Is Oak Tree (acorns) Toxic to Cats?
Also known as: Acorns, Oak Leaves, Quercus spp. · Quercus spp.
What makes it toxic
Gallotannins (tannic acid) concentrated in acorns and young oak leaves. Tannins burn the gut lining and, at high doses, damage the kidneys.
Warning signs to watch for
Drooling, vomiting, diarrhea and abdominal pain within hours. Heavy ingestion can bring lethargy, increased thirst, reduced urination and kidney injury over days.
What to do if your cat eats it
Remove acorns and call your vet promptly with the amount eaten. If the cat becomes lethargic, drinks excessively or stops urinating, treat it as an emergency.
Common questions
Do cats actually eat acorns?
Rarely — cats are not grazers like dogs. The realistic risk is a curious kitten batting and mouthing acorns indoors after they are carried in.
Is one acorn dangerous?
A single acorn usually causes mild GI irritation at most. The tannin dose scales with the amount eaten, so multiple acorns deserve a vet call.
Are oak leaves in autumn as risky as acorns?
Young spring leaves carry more tannin than mature fallen leaves, but both count as toxic material if eaten.
More plants checked for cats
This page is general educational information, not a substitute for professional veterinary advice. Every pet is different — if your animal ate something concerning, contact your veterinarian or a pet poison hotline right away. Checking what your pet can eat? Visit our sister site SafeOrToxic.