Dog Ate Rat Poison? What to Do Immediately (Dogs and Cats Guide)

By Dr Duncan Houston

Quick Answer

If your dog or cat ate rat poison, contact a veterinarian immediately. Do not wait for symptoms. Some poisons cause delayed internal bleeding that can be treated with Vitamin K1, while others affect the brain and have no antidote. Early treatment is critical.

Pets don’t hesitate. If it smells interesting or looks edible, it’s fair game.

Rat poison is one of those exposures where everything depends on timing. I’ve seen pets look completely normal after exposure, only to come back days later critically unwell. That delay is what makes it dangerous.

If there’s even a small chance your pet has eaten rat poison, act early. Waiting is where things go wrong.

What to do if your dog eats rat poison

If you think your dog has eaten rat poison, do this immediately:

1. Remove access
   Take away any remaining bait, blocks, or packaging

2. Do not wait for symptoms
   Some poisons take days before signs appear

3. Call your vet or emergency clinic
   Early treatment can prevent serious complications

4. Do not induce vomiting unless advised
   Some toxins make this unsafe

5. Bring packaging if possible
   Knowing the exact poison helps guide treatment

Why rat poison is still a risk

Rodenticides are still widely used and not all of them work the same way.

Some cause internal bleeding. Others affect the brain. Some have antidotes. Some don’t.

Pets can be exposed by:

• eating bait directly

• chewing bait stations

• eating a poisoned rat or mouse

That last one is the one many owners don’t think about.

Types of rat poison

The type of poison determines both the risk and the treatment.

Anticoagulant rodenticides

Examples include brodifacoum, bromadiolone, and warfarin

These stop blood clotting and lead to internal bleeding.
These are the ones that can be treated with Vitamin K1.

Bromethalin

Affects the brain and nervous system

Causes tremors, seizures, and neurological signs
There is no antidote

Strychnine

Causes severe muscle contractions and seizures

Fast acting and very dangerous

Zinc phosphide

Releases toxic gas in the stomach

Can cause severe illness and may pose a risk to people handling vomit

How anticoagulant rat poison works

Anticoagulant rodenticides block the recycling of Vitamin K, which is required to activate clotting factors.

At first, your pet still has working clotting factors circulating, so everything looks normal. Then those get used up.

That’s when bleeding starts.

This is why signs often appear 3 to 5 days after exposure.

Signs of rat poison poisoning

Signs are usually related to internal bleeding and can be subtle early on:

• lethargy

• weakness

• pale gums

• bruising

• nosebleeds

• bleeding from gums

• blood in urine or stool

• coughing or difficulty breathing

• collapse

Changes like pale gums or reduced energy can be easy to miss. Knowing how to check your pet at home can help you pick these up earlier.

👉 See also: How to Perform a Basic Physical Exam on Your Dog or Cat

Diagnosis

If rat poison exposure is suspected, your veterinarian will assess clotting with blood tests:

• PT (Prothrombin Time)
  The most important early test and usually the first to become abnormal

• APTT (Activated Partial Thromboplastin Time)
  Helps assess severity and progression

Diagnosis is based on these results, clinical signs, and any known or suspected exposure.

Treatment

Treatment depends on the poison and how early your pet is seen.

Anticoagulant rodenticides

• Vitamin K1 injection initially

• followed by oral Vitamin K1 for 2 to 4 weeks

• blood or plasma transfusions in severe cases

• PT recheck 48 hours after stopping treatment

That final test is essential. It confirms the toxin is no longer affecting clotting.

Non-anticoagulant poisons

There is no antidote for bromethalin, strychnine, or zinc phosphide.

Treatment focuses on:

• decontamination (if early)

• hospitalisation

• seizure control

• supportive care

Secondary poisoning

This happens when a pet eats a poisoned rodent.

It is a real risk, especially in cats and hunting dogs.

Some rodenticides remain in the rodent’s liver for weeks, meaning your pet can still be exposed without touching the bait itself.

If your pet eats a rat or mouse and poison may be in use nearby, speak to your veterinarian.

Prevention

Prevention is far easier than treatment here.

• use tamper-proof bait stations

• avoid placing bait where pets can access it

• store poisons securely

• ask pest control what product is being used

• supervise pets that hunt or scavenge

Keeping your pet controlled and supervised on outings can also reduce scavenging risks.

👉 See also: What to Pack for a Dog Day Out

Safer alternatives

If you have pets, it is worth reconsidering poison use altogether.

• snap traps placed in secure areas

• sealing entry points

• removing food sources

• improving sanitation

Less convenient, but much safer.

FAQ

What should I do if my dog ate rat poison but seems fine?

Still contact your veterinarian immediately. Many poisons have delayed effects and waiting can make treatment harder.

How long after rat poison do symptoms start?

Typically 3 to 5 days for anticoagulants. Other toxins can act much faster.

Can dogs and cats survive rat poison?

Yes, especially if treated early. Delays increase the risk significantly.

Should I make my pet vomit at home?

Only if your veterinarian instructs you to. In some cases, this can be dangerous.

Final thoughts

Rat poison is one of those situations where doing nothing is the worst option.

Some types are very treatable if caught early. Others can deteriorate quickly with very little warning.

If there is any suspicion your pet has been exposed, act early and get advice. That one decision can make all the difference.

Still unsure what to do next?

This is where most owners get stuck.

Is it safe to wait?
Do you need to go to emergency?
Is this actually serious or not?

If you’re unsure, getting quick guidance can help you make the right call early instead of second guessing.

The ASK A VET™ app gives you access to veterinary advice when you need it, so you can act with confidence rather than hope for the best.