If your dog ate rat poison, call your veterinarian or an emergency animal hospital immediately. Time is the single most important factor in treatment, and even if your dog looks fine right now, many rat poisons don’t cause visible symptoms for hours or days. While you’re on the phone, gather the product packaging so you can tell the vet the brand name, active ingredient, how much your dog may have eaten, when it happened, and your dog’s approximate weight.
If you can’t reach a vet, call the ASPCA Poison Control Hotline at (888) 426-4435 or the Pet Poison Helpline at 855-764-7661. Both are available 24/7, though a consultation fee may apply.
What to Do in the First 30 Minutes
Your instinct may be to make your dog throw up. Don’t do this without professional guidance. Inducing vomiting is sometimes the right call, but it can also be dangerous depending on the type of poison, how long ago your dog ate it, and whether your dog is already showing neurological symptoms like wobbling, tremors, or confusion. If a dog isn’t neurologically stable, vomiting risks aspiration into the lungs, which can be fatal on its own.
If a veterinarian tells you to induce vomiting at home, the standard method for dogs is 3% hydrogen peroxide given by mouth at a dose of 1 to 2 milliliters per kilogram of body weight, up to a maximum of 45 milliliters. This only works in dogs, not cats. Only use regular 3% hydrogen peroxide from the drugstore, never the concentrated kind. If your vet says to come in instead, go. Don’t waste time trying home remedies.
Bring the poison packaging with you to the vet. The active ingredient determines everything about how your dog will be treated, how quickly symptoms appear, and how serious the situation is.
Why the Type of Poison Matters
Not all rat poisons work the same way, and the active ingredient on the label changes the entire picture. There are three main types your dog might encounter.
Anticoagulant Rodenticides
These are the most common type. They include ingredients like bromadiolone, brodifacoum, warfarin, and diphacinone. They work by blocking the body’s ability to use vitamin K, which prevents blood from clotting. The dangerous part is that symptoms don’t appear for 3 to 7 days after ingestion. By the time you notice bleeding from the gums, blood in the stool, lethargy, or bruising, your dog may already be in serious trouble. The delayed onset is exactly why calling a vet immediately matters, even if your dog seems perfectly normal.
The good news is that anticoagulant poisoning has an effective antidote: vitamin K1 therapy. For older, short-acting poisons like warfarin, treatment typically lasts about one week. For newer, long-acting versions (which are far more common today), treatment can last six weeks or longer, with the dose gradually tapered down to prevent relapse. Your vet will run blood clotting tests to confirm the poisoning and monitor your dog’s response to treatment.
Bromethalin (Neurotoxic)
Bromethalin is a neurotoxin, and it’s significantly more dangerous because there is no antidote. It causes swelling in the brain and spinal cord. At higher doses, dogs can develop tremors, seizures, and convulsions within 4 to 36 hours. At lower doses, the signs are more subtle: weakness, loss of coordination, and progressive paralysis that develops over 1 to 5 days.
Because there’s no antidote, treatment focuses on preventing the poison from being absorbed. If the dog gets to a vet quickly enough (ideally within four hours), vomiting can be induced and activated charcoal is given in multiple doses to bind the toxin in the gut. Dogs that are already showing neurological signs need hospitalization with medications to reduce brain swelling. This is the type of poisoning Cornell’s veterinary center specifically flags as requiring life-saving hospitalized care as soon as possible.
Cholecalciferol (Vitamin D3)
This type causes dangerously high calcium levels in the blood, which leads to kidney failure. It’s less common than the other two but extremely toxic to dogs even in small amounts. Like anticoagulant poisoning, symptoms can take a day or two to appear. Treatment requires aggressive hospitalization to bring calcium levels back down and protect the kidneys.
What Happens at the Vet
What your vet does depends on how recently your dog ate the poison and which type it was. If your dog arrives within a few hours of ingestion and isn’t showing symptoms yet, the priority is decontamination: inducing vomiting to get the poison out, followed in many cases by activated charcoal to absorb whatever remains in the digestive tract.
For anticoagulant poisoning, your vet will likely start vitamin K1 therapy and run blood clotting tests. These tests measure how long it takes your dog’s blood to clot, which is the primary way to confirm poisoning and track whether treatment is working. Clotting times don’t become abnormal until 2 to 5 days after ingestion, so your vet may send you home with vitamin K1 and schedule a follow-up test in a few days.
For bromethalin or cholecalciferol poisoning, expect hospitalization. Dogs with bromethalin toxicity may need IV medications to reduce brain swelling, anti-seizure drugs, and close neurological monitoring. Dogs with cholecalciferol poisoning need IV fluids and medications to lower blood calcium. Hospital stays of several days are common for both.
Treatment costs can exceed $2,000, and some cases require weeks of follow-up medication and supportive care. The financial reality is worth knowing upfront so you can discuss payment options with the clinic right away rather than delaying treatment.
What If You Didn’t See Your Dog Eat It
Many cases of rat poison exposure are discovered late, either because the owner finds chewed packaging, notices green or blue dye around the dog’s mouth, or only becomes concerned when symptoms appear days later. If your dog is suddenly lethargic, bleeding from the nose or gums, coughing, having trouble walking, or seems weak for no clear reason, rat poison exposure should be on the list of possibilities, especially if bait stations are anywhere in or around your home, garage, barn, or neighborhood.
Vets can diagnose anticoagulant poisoning through blood clotting tests even without a confirmed exposure history. For bromethalin, diagnosis is harder and usually based on neurological signs combined with the possibility of exposure. If you’re not sure what your dog ate but they’re deteriorating rapidly, get to a vet without waiting. Bring any suspicious packaging or bait fragments you can find.
Recovery and What to Watch For
Dogs treated early for anticoagulant poisoning generally do well. The vitamin K1 therapy is highly effective when started before significant bleeding occurs. The key is completing the full course of treatment, which can last six weeks for long-acting poisons. Stopping early risks a dangerous relapse as the poison outlasts the medication. Your vet will typically check clotting times about 48 to 72 hours after the last dose of vitamin K1 to make sure your dog’s body is clotting normally on its own.
Recovery from bromethalin poisoning is less predictable. Dogs that receive decontamination before neurological signs develop have the best outcomes. Once brain swelling and nerve damage set in, recovery can be slow and incomplete. Some dogs experience lasting neurological effects.
During recovery from any type of rat poison exposure, restrict your dog’s activity to prevent injuries, since even minor bumps can cause dangerous internal bleeding in dogs with clotting problems. Watch for pale gums, unusual tiredness, difficulty breathing, blood in urine or stool, and any swelling or bruising. Keep your dog away from any areas where bait may still be accessible, and consider switching to pet-safe pest control methods like enclosed electronic traps that don’t use chemical bait.