How To Tell If Your Cat Ate Rat Poison

Rats and mice are not only a major nuisance, but they can transmit disease and cause serious illness. When signs of rats or mice appear, most homeowners act quickly. Snap traps, glue traps, and especially rodenticides are common go-tos — but rodenticides can be very dangerous for pets and wildlife. Cats are a primary concern because they hunt rodents and can be poisoned secondarily.

It’s important to know the signs and symptoms of rodenticide poisoning in your cat. Even if you’re not using poison, a neighbor might be — and outdoor cats can easily catch a poisoned rodent.

If you think your cat has ingested rat poison, see a vet immediately. Symptoms vary by poison, but common signs include:

• Bruising easily
• Bleeding or pale gums
• Blood in urine, feces, or vomit
• Weakness or lethargy
• Staggering or unsteady gait
• Labored breathing (blood in the chest)
• Enlarged abdomen (possible internal bleeding)

Seek medical treatment or call Poison Control right away:

Poison Control: 1-800-222-1222
Pet Poison Helpline: 855-764-7661

Below are the main types of rodenticides and what to watch for.

Bromethalin

Bromethalin causes swelling of the brain. Unlike anticoagulants (ACR), it does not affect clotting and cannot be treated with vitamin K1. Symptoms may appear within 2–36 hours.

Some brands: Bell, Neogen, Motomco

Common symptoms:

• Lethargy, anxiety
• Tremors or shaking
• Decreased appetite
• Impaired movement/coordination
• Hind-leg paralysis
• Vomiting
• Seizures
• Coma or death (severe cases)

Treatment:

May include induced vomiting, activated charcoal, cathartics, IV fluids, and medications for seizures/muscle tremors. Treatment can take weeks — early care helps.

ACR (Anticoagulant Rodenticides)

These prevent blood from clotting and cause internal bleeding. Symptoms often appear 3–5 days after ingestion unless the cat has been exposed repeatedly.

Some brands: Bell, Generation, JT Eaton, Final Strike, Rodex, Havoc, Talon

Treatment:

Prescription vitamin K1 from your vet is the standard treatment — typically for up to 30 days. OTC vitamins will not work.

Cholecalciferol (Vitamin D₃)

One of the most dangerous types — even small amounts can be lethal. It can cause high calcium levels and kidney failure.

Some brands: d-CON, Quintox, Motomco, Bell

Common symptoms:

• Lethargy/weakness
• Decreased appetite
• Increased thirst and urination
• Bad breath
• Tremors
• Kidney failure and death (severe cases)

Treatment:

No direct antidote. Vets use aggressive IV fluids and supportive care to bring calcium back to normal. Hospitalization (often several days) is common.

Phosphides

Often used for gophers/moles. In the stomach they make a toxic gas — the vomit itself can be dangerous to people in unventilated areas.

Some brands: Motomco, Prozap

Common symptoms:

• Excess drooling
• Stomach bloating/pain
• Weakness/collapse
• Seizures
• Vomiting
• Possible liver damage

Treatment:

Do not feed your cat — food increases toxic gas. Seek emergency care immediately. Vets may induce vomiting, pump the stomach, give antacids, and use IV fluids.

How to Prevent Rat Poisoning

1. Avoid rodenticides.
Choose non-toxic, pet-safe rodent control whenever possible.

2. Place traps out of reach.
Cats are agile and curious — think like a cat when you place traps.

3. Enclose where needed.
If you must use poison, enclose it so rats can enter but cats can’t.

4. Monitor your cat.
Any sudden behavior change = call your vet.

A Safe Alternative

Goodnature’s A24 Automatic Rat & Mouse Trap is non-toxic, quick-kill, and safe to use around pets and kids. It removes rodents without putting your cat at risk of secondary poisoning.