Pyrethroid and Pets
Find out if Pyrethroid is toxic to dogs and cats.
Think your pet ate something toxic?
Call ASPCA Animal Poison Control Center: (888) 426-4435 or view emergency guide
Pyrethroids are synthetic insecticides that are especially dangerous to cats. Products containing permethrin and related compounds are commonly used to kill fleas, ticks, and mosquitoes on dogs, in yards, and around homes. Because cats lack the enzymes needed to break down these chemicals efficiently, exposure through direct application, contact with a recently treated dog, or environmental overspray can rapidly lead to serious or fatal poisoning.
Exposure can happen when a cat is accidentally treated with a dog-only spot-on product, grooms a treated dog, walks through a sprayed yard, or rests on treated bedding. In dogs, toxicity is more often dose-related and may follow heavy use of sprays, dips, or misuse of concentrated products. Early signs include drooling, vomiting, tremors, weakness, and uncoordinated movement; severe cases can progress to seizures, fever, and trouble breathing.
Never use canine flea or tick products on cats, and keep all pets separated until topical treatments are fully dry. Read labels carefully, use only species-appropriate, veterinary-recommended products at the correct dose, and avoid reapplying more frequently than directed. Store pesticides locked away, and apply sprays or yard treatments when pets are not present; ventilate indoor areas and allow surfaces to dry before allowing pets back.
If you suspect your pet has been exposed to a pyrethroid, seek immediate veterinary help. Quick decontamination and supportive care can greatly improve outcomes.
Is Pyrethroid Toxic to Dogs?
Pyrethroids can cause drooling, vomiting, tremors, seizures, and weakness in dogs; risk is highest with concentrated sprays, dips, or misuse of products labeled for other species.
Is Pyrethroid Toxic to Cats?
Cats are highly sensitive to pyrethroids, especially permethrin; even small amounts from dog spot-ons, sprays, or environmental overspray can cause life-threatening tremors, seizures, and death.
Active Ingredients
- permethrin
- cypermethrin
- deltamethrin
- phenothrin
- tetramethrin
- bifenthrin
Pest Targeted
- fleas, ticks, mites, mosquitoes
Formulation
sprays, spot-on treatments, shampoos, collars, yard and home insecticides
Signal Word
danger
Application Area
pet, home, garden
EPA Registration Number
EPA Reg. No. varies by product
Symptoms to Watch For
- hypersalivation
- vomiting
- tremors
- muscle twitching
- ataxia
- seizures
- hyperthermia
- depression
- weakness
- dyspnea
What If My Pet Was Exposed to Pyrethroid?
Remove your pet from the treated area, prevent grooming or licking, wipe the coat and paws with a damp cloth, do not induce vomiting unless instructed, and contact a veterinarian or poison control immediately.
Sources
Vet's Note
PetPilot provides general information for educational purposes. While we reference authoritative veterinary organizations, this page has not been individually reviewed by a veterinarian for your specific pet. Individual animals may react differently based on age, weight, breed, health conditions, and amount consumed. Always consult your veterinarian or a poison control center for personalized advice, especially if your pet is ill, injured, pregnant, nursing, or on medication.