise?
Last updated 2026-05-08 · Sourced from ASPCA & Merck Veterinary Manual
Sometimes — with caution
Same.
The short answer
Sometimes — with caution — cats should only have small amounts of mayonnaise. Skip Egg-oil condiment.
Remember: cats are obligate carnivores. They derive almost all their nutrition from animal protein, so even "safe" plant foods are treats — not staples.
Why be careful
Same.
What to do if your cat ate mayonnaise
- Stay calm. Note how much was eaten and when.
- Call your vet or ASPCA Animal Poison Control at 888-426-4435.
- Or Pet Poison Helpline: 855-764-7661.
- Do not induce vomiting in cats unless instructed by a vet — it's risky.
- Bring product packaging to the vet visit.
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Kitten safety
Generally avoid feeding mayonnaise to kittens. Their digestive systems are still developing and they're more sensitive to changes in diet, fat, sodium, and lactose than adults. If you've already given some, watch for vomiting, diarrhea, or lethargy and contact your vet if any appear.
What to do if your cat ate mayonnaise
- Note how much was eaten and when. A small amount is rarely an emergency, but a large quantity may need vet attention.
- Watch for symptoms over the next 12–24 hours: vomiting, diarrhea, lethargy, loss of appetite, or changes in drinking/urination.
- Provide fresh water and skip the next meal if your pet seems unsettled — let their stomach calm down.
- Call your vet if symptoms appear or persist beyond 24 hours, or if the amount eaten was significant.
Better alternatives
If your cat likes mayonnaise, they may also enjoy these safe options:
Frequently asked questions
Is mayonnaise toxic to cats?
Not strictly toxic, but same.
How much mayonnaise is too much?
Any amount carries some risk. If you choose to feed mayonnaise, keep it to a tiny taste — not a regular treat.
Can kittens eat mayonnaise?
Avoid giving mayonnaise to kittens. Their digestive systems are still developing.
What should I do if my cat ate mayonnaise?
Watch for symptoms over the next 24 hours and contact your vet if anything concerning develops.
Frequently asked questions
Can cats eat mayonnaise?
Sometimes — with caution. Same.
What happens if a cat eats mayonnaise?
Watch for vomiting, lethargy, hiding, or refusal to eat.
Is mayonnaise toxic to cats?
Mayonnaise carries some risk for cats. Same.