Is rat poison toxic to cats?
Yes. Rat and mouse poisons are designed to kill mammals, and the main types cause internal bleeding, brain swelling or kidney failure. Signs are often delayed by hours to days, by which time treatment is harder. Go to a vet now and take the packet: the active ingredient decides the treatment, and products that look alike can contain completely different poisons.
General information, not veterinary advice. If your pet may have eaten this, contact a vet now; do not wait for signs.
What to do right now
- Go to a vet or emergency clinic now, even if your cat seems well
- Take the packet, or photograph the label and active ingredient
- If you cannot find the packet, note the brand and the colour and shape of the bait
- Keep your cat quiet and indoors so you can watch it
- Do not try to make your cat sick at home
Go to an emergency clinic now if
- Your cat ate or chewed bait, or you found bait chewed open
- You do not know which poison it was
- Weakness, pale gums or breathing difficulty
- Bleeding from the nose or gums, bruising or blood in the stool
- Wobbling, weak back legs, tremors or seizures
- Excessive thirst, vomiting or not eating in the days after
Who to call
Your own vet first. If they are closed, the nearest emergency or out-of-hours clinic.
In the United States
Both answer 24 hours a day and may charge a consultation fee.
Signs to watch for
| Sign | Usually starts |
|---|---|
| Wobbling, weak back legs, tremors (bromethalin) | 2 hours to several days |
| Seizures, paralysis (bromethalin) | Hours to 5-7 days |
| Excessive thirst and urination, vomiting (vitamin D3) | 1-3 days |
| Lethargy, pale gums, breathing difficulty (anticoagulant) | 3-7 days |
| Bruising, nosebleeds, blood in stool (anticoagulant) | 3-7 days |
| Vomiting, bloated belly, collapse (phosphide) | Variable, can be fast |
Why does the type of rat poison matter so much?
Rodenticides is the umbrella term for rat and mouse poisons, and the main types work in completely different ways. A vet treats each one differently, and the Pet Poison Helpline stresses that products with similar names and colours can contain different poisons. The active ingredient on the label, or in the US the EPA registration number, is the single most useful thing you can bring.
| Type | What it does | When signs usually appear | Treatment |
|---|---|---|---|
| Anticoagulants (for example brodifacoum, bromadiolone, difenacoum) | Stop blood clotting, causing internal bleeding | 3-7 days | Antidote available, given for weeks |
| Bromethalin | Swells the brain | 2 hours to several days | No antidote |
| Cholecalciferol (vitamin D3) | Raises blood calcium, damaging the kidneys | 1-3 days | No antidote; hospital care |
| Zinc or aluminium phosphide | Releases a toxic gas in the stomach | Can be rapid | No antidote |
Are cats more at risk than dogs?
It depends on the poison. Cats seem to resist anticoagulants better than dogs, according to the Pet Poison Helpline, but they are more sensitive to bromethalin and are affected at lower doses. VCA notes that cats show signs at any toxic dose of bromethalin, and that there are no safe ways to make a cat vomit at home. International Cat Care reports that rodenticides are the pesticides most often involved in cat poisonings.
How much rat poison is dangerous for a cat?
It depends on the active ingredient, its strength and your cat's weight, which is exactly why the packet matters. Some poisons have a narrow margin between a harmless and a fatal amount. Treat any chewed bait as an emergency until a vet has checked the product.
What will the vet do?
If your cat was seen eating bait recently, the vet will usually make it vomit with an injection and give activated charcoal. What follows depends on the type. For anticoagulants, the vet gives an antidote for several weeks and checks clotting with a blood test after the course; cats that are bleeding may need a transfusion. For bromethalin, there is no antidote, so early decontamination and supportive care are everything; VCA describes the outlook as poor once seizures or paralysis appear.
How do I keep my cat safe from rat poison?
Use traps or professional pest control that keeps bait in locked, tamper-resistant stations, and ask neighbours, farms and stables nearby what they use. Keep spare bait sealed and out of reach, and check regularly that no bait has spilled or been dragged out of its station. If you move into a new home, ask whether poison was laid in the loft, garage or garden. Pativo treats rat poison as an emergency in every species, as described on the emergency signs page. For dogs, see rat poison in dogs.
Questions owners ask
Can my cat be poisoned by eating a poisoned mouse?
It is possible but uncommon; VCA notes a cat would usually need to eat many poisoned rodents. If your cat hunts where poison is used and becomes unwell, tell your vet.
My cat seems fine. Can I wait and see?
No. Most rodenticides cause no signs for hours or days, and treatment works best before that. The vet may start treatment or blood tests based on the exposure alone.
What should I tell the vet if I have no packet?
The brand, where the bait was placed, its colour and shape, how much is missing and when your cat could have eaten it.
Sources
- Pet Poison Helpline: Mouse and Rat Poisons
- VCA Animal Hospitals: Anticoagulant Rodenticide Poisoning in Cats
- VCA Animal Hospitals: Bromethalin Rodenticide Poisoning in Cats
- International Cat Care: Cats and Poisons
Checked against the sources listed on this page. How we write and check these pages