Tea Tree (Melaleuca) Oil Cat and Dog Toxicity (Terpinen-4-ol, Cineole, Dilution-Error Topical Application, ASPCA Case Series) — pet safety profile
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Tea tree oil (melaleuca, primarily Melaleuca alternifolia distillate) is the highest-documented essential-oil exposure category in veterinary toxicology because of its dual role as a popular human topical antimicrobial and a frequently-applied 'natural' pet dermatology home remedy.
What is this product?
Tea tree oil (melaleuca, primarily Melaleuca alternifolia distillate) is the highest-documented essential-oil exposure category in veterinary toxicology because of its dual role as a popular human topical antimicrobial and a frequently-applied 'natural' pet dermatology home remedy. The active terpenes — terpinen-4-ol (30-48%), 1,8-cineole (<15%), gamma-terpinene, alpha-terpinene — are dermally absorbed in cats and dogs at rates that may produce systemic neurotoxicity within hours of topical application. The 2014 retrospective ASPCA APCC case series (Khan et al., J Am Vet Med Assoc 2014) documented 443 cats and dogs exposed to 0.1% to 100% tea tree oil; 60% of cats and 23% of dogs developed clinical signs (ataxia, depression, weakness, hypersalivation, tremor, hyperthermia). Pure-oil application (the most severe dilution error) produced acute feline ataxia and hepatic injury within 2-12 hours. Dogs are less sensitive than cats but not safe — small dogs given undiluted tea tree as a 'flea remedy' have died. Inhalation exposure from tea-tree-containing diffusers replicates the essential-oil-diffuser pattern (preceding entry) but tea tree's specific terpinen-4-ol toxicity warrants its own entry. The dominant household pattern is owner application of a few drops of pure tea tree oil to a pet's skin or coat as a 'natural' antimicrobial / flea treatment — this is the primary preventable scenario.
What's in it
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Tea Tree Oil Active
Co Occurring Terpene
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