Household danger · 2 min read

Is Rat poison dangerous for cats?

No — dangerous

No. Rodenticides cause severe internal bleeding (anticoagulant types), brain swelling, or kidney failure depending on the active ingredient. Cats can be exposed by eating bait or by eating a poisoned rodent.

If your cat has just eaten rat poison

  1. Identify the active ingredient on the packaging — this is crucial for treatment.
  2. Call your vet immediately.
  3. If you can't reach a vet, call Animal PoisonLine (01202 509000) — paid triage, 24/7.
  4. Do not wait for symptoms — anticoagulant poisoning can have a 3–7 day delay before bleeding starts, but treatment is most effective when started early.

What's the full picture?

Most UK rodenticides are anticoagulants (bromadiolone, difenacoum, brodifacoum, flocoumafen) — they prevent blood clotting, causing internal bleeding after several days. A cat eating even a small amount of bait, or eating a poisoned mouse, is at risk.

Other rodenticides include cholecalciferol (vitamin D3, causing calcium rise and kidney failure), bromethalin (brain swelling), and alpha-chloralose (a different neurological toxin).

Treatment depends on which rodenticide was used — always bring the packaging or a photo of the label.

UK-permitted rodenticides (bromadiolone, difenacoum, brodifacoum) are all anticoagulant compounds requiring vitamin K1 treatment over weeks. VPIS maintains current UK product coverage and recommends blood coagulation testing to confirm exposure.

Symptoms to watch for

0–48 hours
Usually no visible signs with anticoagulant rodenticides.
3–7 days
Weakness, pale gums, bleeding from gums or nose, blood in urine or stool, difficulty breathing (internal bleeding).
Varies
Bromethalin causes tremors and seizures within 2–24 hours; cholecalciferol causes increased thirst and kidney failure signs within 24–48 hours.

If you're worried right now

Call your vet or out-of-hours emergency vet first. For poison advice, the Animal PoisonLine (UK) is on 01202 509000 — 24/7, charges apply. Your vet can also call the Veterinary Poisons Information Service (VPIS) directly.

Antifreeze (ethylene glycol) no Fertiliser caution Mothballs no Slug pellets no Vitamin D supplements (cholecalciferol) no Weed killer (glyphosate) no

About this guidance

Every entry on this site is compiled from published UK veterinary toxicology sources — International Cat Care, Veterinary Poisons Information Service (VPIS) references, RCVS-registered practice materials, and peer-reviewed feline medicine literature. Where the evidence is mixed, we err on the cautious side because cats are unusually sensitive to many common substances that are harmless to humans and even to dogs.

This is general information written for UK cat owners. It is not personalised veterinary advice for your specific cat, their age, weight, medical history, or the exact exposure you're dealing with. If your cat has eaten something or is unwell, call your vet first. The Animal PoisonLine on 01202 509000 is available 24/7 for a small fee and can tell you whether an emergency visit is needed.

Entries are reviewed and updated as new research emerges. Spotted an error? Let us know — corrections are investigated and applied within 24 hours. For more context on how we work, see about and our full disclaimer.

Last reviewed: · By the What Can My Cat Eat? editorial team

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