Permethrin Flea Treatment and Cat Toxicity (Cats Lack UGT1A6 Glucuronidation — Permethrin LETHAL to Cats, Dog Spot-On Products Kill Cats) — pet safety profile
Context-dependentPermethrin is the single most dangerous household chemical exposure for cats.
What is this product?
Permethrin is the single most dangerous household chemical exposure for cats. Cats lack functional UGT1A6 (UDP-glucuronosyltransferase 1A6) enzyme — the primary detoxification pathway for pyrethroids — making them 10-100x more sensitive than dogs. Dog-strength permethrin spot-on treatments (45-65% permethrin) applied to cats or transferred via contact with treated dogs cause fatal permethrin toxicosis: tremors, seizures, hyperthermia, and death within 24-72 hours without aggressive treatment. The ASPCA Animal Poison Control Center (888-426-4435) reports permethrin as the #1 cause of feline poisoning calls — estimated 2,000-3,000 cat cases annually in the US alone. UK Veterinary Medicines Directorate: 300+ cat deaths per year attributed to permethrin. LD50 in cats is not precisely established due to extreme variability, but doses as low as 100 mg/kg dermal have caused death. Most exposures occur when owners apply a dog permethrin product to their cat (misreading labels) or when cats groom dogs recently treated with permethrin spot-on. EPA mandated improved labeling in 2010 after spot-on incident reports increased 53% (2007-2008).
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