Dog Ate Rat or Mouse Poison: What to Do

Rat and mouse poisons are among the most lethal toxins a dog can swallow — and unlike chocolate or grapes, the danger often does not show up for days. The action you take in the first hour, before symptoms appear, decides the outcome. This guide walks through exactly what to do, how to identify which type of rodenticide your dog ate, and what role activated charcoal plays in the response.

Emergency phone numbers — call before doing anything else:
  • ASPCA Animal Poison Control Center: 1-888-426-4435 ($95 consultation fee)
  • Pet Poison Helpline: 1-855-764-7661 ($89 consultation fee)

Critical safety warning — read this first. If the bait packaging mentions zinc phosphide or aluminum phosphide (sold under brand names such as ZP, Gopher Getter, or Eraze), a dog that vomits will release phosphine gas, which is highly toxic to humans. Do not transport the dog in a closed car with the windows up. Keep the dog outdoors or in a well-ventilated area until you reach the veterinary hospital, and warn the clinic ahead of arrival.

What to do in the next hour

  1. Call ASPCA Animal Poison Control or the Pet Poison Helpline before you do anything else. They will ask for the active ingredient, your dog's weight, and the time of ingestion, and they will tell you whether to induce vomiting, give activated charcoal, or transport immediately. Both services issue a case number that your veterinarian will use to coordinate treatment.
  2. Find the bait package, wrapper, or container. Look on the label for the active ingredient (the chemical name in small print) and the EPA registration number. The active ingredient determines the entire treatment plan. If you cannot find the package, photograph any remaining bait — the color, shape, and size are clues.
  3. Note the time of ingestion as precisely as you can. Activated charcoal is most effective within the first hour and useful up to about six hours. For some rodenticides, the timing window for inducing vomiting closes after 30 to 60 minutes.
  4. Do not induce vomiting on your own. Hydrogen peroxide is no longer recommended by most veterinary toxicology sources because it causes esophageal burns and aspiration pneumonia, and it is dangerous for cats. With phosphide rodenticides, inducing vomiting in a confined space releases toxic gas. Wait for instructions from poison control.
  5. Give activated charcoal only if poison control or your veterinarian directs you to. Activated charcoal binds most rodenticide active ingredients in the gut before they enter the bloodstream. With bromethalin specifically, multiple doses are often required because the toxin recirculates between the gut and the liver. A pre-mixed, dial-a-dose product such as PawMergency lets you administer the right amount without measuring or mixing while you transport to the clinic.

Identify the type of rat poison your dog ate

There are four chemical classes of rodenticide sold in the United States today. Each one works through a different mechanism, follows a different timeline, and requires a different treatment. Identifying the active ingredient on the package is the single most useful thing you can do for your veterinarian.

Active ingredient How it kills Symptom onset Antidote available? Activated charcoal helpful?
Anticoagulants (brodifacoum, bromadiolone, difethialone, warfarin, chlorophacinone, diphacinone) Blocks vitamin K1 recycling, preventing the body from making clotting factors. Internal bleeding follows. 3 to 5 days delayed Yes — vitamin K1 (phytonadione), 21 to 30 days for second-generation products Yes — binds well; standard early decontamination
Bromethalin Neurotoxin. Disrupts ATP production in nerve cells, causing brain swelling. 2 to 24 hours acute, up to 7 days delayed No Yes — and multiple doses are recommended because of enterohepatic recirculation
Cholecalciferol (vitamin D3) Causes severe hypercalcemia, leading to acute kidney failure. 18 to 36 hours No direct antidote — treatment is aggressive IV fluids, calcium-lowering drugs, sometimes pamidronate Useful early, before absorption is complete
Zinc or aluminum phosphide Releases phosphine gas in the stomach, which damages the heart, lungs, and liver. Vomited gas is also toxic to humans nearby. 15 minutes to 4 hours No May help bind unreacted phosphide, but ventilation and supportive care are the priority

Common consumer brand names map to these classes as follows: d-CON and Tomcat products may contain bromethalin or first-generation anticoagulants depending on the formulation; Just One Bite typically contains bromadiolone (a second-generation anticoagulant); Final Blox contains brodifacoum; Terad3 contains cholecalciferol; ZP Tracking Powder and Gopher Getter contain zinc phosphide. Always check the label rather than relying on brand recognition — manufacturers reformulate, and the active ingredient is what matters.

Symptoms timeline by rodenticide type

One reason rat poison is so deadly is that an exposed dog often looks completely normal for hours or days while the toxin works. Do not wait for symptoms to appear before seeking care.

  • Anticoagulants: Symptoms typically appear 3 to 5 days after ingestion. Watch for lethargy, weakness, pale gums, coughing or coughing up blood, blood in the stool or urine, unexplained bruising, swollen abdomen, or sudden collapse. By the time these signs appear, internal bleeding is already advanced.
  • Bromethalin: A high-dose ingestion can cause tremors, seizures, hyperexcitability, and hyperthermia within 2 to 24 hours. A lower dose may cause a delayed paralytic syndrome 1 to 7 days later, with hindlimb weakness, ataxia, and progressive paralysis. Cats are more sensitive than dogs.
  • Cholecalciferol: Symptoms appear within 18 to 36 hours. Early signs are increased thirst and urination, lethargy, anorexia, and vomiting. Kidney injury follows quickly.
  • Zinc or aluminum phosphide: Onset is fast, typically within 15 minutes to 4 hours. Signs include vomiting (often with a garlic or fishy odor), abdominal pain, restlessness, weakness, difficulty breathing, and seizures.

What if my dog ate a poisoned rodent instead of the bait directly?

This is called secondary or relay poisoning, and it is more common than most owners realize — especially in households where a neighbor or pest control company sets bait nearby. The risk depends on the rodenticide class. Second-generation anticoagulants such as brodifacoum and bromadiolone persist in rodent tissue for weeks and pose the greatest secondary risk to dogs and cats. Bromethalin and cholecalciferol accumulate to a lesser degree but can still cause toxicity in small dogs that consume multiple poisoned rodents. First-generation anticoagulants and phosphides break down faster and present lower secondary risk.

Treat secondary poisoning as you would direct ingestion: call poison control, identify the bait used in your area if possible, and do not wait for symptoms.

Why veterinarians use activated charcoal, not hydrogen peroxide

For decades, owners were told to give hydrogen peroxide to make a dog vomit after a suspected poisoning. The clinical evidence has moved against that practice. A 2012 study in the Journal of the American Veterinary Medical Association by Khan and colleagues documented gastric ulceration, esophagitis, and aspiration pneumonia in dogs given 3% hydrogen peroxide as an emetic. Beyond the tissue damage, vomiting only recovers a portion of what the dog ate — what remains in the gut keeps absorbing.

Activated charcoal works on a different principle. Its enormous surface area binds toxin molecules in the digestive tract before they cross into the bloodstream. The bound toxin then passes harmlessly out of the body in the stool. There is no vomiting, no aspiration risk, and no esophageal damage. For most rodenticides — and especially for bromethalin, where multiple doses are recommended because of enterohepatic recirculation — activated charcoal is the standard early decontamination tool. For more on this, see our full comparison of hydrogen peroxide versus activated charcoal in dogs.

About PawMergency activated charcoal paste

PawMergency is a veterinarian-formulated activated charcoal and kaolin clay paste, pre-mixed in a dial-a-dose oral syringe. It is dosed at 1mL per pound of body weight and is approved for dogs and cats. Active ingredients are coconut-shell-derived activated charcoal at 200mg/mL plus kaolin clay at 200mg/mL. The product is manufactured in an FDA-registered, NASC-certified, GMP facility in the United States and is third-party tested. Three years of shelf life means a tube kept in a first-aid kit, glove box, or kitchen drawer will be ready when needed.

PawMergency is not a substitute for veterinary care. It is a bridge — a way to begin decontamination immediately while you contact poison control and transport your pet to a clinic. For rat and mouse poison specifically, the first call should always be to ASPCA Animal Poison Control or the Pet Poison Helpline.

What our veterinary panel says

"PawMergency Activated Charcoal Gel is a must-have for every dog and cat first-aid kit. This third-party tested, easy-to-use gel features weight-based dosing — simply dial and dispense for accurate administration. Activated charcoal helps bind certain toxins, while kaolin clay supports toxin binding in cases of dietary indiscretion when given promptly after ingestion. For best outcomes, contact your veterinarian or ASPCA Animal Poison Control Center immediately after any suspected toxin exposure."

Dr. Wendy Asato, DVM— Wendy Asato, DVM, Kailua, Hawaii

"When your pet gets into something they shouldn't, having PawMergency on hand can make a critical difference. This coconut shell activated charcoal and kaolin clay gel from Vetanica comes pre-mixed in a no-mess syringe with a weight-based dial — dose at 1cc per pound of body weight and administer straight from the tube. Activated charcoal works not as an antidote, but by binding certain toxins within the gut so they can't cross into the bloodstream, making speed of administration essential. Kaolin clay adds gut-calming support for everyday digestive mishaps."

Dr. Joseph Menicucci, DVM, MBA— Joseph Menicucci, DVM, MBA

"In emergency situations, timing is everything — especially when a pet ingests something potentially toxic. Having PawMergency readily available gives pet owners a practical way to act during those critical first moments. This pre-mixed activated charcoal and kaolin clay gel comes in an easy-to-use, weight-based dosing syringe, allowing for quick and accurate administration at 1cc per pound. While it's not a complete substitute for veterinary care, it serves as a valuable first-response tool to help bridge the gap before veterinary care can be provided."

Dr. Kylie Galla, DVM— Kylie Galla, DVM

Frequently asked questions

What should I do if my dog ate rat poison?

Call ASPCA Animal Poison Control at 1-888-426-4435 or the Pet Poison Helpline at 1-855-764-7661 immediately, before doing anything else. Find the bait package and read the active ingredient on the label. Note the time of ingestion as precisely as you can. Do not induce vomiting on your own. Activated charcoal can be given if poison control or your veterinarian approves it, and you should transport your dog to a veterinary clinic right away.

How quickly will rat poison kill a dog?

It depends on the type. Zinc or aluminum phosphide can cause death within hours. Cholecalciferol (vitamin D3) typically causes kidney failure within 18 to 36 hours. Anticoagulants kill more slowly — internal bleeding usually begins 3 to 5 days after ingestion. Bromethalin can be acute or delayed up to a week. Because the lethal window varies so widely, treat every suspected ingestion as urgent regardless of how your dog looks at the moment.

How do I know which type of rat poison my dog ate?

Read the active ingredient on the bait package or wrapper — it is printed in small text on the label, often near an EPA registration number. The four classes are anticoagulants (brodifacoum, bromadiolone, warfarin, and similar), bromethalin, cholecalciferol (vitamin D3), and zinc or aluminum phosphide. Brand names like d-CON and Tomcat cover multiple chemical classes depending on the formulation, so always go by the active ingredient rather than the brand.

Can a small amount of rat poison hurt my dog?

Yes, especially in small dogs. Toxic doses are calculated per kilogram of body weight, so a 10-pound dog reaches a dangerous dose with far less bait than a 70-pound dog. Second-generation anticoagulants and bromethalin are particularly potent — even a single block of bait can be lethal to a small dog. Always assume that any amount is potentially toxic until poison control confirms otherwise.

Will activated charcoal work for rat poison?

Activated charcoal binds well to most rodenticide active ingredients, including anticoagulants, bromethalin, and cholecalciferol when given within the first few hours after ingestion. With bromethalin specifically, multiple doses of activated charcoal are recommended because the toxin recirculates between the gut and the liver. Activated charcoal is less effective for phosphide rodenticides, where ventilation and supportive care take priority. Always confirm with poison control before administering anything at home.

What if my dog ate a poisoned rat or mouse instead of the bait directly?

This is called secondary or relay poisoning and it is treated the same way as direct ingestion. Second-generation anticoagulants like brodifacoum and bromadiolone persist in rodent tissue for weeks, posing the highest secondary risk. Bromethalin and cholecalciferol can also accumulate when a dog eats multiple poisoned rodents. Call poison control, try to determine what bait is in use in your neighborhood if possible, and do not wait for symptoms.

Should I induce vomiting if my dog ate rat poison?

Not on your own. Hydrogen peroxide causes esophageal burns and aspiration pneumonia and is no longer recommended by most veterinary toxicology sources. With phosphide rodenticides, induced vomiting in an enclosed space releases toxic phosphine gas that can harm humans nearby. Let poison control or a veterinarian decide whether and how to induce vomiting, typically using injectable medications administered at the clinic.

How long do dogs need treatment after eating rat poison?

It depends on the rodenticide. Second-generation anticoagulants require 21 to 30 days of vitamin K1 therapy because the toxin remains in the body that long. First-generation anticoagulants need about 14 days of treatment. Bromethalin and cholecalciferol have no antidote, so treatment is supportive and the length depends on how the dog responds. Phosphide poisoning is acute — survivors are usually out of the hospital within a few days, but the first 24 hours are critical.

Sources and further reading

  • DeClementi C, Sobczak BR. Common Rodenticide Toxicoses in Small Animals. Vet Clin North Am Small Anim Pract. 2018;48(6):1027-1038. doi:10.1016/j.cvsm.2018.06.006
  • Scotti KM, Levy NA, Thomas A, Pfeifer J, Garcia N, Koenigshof A. Retrospective evaluation of the effects and outcome of bromethalin ingestion: 192 Dogs (2010-2016). J Vet Emerg Crit Care. 2021;31(1):94-98. doi:10.1111/vec.13026
  • Khan SA, McLean MK, Slater M, Hansen S, Zawistowski S. Effectiveness and adverse effects of the use of apomorphine and 3% hydrogen peroxide solution to induce emesis in dogs. J Am Vet Med Assoc. 2012;241(9):1179-1184. doi:10.2460/javma.241.9.1179
  • ASPCA Animal Poison Control Center: aspca.org/pet-care/animal-poison-control
  • Pet Poison Helpline: petpoisonhelpline.com
  • Merck Veterinary Manual — Rodenticide Poisoning in Animals

Related Vetanica guides

This guide is for informational purposes and is not a substitute for veterinary care. PawMergency is a bridge product designed to support immediate first-aid response while you contact your veterinarian or animal poison control. Always consult ASPCA Animal Poison Control (1-888-426-4435) or the Pet Poison Helpline (1-855-764-7661) before administering any treatment at home.