Why leaf toxicity varies by season
Autumn crocus leaves contain the highest colchicine concentrations in late summer when the plant prepares to bloom. Your dog’s 5 kg size makes even a few leaves dangerous—the toxin threshold is lower than for larger breeds. Older leaves may have less toxin than fresh ones, but never assume safety based on appearance.
Watch the other dogs for indirect exposure—if the affected pup vomited or drooled, others may ingest the toxin secondhand. Colchicine lingers in bodily fluids for days, so separate food bowls and bedding immediately.
The domino effect in small dog groups
Multiple small dogs sharing space with one exposed individual can create a cascade of poisoning. Symptoms might appear first in the smallest or youngest dog, regardless of who ate the most. Check gums for unusual paleness—an early sign of bone marrow suppression that precedes vomiting.
If they normally play-bite or groom each other, assume all were exposed. Colchicine transfers easily through saliva. The "non-exposed" dogs may actually be on a delayed timeline—monitor them for 72 hours minimum.
Garden management after exposure
Autumn crocus leaves resemble wild garlic, so other dogs may have sampled them unnoticed. Dig up any remaining plants with gloves—the corms (underground stems) are the most toxic part. Until the area is cleared, leash-walk the others and check their mouths for green stains.
Rinse the exposed dog’s muzzle with water to remove plant residue, but don’t let others drink from the same bowl. Colchicine dissolves easily in water, creating a secondary exposure risk. Save a leaf sample in a sealed bag—vets need to verify the plant species.
When to insist on blood tests for the group
Even asymptomatic dogs should have baseline bloodwork if they shared space with the exposed individual. Colchicine’s effects on white blood cell counts can take 24-48 hours to appear. A normal checkup today doesn’t guarantee safety tomorrow.
Pack each dog’s medical history—pre-existing conditions like liver shunts magnify colchicine’s impact. If one shows symptoms, the others likely need preventive care too. This isn’t overcaution—the toxin’s delayed action means early intervention is the only reliable safeguard.
The step-by-step response, from the first minute to the vet visit, is in our Autumn Crocus / Meadow Saffron emergency guide.