Peer-reviewed veterinary case report
Horse showing signs of chlorfenapyr poisoning
By Simões, B P et al.·Published in Journal of equine veterinary science·2025·Veterinary Clinic Department, Brazil·View original on PubMed →
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Original publication title: Suspected chlorfenapyr poisoning in a horse.
- Species:
- horse
Plain-English summary
A 4-year-old Quarter Horse mare was brought to the vet after showing signs of excessive sweating, rapid breathing, and muscle twitching, which developed a day after her paddock was sprayed with a pesticide called chlorfenapyr. The horse had some initial issues with her kidney and liver function, but after receiving supportive care including IV fluids, pain relief medication, and cold-water showers, she started to improve. Fortunately, she was discharged from the hospital without any further problems.
People also search for: horse pesticide poisoning symptoms · chlorfenapyr effects on horses · horse sweating and breathing problems treatment
Abstract
Chlorfenapyr is a pesticide that interferes with mitochondrial function, leading to cell death and mortality. Although poisoning is primarily documented in humans and dogs, it can result in severe clinical signs, including sweating, respiratory distress, and neurological dysfunction. This report describes the clinical and laboratory findings of a horse with suspected accidental intoxication with chlorfenapyr. A 4-year-old Quarter Horse mare was referred to the veterinary hospital with signs of excessive sweating, hyperthermia, tachypnea, muscle fasciculation, and fearful facial expression. The clinical signs appeared a day after the paddock where the horse grazed was sprayed with chlorfenapyr for caterpillar control. Despite initial abnormalities in renal and liver profiles in the serum biochemistry analysis, the horse responded positively to supportive treatment with intravenous fluid therapy, sodium dipyrone (25mg/kg QID), and cold-water showers, showing improvement in clinical parameters, and was discharged without further complications.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/39924083/