My dog ate rat poison — is it an emergency?
Yes, urgently. Different rat poisons cause different problems — anticoagulants cause internal bleeding 3–5 days later; bromethalin causes brain swelling within hours; cholecalciferol causes kidney failure. The specific type changes the treatment, so bring the packaging or a photo to your vet. Call ASPCA Animal Poison Control or your vet now.
EmergencyASPCA Animal Poison Control (US, 24/7): (888) 426-4435
Signs to watch for
- Lethargy, weakness, or unusual quietness (all types)
- Pale gums (anticoagulant rodenticides — signals internal bleeding)
- Coughing, bloody nose, or blood in stool/urine (anticoagulants)
- Bruising on the gums or belly (anticoagulants)
- Wobbling, tremors, seizures, or paralysis (bromethalin)
- Increased thirst and urination, then decreased urination (cholecalciferol — kidney failure)
- Vomiting and abdominal pain (all types)
- Bloody vomit (anticoagulant rodenticides — late sign)
Timeline
The four types of rat poison — and why the type matters
Treatment is completely different depending on the active ingredient, so identifying it is the single most important thing you can do before the vet visit.
- **Anticoagulant rodenticides** (brodifacoum, bromadiolone, difethialone, warfarin, chlorophacinone). The most common kind — D-Con, Tomcat, Final, Hot Shot, and most others. Block vitamin K, which is needed to clot blood. Internal bleeding starts 3–5 days after ingestion, sometimes longer for the second-generation poisons. Antidote: vitamin K1 (oral, prescribed for 4–6 weeks).
- **Bromethalin** (Fastrac, Talpirid, Top Gun Quad). A neurotoxin. Causes brain swelling and nerve damage. No antidote — treatment is decontamination and supportive care. Symptoms can begin within 2 hours and progress to seizures or paralysis. The most dangerous type once symptoms develop.
- **Cholecalciferol** (vitamin D3) (Terad3, Rampage, Quintox). Causes calcium levels to spike, leading to kidney failure and tissue mineralization. Treatment is aggressive — IV fluids for days, often a drug called pamidronate, and constant monitoring. Outcomes depend on early detection.
- **Phosphides** (zinc phosphide, aluminum phosphide) — used in some mole and gopher baits more than house rat poisons. Release toxic phosphine gas when they hit stomach acid. DO NOT induce vomiting at home — the gas is harmful to humans nearby. Treat at a vet only.
What to do right now
- Call your vet or ASPCA Animal Poison Control: (888) 426-4435 (24/7, US). Tell them the product brand, active ingredient, and approximate amount ingested.
- Find the packaging or take a photo of the label and bring it with you. The brand name alone is often not enough — same brands sell different active ingredients in different products.
- Note the time of ingestion as accurately as you can.
- If your vet directs you to induce vomiting (and the poison is NOT a phosphide), they'll tell you how. Do not improvise.
- Do not give vitamin K from home supplements — the dose and form are different from prescription vitamin K1.
What your vet will do
If you arrive within 2 hours and the poison is not a phosphide, the first step is decontamination — induced vomiting and activated charcoal. This applies to all types.
After that, treatment depends on the active ingredient. For anticoagulants, your vet will run a clotting test (PT/aPTT) immediately or 48 hours later to confirm exposure, then start vitamin K1 therapy — usually oral pills for 4–6 weeks. Recovery is excellent with timely treatment.
For bromethalin, there is no antidote. Treatment is aggressive supportive care — IV fluids, anti-seizure medications, intravenous lipid emulsion in some cases. Outcome depends on how much was ingested and how soon care started.
For cholecalciferol, treatment is days-long IV fluid support, a drug called pamidronate to lower calcium, calcitonin, and frequent blood work. This is the most expensive and labor-intensive treatment of the four.
What about secondary poisoning — if my dog ate a poisoned rat?
It can happen, especially with anticoagulant rodenticides because they persist in the rat's body. The risk is real but lower than direct ingestion of the bait. The same emergency rules apply — call your vet, especially if the rat is recently dead and your dog ate a significant portion.
Cats that hunt are at especially high risk for relay (secondary) toxicity from anticoagulant rodenticides, even from neighborhood rats that picked up bait elsewhere.
How to rat-proof your home safely if you have pets
- Use snap traps in tamper-proof bait stations, in places pets can't reach.
- If you must use bait, choose first-generation anticoagulants (which have an antidote, vitamin K1) over second-generation (brodifacoum, bromadiolone) which are more persistent.
- AVOID bromethalin and cholecalciferol around pets — these have no antidote (bromethalin) or extremely expensive treatment (cholecalciferol).
- Block off any space pets can access where you've placed bait — under sinks, in attics, garages.
- Tell your dog walker, pet sitter, and any caretaker exactly what poisons you use and where.
- If a neighbor uses rodenticides, ask what kind — pets can find baits in adjacent yards.
What not to do
- Don't wait to see symptoms — anticoagulant rodenticide bleeding starts 3–5 days after ingestion. By the time you see it, treatment is much harder.
- Don't guess at the type of poison. Different rodenticides need different treatments. Find the package.
- Don't induce vomiting for phosphide poisons (mole/gopher baits) — the gas is dangerous to humans nearby. Go directly to the vet.
- Don't give vitamin K supplements from your home medicine cabinet — the dose and form differ from prescription vitamin K1, and timing matters.
- Don't assume "a few pellets" is too small to matter. Some second-generation anticoagulants are toxic to a 50-lb dog at less than a teaspoon.
Frequently asked
How much rat poison is dangerous for a dog?
It depends on the active ingredient and your dog's weight, but every type can be dangerous at small amounts. For example, brodifacoum (common in D-Con and Tomcat) is toxic to a 50-lb dog at less than 2 grams — about a third of a typical bait block. Always assume ingestion is dangerous and call the vet.
My dog ate rat poison hours ago and seems fine — should I still worry?
Yes. Anticoagulant rodenticides (the most common type) don't cause symptoms until internal bleeding starts 3–5 days later. "Seems fine" at hour 12 means nothing for those. Call your vet — they'll run a clotting test and start preventive vitamin K1 therapy.
How do I know which type of rat poison it was?
Find the packaging or photograph the label. Look for the "Active ingredient" line — it'll say brodifacoum, bromadiolone, bromethalin, cholecalciferol, or another chemical name. Brand alone (D-Con, Tomcat) isn't enough because the same brand sells multiple formulations.
Is there a home remedy or antidote?
No. Vitamin K1 (the antidote for anticoagulant rodenticides) is prescription-only and dosed specifically for the type of poison ingested. Home vitamin supplements are the wrong form. The other rodenticide types don't have antidotes at all — treatment is supportive care at the vet.
My cat hunts and brings home dead rodents — is she at risk?
Yes, especially if neighbors use anticoagulant rodenticides. Relay (secondary) toxicity from poisoned rodents is a documented risk. Symptoms in cats can be subtle — lethargy, weight loss, occasional vomiting — over weeks. Mention rodent hunting to your vet so they know to look for it.
How long after rat poison ingestion is treatment effective?
For anticoagulants: vitamin K1 therapy works at any time before serious bleeding has begun — usually 3–5 days post-exposure is the deadline. For bromethalin and cholecalciferol: the earlier the better; decontamination within 2 hours has the biggest impact.
Can pets recover from rat poison ingestion?
Most can, with prompt treatment. Anticoagulant cases recover almost completely with vitamin K1 therapy. Cholecalciferol cases recover with aggressive fluid therapy, though kidney function may be permanently affected. Bromethalin has the highest mortality and least predictable recovery.
Double-check another food, get a personalised follow-up, or talk to CRO about your pet’s specific situation.
This guide is educational and based on US veterinary sources (ASPCA APCC, AVMA, and peer-reviewed literature). It is not a substitute for a vet call. When in doubt, phone your vet or the ASPCA Animal Poison Control — the fee is far cheaper than a delayed case.