Why it's dangerous
The Autumn Crocus contains colchicine, which inhibits cell division and causes multi-organ failure, while Spring Crocus causes general gastrointestinal irritation.
Toxic compound: Colchicine
Good to know
Distinction is critical between Spring Crocus (Iridaceae) and Autumn Crocus (Liliaceae); the latter is highly toxic with symptoms that can be delayed for days.
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.