Which plants are most poisonous to cats?+
True lilies (Lilium) and daylilies (Hemerocallis) are among the most dangerous: every part, including pollen and vase water, can cause kidney failure in cats. Sago palm, oleander, and autumn crocus are also very dangerous.
Which plants are most poisonous to dogs?+
Sago palm (especially the seeds), oleander, yew, autumn crocus, and castor bean can be life-threatening. Bulbs of tulips, hyacinths, and daffodils commonly cause vomiting when dogs dig them up.
My pet chewed a houseplant like pothos. Is it an emergency?+
Plants like pothos, philodendron, and dieffenbachia usually cause mouth pain, drooling, and vomiting rather than organ damage, but call your vet or a poison helpline to be sure, especially for small pets or large amounts.
Is this a complete list?+
No. It covers common, dangerous plants. The ASPCA keeps a searchable list of toxic and non-toxic plants, and the VetStack toxic plants reference has more detail.