The authors declare no conflict of interest.
Adverse reactions from essential oil-containing natural flea products exempted from Environmental Protection Agency regulations in dogs and cats
Article first published online: 16 JUL 2012
© Veterinary Emergency and Critical Care Society 2012
Journal of Veterinary Emergency and Critical Care
Volume 22, Issue 4, pages 470–475, August 2012
How to Cite
Genovese, A. G., McLean, M. K. and Khan, S. A. (2012), Adverse reactions from essential oil-containing natural flea products exempted from Environmental Protection Agency regulations in dogs and cats. Journal of Veterinary Emergency and Critical Care, 22: 470–475. doi: 10.1111/j.1476-4431.2012.00780.x
- Issue published online: 28 AUG 2012
- Article first published online: 16 JUL 2012
- Manuscript Accepted: 2 JUN 2012
- Manuscript Received: 11 OCT 2010
- natural anti-flea preventative;
To describe adverse effects in dogs and cats exposed to Environmental Protection Agency exempted plant-derived flea preventatives containing mixtures of essential oils.
Retrospective study from 2006 to 2008.
Records of dog and cat cases were reviewed from the American Society for the Prevention of Cruelty to Animals, Animal Poison Control Center database.
Thirty-nine cats and 9 dogs with history of exposure to natural flea preventatives.
Measurements and Main Results
The following information was retrieved from each incident: number of animals, species involved, frequency, types, onset time, duration of clinical signs, exposure appropriateness, final outcome, and treatment information. Ninety-two percent of animals (n = 44) showed presence of one or more adverse effects. The frequency of adverse effects in dogs (n = 8; 89%) and cats (n = 36; 92%) was similar. Onset time of adverse effects in 39 of 44 animals occurred within 24 hours. The duration of signs in 24 animals ranged from 30 minutes to 149 hours. The products were used as per label in 77% animals (n = 37). Of 28 animals with known outcome, 50% (n = 14) recovered with bathing alone while others received intravenous fluids, muscle relaxants, and anticonvulsive medications. Death (1 cat; n = 1/28; 4%) or euthanasia (1 cat and 1 dog; n = 2/28; 7%) was reported in 3 animals.
Dogs and cats can experience significant adverse effects when exposed to plant-derived flea preventatives even when used according to label directions. The number of reports of exposure in cats was higher than dogs, but the frequency of reported adverse effects was similar between the 2 species. Agitation and hypersalivation were common in cats, whereas lethargy and vomiting were common in dogs.