Why bloody diarrhoea changes everything
That streak of red in the litter box isn't just irritation — it's a five-alarm warning. Autumn crocus toxins destroy the intestinal lining's ability to regenerate, causing tissues to slough off. For a 5 kg cat, even a nibble can lead to catastrophic fluid loss through the damaged gut. Blood means the poisoning has progressed beyond the point of home observation.
Unlike food poisoning where diarrhoea might improve, this will escalate. Colchicine continues working for days, suppressing bone marrow's ability to make platelets and white blood cells. Your cat could seem stable tonight but develop unstoppable bleeding or overwhelming infection by tomorrow. Emergency vets often hospitalize these cases for intravenous fluids and plasma transfusions.
The gas you're noticing isn't normal bloating
Those uncomfortable belly sounds accompany severe intestinal injury. As the toxin kills off gut lining cells, bacteria leak into the bloodstream while nutrient absorption fails. The resulting gas isn't from fermentation but from tissue necrosis. Combined with bloody stools, this indicates systemic poisoning requiring intensive care.
At this stage, withholding food is crucial to rest the damaged intestines. However, dehydration becomes lethal quickly in small cats — never restrict water, but do measure intake. If your cat drinks less than 20 ml per kg today (about 100 ml for your 5 kg cat), subcutaneous or IV fluids become essential to prevent kidney shutdown.
Why yesterday's nibble causes today's crisis
Colchicine's delayed action makes owners underestimate its deadliness. When your cat chewed that leaf 24 hours ago, the toxin was silently halting cell division throughout their body. Now, as intestinal cells that normally replace themselves daily fail to regenerate, the lining ulcerates. Bone marrow slows blood cell production just when clotting factors are needed most.
This explains the sudden onset despite the time lag. Monitor gum color — pale pink suggests anemia from blood loss or bone marrow suppression, while yellowish tones indicate liver involvement. Bruises or nosebleeds in the next 48 hours would confirm dangerously low platelets. Hospitalization can provide transfusions and medications to support these systems.
The dangerous hours ahead for a small cat
In the next 12-24 hours, your 5 kg companion faces cascading threats. Electrolyte imbalances from fluid loss can cause seizures. Low white blood cells invite septicemia. Kidney filtration rates may plummet as blood pressure drops. Unlike recoverable food poisoning, this requires round-the-clock veterinary intervention to survive.
Pack their carrier with any vomit or stool samples (even on paper towels) to help the vet assess bleeding severity. Note urine output — less than three clumps in the litter box today signals dehydration. Time matters more than cost concerns now; delayed care exponentially reduces survival odds with colchicine poisoning. Go now, before tremors or collapse begin.
The step-by-step response, from the first minute to the vet visit, is in our Autumn Crocus / Meadow Saffron emergency guide.