Can cats eat mayonnaise? Take care — the catch
Quick answer: Not recommended — mayonnaise is best avoided for cats.
Quick verdict
Caution
Key risk
High fat can cause stomach upset; not a suitable food.
Why
Mayonnaise is far too fatty for cats and offers nothing useful.
Can cats eat mayonnaise, and why?
Mayonnaise is far too fatty for cats and offers nothing useful. High fat can cause stomach upset; not a suitable food.
Cats are obligate carnivores: they must get most of their nutrition from meat and need nutrients such as taurine that only animal products provide. They lack some enzymes for processing plants and carbohydrates, so fruit and veg offer little benefit and can upset their stomach; many cats are also lactose intolerant.
Warning — what to watch for
High fat can cause stomach upset; not a suitable food.
If your cat has eaten mayonnaise, don’t wait for symptoms — contact your vet immediately, or call the Animal PoisonLine on 01202 509000 (24/7, UK). Signs of a problem can include vomiting, diarrhoea, drooling, lethargy, tremors or loss of appetite.
🚨 Find an emergency vet near youMore foods cats might eat
Feed cats safely
Portion control and slow feeding help when a food needs care:
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Feeding & nutrition guides
Frequently asked questions
Can cats eat mayonnaise?
Caution. Mayonnaise is far too fatty for cats and offers nothing useful.
What happens if my cat eats mayonnaise?
High fat can cause stomach upset; not a suitable food. If your cat has eaten mayonnaise, contact your vet or the Animal PoisonLine (01202 509000) straight away — don’t wait for symptoms.
Is mayonnaise poisonous to cats?
Caution. Mayonnaise is far too fatty for cats and offers nothing useful.
Free printable: safe & toxic foods for cats
mayonnaise is just one food — get the full one-page checklist of what’s safe, fine in moderation, or dangerous for cats. Vet-sourced, yours to print and keep.
Check mayonnaise for another pet
Sources
Our verdict on whether cats can eat mayonnaise draws on established UK and US veterinary and welfare organisations. Individual pets, quantities and preparation vary — always confirm with your own vet.