True lilies and daylilies in Pets
Any part of a true lily or daylily, even pollen or vase water, can cause kidney failure in cats. See which lilies are dangerous, the 24–72 hour timeline and why early vet care matters.
What It Is
Lilies of the genus Lilium (Easter, tiger, Asiatic, Oriental and Stargazer lilies) and daylilies (Hemerocallis) contain an unidentified water-soluble toxin that destroys kidney tubule cells in cats. Other plants called 'lily', such as peace lily or calla lily, cause mouth irritation but not kidney failure, and lily of the valley is a separate heart toxin.
Where Pets Come Across It
Cut flowers in bouquets are the usual source, especially around Easter and Mother's Day. Cats are poisoned by nibbling a leaf or petal, drinking water from the vase, or grooming pollen off their fur after brushing past the flowers.
Which Animals Are Affected
Cats. Dogs that eat lilies may vomit but do not develop the same kidney failure.
Published Toxic Dose
No safe amount is known. Pet Poison Helpline, the Merck Veterinary Manual and the US FDA all warn that small amounts of any part, including pollen and vase water, can cause acute kidney injury in cats. There is no mg/kg threshold to compare, so the calculator skips the dose maths: for cats it shows a zero-tolerance emergency result, and for other species it reports that no toxic dose is published.
Signs and How Soon They Appear
Vomiting, drooling and loss of appetite usually appear within 0 to 3 hours, then may seem to settle. Kidney failure develops 24 to 72 hours after exposure: the cat may urinate a lot at first, then very little or not at all, become weak and dehydrated, and stop eating. Without treatment it is often fatal.
What to Do Right Now
Treat any contact as an emergency and go to a vet straight away, even if your cat looks normal. Outcomes are much better when treatment starts early, ideally within the first 6 hours and before kidney failure begins. Bring the flowers or a photo. Do not make your cat vomit at home; household methods such as hydrogen peroxide can badly injure a cat's stomach. If you can do it without delay, wipe pollen off the coat with a damp cloth.
Frequently Asked Questions
Sources and References
- Pet Poison Helpline: Lilies
- US FDA: Lovely Lilies and Curious Cats
- Merck Veterinary Manual: Houseplants and Ornamentals Toxic to Animals
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