How a puppy's size turns a nibble into an emergency
At 10 weeks old, your puppy likely weighs under 5 kg—meaning even a pea-sized amount of certain rodenticides can be fatal. Puppies also metabolize toxins faster than adults, with some poisons causing symptoms within 30 minutes. The green color suggests this might be a bromethalin-based neurotoxin, but only the packaging's ingredient list provides certainty.
Right now, every minute counts for two reasons: puppies absorb toxins rapidly through their immature digestive tracts, and their developing nervous systems are especially vulnerable. If you can't immediately locate the packaging, assume the worst-case scenario and head to the nearest emergency vet while calling poison control en route.
Why visual monitoring isn't enough
Unlike adult dogs who may show gradual symptoms, puppies often deteriorate suddenly—one moment playing, the next seizing. Some rodenticides cause delayed bleeding (days later), while others trigger brain swelling within hours. Your puppy might initially seem fine, then develop wobbliness, excessive thirst, or uncontrolled tremors.
Confine your pup in a carrier or small bathroom with towels on the floor—this prevents injury if neurological symptoms appear during transport. Do not offer food or water unless directed by a professional, as some rodenticides interact dangerously with dietary fats. Note the exact time of ingestion; this helps the vet calculate treatment windows.
The lethal math behind rodenticide blocks
Commercial blocks are designed to kill multiple rodents, containing 10-50 times the lethal dose for a single animal. Even if your puppy didn't finish the whole block, the irregular chewing pattern means he likely ingested concentrated chunks rather than evenly distributed amounts. Bromethalin, for example, can be fatal at 0.5 mg/kg—a tiny fraction of what's in most blocks.
Certain ingredients also have a 'storage effect' where the toxin builds up in the liver before causing sudden illness days later. This is why immediate blood tests are crucial—they establish baseline organ function before damage becomes apparent. Your vet may recommend hospitalization solely for monitoring, even before symptoms develop.
Emergency clinic protocols for puppy poisonings
Expect the vet team to move quickly—they may start IV fluids before even identifying the toxin to support kidney function. For recent ingestions (under 2 hours), they might perform gastric lavage under anesthesia rather than inducing vomiting, as puppies aspirate easily. Activated charcoal will likely be given via stomach tube, not voluntarily.
If the block contained bromethalin, treatments may include mannitol to reduce brain swelling and anti-seizure medications as preventatives. Anticoagulant types require vitamin K1 injections, but this won't help with neurotoxic varieties. Bring any vomit or chewed block fragments in a sealed bag—these can be tested to tailor treatment.
The step-by-step response, from the first minute to the vet visit, is in our Rat Poison (Rodenticide) Poisoning emergency guide.