Rodenticide Poisoning in Dogs: Anticoagulant Rat Bait Emergency
⚠ Toxicity Profile
| Scientific Name | Brodifacoum, Bromadiolone, Warfarin (Anticoagulant Rodenticides) |
|---|---|
| Toxic Principles | Vitamin K Epoxide Reductase Inhibitors (Anticoagulants) |
| Danger Level | Extreme (Delayed Emergency) |
| Toxic Dose Limit | 1 mg/kg |
| Target Organ | Blood (Coagulation System — Internal Bleeding) |
Anticoagulant rodenticides are the most common cause of severe poisoning in dogs reported to the ASPCA Animal Poison Control Center. These compounds inhibit Vitamin K epoxide reductase, an enzyme essential for recycling Vitamin K. Without active Vitamin K, the liver cannot produce functional clotting factors (II, VII, IX, X) — the blood's ability to clot progressively fails.
Generational Potency
First-generation (warfarin, chlorophacinone): Lower potency, shorter half-life. Second-generation (brodifacoum, bromadiolone, difethialone): High potency, single-feed lethal dose, half-life of 20-130 days in the liver — a single ingestion can cause bleeding for weeks. Second-generation baits are the current standard in consumer rodenticide products.
The Delayed Danger
Symptoms do not appear for 2-5 days after ingestion — the time required for existing clotting factors to be consumed. By the time symptoms appear, severe internal bleeding is already occurring. Signs include: lethargy and weakness, pale gums, coughing blood (hemoptysis), blood in urine or stool, nosebleeds (epistaxis), large bruises from minor contact, labored breathing (blood in chest cavity), sudden collapse.
Treatment Window
If ingestion is witnessed, immediate decontamination (induce vomiting, activated charcoal) followed by Vitamin K1 supplementation for 2-4 weeks is typically curative. The antidote (Vitamin K1) is highly effective if started before bleeding begins. Once clinical bleeding has started, whole blood or plasma transfusion may be required in addition to Vitamin K1.
🔬 Pet Toxicity Risk Evaluator
Enter your pet's weight and the estimated amount consumed to assess toxicity risk — calculated locally in your browser.
🚨 If Your Pet Has Been Exposed
DO NOT WAIT for symptoms to appear. Contact your veterinarian or the ASPCA Animal Poison Control Center at (888) 426-4435 immediately. Have your pet's weight, the substance involved, estimated amount consumed, and time of ingestion ready. The risk calculator above is an educational estimate only — individual animal responses vary based on age, breed, pre-existing conditions, and concurrent substance ingestion.