Why a crumb is critical for a 2 kg puppy
At this weight, your puppy's blood volume is roughly a tenth of an adult dog's, so poison concentrations spike faster. The crumb likely contains enough active ingredient to disrupt clotting for days. Unlike adult dogs, puppies also have immature liver function, slowing their ability to process toxins even at low doses.
Watch for subtle changes like less playful energy or taking longer naps—these can precede bleeding symptoms. The first visible signs might be a single speck of blood in their stool or a slightly swollen joint from internal seepage.
Why tomorrow is too late to act
Anticoagulants work silently—by the time you see bloody gums or labored breathing, your puppy has already lost significant blood internally. Their small size means they compensate poorly; a tablespoon of internal bleeding could drop their blood pressure dangerously.
Vets often give vitamin K1 proactively to puppies because reversal takes hours. Delaying means the poison keeps working while you wait, increasing transfusion risks later.
How tiny mouths increase exposure risk
Puppies explore with their tongues, so a 'crumb' to you could fully coat their mouth. Their higher metabolic rate also speeds toxin absorption compared to adult dogs. What seems like a brief lick may deliver more poison than you'd expect.
Check between their toes and under their tongue—bait grains often stick there, causing ongoing exposure. Use a damp cloth to wipe their gums if they’ll tolerate it.
What emergency vets do differently for puppies
For a 2 kg patient, vets calculate vitamin K doses to the milligram and may hospitalize for observation even after treatment. They’ll likely run a clotting test (PT) immediately and repeat it in 48 hours to catch delays.
Expect recommendations for follow-up blood work—puppies can develop anemia from even minor bleeding. Your vet might suggest switching to liquid vitamin K for easier dosing in small mouths.
The step-by-step response, from the first minute to the vet visit, is in our Anticoagulant Rodenticide Toxicity in Dogs and Cats emergency guide.