Why it's dangerous
The plants contain allergenic lactones concentrated in the bulbs that cause direct tissue irritation to the mouth and esophagus upon contact or ingestion.
Toxic compound: allergenic lactones or similar alkaloids
Good to know
The toxic principle is most concentrated in the bulbs; severe poisoning often occurs when dogs dig up freshly planted bulbs.
Sources
This page is informational and is not veterinary advice. If your pet has been exposed to something risky, contact your vet or an animal poison control line right away.