Is Pennyroyal Oil Safe for Dogs?
Why it’s a problem
Pennyroyal oil contains pulegone, which is highly toxic to the liver of dogs and cats. Most cases come from owners using it as a flea repellent on the pet or its bedding. Documented poisonings include deaths even after dilute application.
How to keep your pet safe
Never use pennyroyal oil on a dog, its bedding, or its collar, and never as a flea treatment. Use proven flea control recommended by your veterinarian. If you own pennyroyal oil, keep it locked away with other chemicals.
Warning signs to watch for
Vomiting, diarrhea, drooling, lethargy, weakness, bleeding or bruising, yellow gums, seizures, collapse
When to call the vet
Contact a veterinarian or pet poison hotline immediately if there is any chance of exposure. Liver damage may take a day or more to show, so do not wait for symptoms before calling.
Common questions
Is pennyroyal oil a safe natural flea treatment for dogs?
No. It has caused fatal liver failure in dogs when used as a flea remedy. Modern veterinary flea products are far safer and much more effective.
Is the pennyroyal plant safe if my dog only sniffs it?
Casual sniffing is low risk, but chewing the plant or any contact with its oil is dangerous. It is safest to remove pennyroyal from yards and gardens a dog uses.
More essential oils hazards for dogs
This page is general educational information, not a substitute for professional veterinary advice. Every pet is different — if your animal ate or touched something concerning, contact your veterinarian or a pet poison hotline right away. In the US: Pet Poison Helpline (855) 764-7661, ASPCA Animal Poison Control (888) 426-4435 (fees may apply).