Why a kitten’s size makes this so urgent
A 1.5 kg kitten has barely any blood volume compared to an adult cat, so anticoagulant rodenticides can disrupt clotting dangerously fast. Newer poisons like bromethalin attack the nervous system directly — you might see wobbling or sudden collapse before any bleeding signs appear. The green color only tells us it’s bait, not what’s in it; the packaging’s fine print is what the vet needs.
Kittens explore with their mouths, so even if you didn’t see them swallow it, assume they did. Their liver enzymes are also immature, making toxin breakdown slower. If the bait was fresh (not weathered), the concentration is at its peak. Time matters more than the exact amount eaten at this weight.
What to grab before leaving for the vet
Snap a photo of the bait’s packaging immediately — even a blurry shot of the product name helps. If you can’t find it, note where the block was stored (shed, garage, under sink) and whether other pets had access. Vets prioritize cases where the active ingredient is unknown because treatments differ wildly.
Bring the kitten in a carrier with a towel you don’t mind ruining — bleeding disorders can cause messy fluid leaks. Don’t wait for symptoms; by the time a kitten this small shows weakness or labored breathing, their condition may be critical.
Why this isn’t like adult cat poisoning
Adult cats often vomit after tasting rodenticides, but kittens lack that reflex as strongly. Their curiosity also means they’re more likely to chew repeatedly rather than spit it out. Even if the block looks barely touched, tiny teeth marks could mean enough was ingested.
Some rodenticides cause fluid buildup in the lungs — a kitten’s small chest means even mild swelling can compromise breathing fast. Watch for open-mouth panting or a blue tinge to gums, but again, don’t wait for these signs to act.
The first 24 hours at the vet
Expect blood tests to check clotting times, possibly repeated every few hours. Vitamin K1 injections are common for anticoagulant types, but if it’s bromethalin, treatment focuses on reducing brain swelling. Your kitten may need IV fluids to protect their kidneys while the toxin processes.
Even if they seem fine after initial care, some rodenticides have delayed effects. The vet may keep them overnight for monitoring. Ask about follow-up blood work — clotting issues can resurface days later.
The step-by-step response, from the first minute to the vet visit, is in our Rat Poison (Rodenticide) Poisoning emergency guide.