Can cats eat acorns? No — why, and what to do
Quick answer: No — acorns is not safe for cats and should never be given.
Quick verdict
Unsafe
Key risk
Tannins can cause stomach upset and organ damage.
Why
Acorns are toxic to cats and must be avoided.
Can cats eat acorns, and why?
Acorns are toxic to cats and must be avoided. Tannins can cause stomach upset and organ damage.
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
Tannins can cause stomach upset and organ damage.
If your cat has eaten acorns, 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
Keep acorns out of reach
If your cat has eaten acorns, ring your vet — do not wait to see what happens. For preventing a repeat:
Plush Snuffle Foraging Mat
A roll-up plush snuffle mat with cute animal designs. Hide treats in the folds and let your pet sniff and forage to find them - a rewarding enrichment game that beats boredom and slows feeding.
£13.99
Tarhong Paw Ikat Teal Pet Placemat – BPA-Free PVC & EVA
A vibrant teal ikat placemat with paw print accents — BPA-free, wipe-clean, and 29 × 48 cm for protecting floors under pet bowls.
£8.49
Tarhong Concentric Circle Slow Feeder Bowl for Dogs & Cats
A stylish slow-feeder bowl that encourages healthier, calmer mealtimes — available in blue, grey, or white.
£14.99
Tarhong Country Orchard Melamine Pet Saucer
A pretty fruit and floral orchard-print melamine saucer for pets — BPA-free, non-slip, shatterproof, and dishwasher safe at 13.2 cm.
£9.49
Feeding & nutrition guides
Frequently asked questions
Can cats eat acorns?
Unsafe. Acorns are toxic to cats and must be avoided.
What happens if my cat eats acorns?
Tannins can cause stomach upset and organ damage. If your cat has eaten acorns, contact your vet or the Animal PoisonLine (01202 509000) straight away — don’t wait for symptoms.
Is acorns poisonous to cats?
Unsafe. Acorns are toxic to cats and must be avoided.
Free printable: safe & toxic foods for cats
acorns 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 acorns for another pet
Sources
Our verdict on whether cats can eat acorns draws on established UK and US veterinary and welfare organisations. Individual pets, quantities and preparation vary — always confirm with your own vet.