Why it's dangerous
These substances cause harm through various mechanisms including preventing blood clotting, causing life-threatening elevations in calcium, inducing brain swelling, or releasing toxic phosphine gas in the stomach.
Toxic compound: long-acting anticoagulants, cholecalciferol, bromethalin, phosphides
How vets treat it
Treatment depends on the active ingredient. If your cat is seen soon after eating the bait, the vet may make it vomit and give activated charcoal. Anticoagulants: the antidote is prescription vitamin K1 by mouth, for about 4 weeks after long-acting baits and about 2 weeks after warfarin. If it's unclear whether your cat ate enough to matter, the vet may run a clotting test about 2 days later and treat only if it is abnormal. Bromethalin: there is no antidote, so vets clear the gut early with repeated doses of charcoal, then treat brain swelling, tremors and seizures. Vitamin D3: there is no antidote; vets give charcoal, IV fluids and drugs that lower blood calcium, and check calcium and kidney values for days to weeks. Phosphides: the vet gives antacids to cut gas production and provides supportive care such as IV fluids, stomach protectants and liver support.
Outlook
It depends on the active ingredient and how early treatment starts. Bromethalin: there is no antidote, so the outlook is best when treatment starts before signs appear; once signs start, they can last for weeks. Vitamin D3: early treatment matters. Cats whose blood calcium and phosphorus stay normal 3 to 4 days after eating the bait are not expected to become ill, but calcium deposits can cause lasting damage such as chronic kidney disease. Anticoagulants: there is an antidote, so getting to a vet early is the key, and cats that are already bleeding have a higher risk of death.
Where pets are exposed
- Rat and mouse baits (rodenticides), sold as blocks, soft baits or pellets and often placed in bait stations.
- Anticoagulant baits, such as brodifacoum, bromadiolone, difenacoum, difethialone, warfarin, chlorophacinone and diphacinone. They stop the blood from clotting.
- Bromethalin baits, now the type pets most often get into in the US. The name looks like brodifacoum or bromadiolone, but bromethalin is a different poison that attacks the brain and nerves.
- Vitamin D3 baits, listed on the label as cholecalciferol. They push blood calcium to dangerous levels.
- Mole, gopher and vole baits, often gray pellets, made with zinc phosphide. Aluminum and magnesium phosphide are also used as grain fumigants on farms.
Prevention
- Store rat and mouse poisons in a locked cupboard or shed, never next to food or pet food.
- Place bait only where pets can't reach it, inside the tamper-resistant bait station that comes with the product.
- Write down how much bait you put out and where, check often that none has moved or gone missing, and keep the package or receipt for as long as the bait is in use.
- Wearing gloves, remove dead rodents promptly so your pets can't eat them.
- If a pest control company treats your home or yard, ask which active ingredient it uses and where it puts the bait.
Good to know
Active ingredients cannot be identified by color or shape alone; the EPA registration number is the most reliable identifier for appropriate treatment.
Common questions
My dog ate rat poison but seems fine. Do I still need a vet?
Yes. Call your vet or a pet poison line now and have the package ready. Anticoagulant baits usually cause no signs for several days while clotting fails, and bromethalin is best treated before any signs appear. Starting early is safer, and usually costs far less, than treating a dog that is already bleeding or having seizures.
Is vitamin K the antidote for all rat poisons?
No. Prescription vitamin K1 works only for anticoagulant baits, such as brodifacoum or bromadiolone. Bromethalin, vitamin D3 (cholecalciferol) and phosphide baits have no antidote and are treated very differently. Bromethalin is easily mistaken for an anticoagulant because of its name, so show your vet the actual label.
Can I tell what kind of rat poison it is from the color of the bait?
No. Baits of the same color and shape can contain completely different poisons, and products with similar names can contain different ingredients. The active ingredient on the label is the reliable way to know, so keep the package or photograph the label.
Can my cat be poisoned by eating a mouse or rat that ate poison?
It's possible but rare. With anticoagulant baits, a cat would usually need to eat many poisoned rodents, so outdoor cats that hunt around farms, stables or vineyards are at higher risk. For bromethalin, research hasn't shown it, though there are a few anecdotal reports in cats. If your cat hunts where bait is used and seems unwell, tell your vet about the possible exposure.
Should I make my pet throw up after eating rat poison?
No, not unless a vet or poison line tells you to, so call them first. Making a pet vomit at home can injure the throat and stomach, and there is no safe home method for cats. With phosphide mole or gopher baits, the vomit gives off a gas that is also toxic to people. If vomiting is needed, the vet will do it safely, with medicine and good ventilation.
Sources
- Merck Veterinary Manual — Anticoagulant Rodenticide Poisoning in Animals
- Merck Veterinary Manual — Bromethalin Poisoning in Animals
- Merck Veterinary Manual — Cholecalciferol (Vitamin D3) Poisoning in Animals
- Merck Veterinary Manual — Phosphide Poisoning in Animals
- Pet Poison Helpline — Mouse and Rat Poison
- ASPCA Animal Poison Control Center — Rodenticide and Your Pet: What You Need to Know
- VCA Animal Hospitals — Anticoagulant Rodenticide Poisoning in Cats
- US Environmental Protection Agency — Safely Use Rodent Bait Products
- Pet Poison Helpline
This page is informational and is not veterinary advice. If your pet has been exposed to something risky, contact your vet or an animal poison control line right away.
