My Dog Ate Rat Poison: What To Do

There is no such thing as rat poison. There are several, they kill in different ways, and the box in your hand decides which treatment your dog gets.

If you take one thing from this page, take this: find the packaging.

Not out of fussiness. Rat poison is not a single substance. It is several unrelated ones sold in similar-looking trays, and they poison a dog by completely different routes, on different timescales, needing completely different treatment. What works for one does nothing for another. That box, or even a photograph of it, is the most valuable thing you can carry into a veterinary practice.

What to do

1. Ring your vet or a poison line straight away, even if your dog seems perfectly well. Especially then.
2. Take the packaging. If you cannot find it, photograph the bait station, or note the brand and the colour of the pellets.
3. Go in. This is not a wait-and-see.

In the UK, the Animal PoisonLine. In the US, the Pet Poison Helpline or the ASPCA Animal Poison Control Center.

Do not try to make your dog sick unless a vet has told you to.

"It was two days ago and he seems fine"

This is the single most common thing owners say, and it is the most dangerous sentence on the subject.

Most household baits are anticoagulants, with names like warfarin, brodifacoum and bromadiolone. They work by stopping blood from clotting, so the animal bleeds internally.

Internally is the problem. There is often nothing to see. No wound, no blood, no obvious distress. And the bleeding does not start immediately: with these baits it can take several days for any sign to appear.

So the sequence plays out again and again. A dog eats bait on Monday, is completely normal all week, and collapses at the weekend. By then the owner has stopped worrying, because nothing happened. Nothing happening is exactly what this poison looks like during the phase when it is most treatable.

Ring on the day you suspect it, not the day your dog looks ill.

The other types, and why vitamin K is not a universal answer

Ask most people what rat poison does and they will describe bleeding, and think of vitamin K. That is only the anticoagulant group.

Bromethalin causes the brain to swell. It does not cause bleeding at all, and vitamin K does nothing against it. The signs are neurological from the start: lethargy, wobbliness, tremors, seizures, a dog that seems mentally not itself, and paralysis as it worsens. There is no antidote, the margin between a harmless amount and a harmful one is narrow, and cats are more sensitive again.

Cholecalciferol is concentrated vitamin D3. It drives blood calcium up and damages the kidneys. It is one of the most potent baits available and the margin of safety is very narrow. Signs typically do not appear for one to three days, and by the time they do, significant damage is often done. Watch for increased thirst and urination, weakness, loss of appetite and vomiting.

Strychnine and zinc phosphide do their own separate damage again.

You are not expected to know which is which. That is what the box is for.

Do not try to treat it at home

There is no home remedy, and giving vitamin K on the assumption that all rat poisons are the same achieves nothing while the clock runs. This is a genuinely common instinct among owners who have been through an anticoagulant poisoning before with another dog.

What you might see

With the anticoagulant baits:

• Bleeding, often internal and invisible from outside
• Bruising under the skin or on the gums
• Bleeding from the nose or gums
• Pale gums
• Weakness, wobbliness, collapse
• Coughing or laboured breathing, if bleeding into the chest

With bromethalin: lethargy, incoordination, tremors, seizures, an altered mental state, paralysis.

With cholecalciferol: increased thirst and urination, weakness, going off food, vomiting.

Pale gums or unexplained bruising in a dog with any possible access to bait should be treated as an emergency regardless of how long ago you think it happened.

Where dogs find it

Bait stations live where people do not look: hotel basements, back-of-house kitchens, outbuildings, barns and farm sheds. Coastal and rural properties tend to have more of them, and so do older buildings.

There is a second route people forget. A dog does not have to eat the bait at all. It can eat a rodent that already did, and be poisoned second-hand.

On holiday, keep dogs out of cellars, sheds and service areas, and treat any small tray of brightly coloured pellets as a hazard.

Sources

This article was written using guidance from RSPCA, the Royal Society for the Prevention of Cruelty to Animals, the UK's oldest animal welfare charity; Pet Poison Helpline, a 24/7 animal poison control service for North America; and Animal PoisonLine (VPIS), the UK's only 24/7 poison advice line for pet owners, run by the Veterinary Poisons Information Service. This guidance is for general information and does not replace a consultation with your own veterinarian. In an emergency, always contact a vet. Read [how we write our health guidance](https://rochsociety.com/how-we-write-our-health-guidance/). Last reviewed July 2026.