{"hq_id":"hq-p-pet-000051","name":"Pet Flea Shampoo (Pyrethrin/Pyrethroid-Based)","category":{"primary":"pet_care","secondary":"pest_control","tags":["flea shampoo","pyrethrin","pyrethroid","permethrin","cat toxicity","bath treatment"]},"product_tier":"PET","overall_risk_level":"high","description":"Medicated flea shampoos containing pyrethrins (natural) or pyrethroids (synthetic: permethrin, cypermethrin). Dog flea shampoos containing permethrin are LETHAL to cats — permethrin toxicity is the #1 cause of feline pesticide poisoning. Cats exposed to permethrin via shared grooming, shared bathing areas, or accidental use develop tremors, seizures, and death without immediate veterinary treatment.","synthesis":{"derived_risk_level":"negligible","synthesis_confidence":0.82,"synthesis_method":"compound_composition","context_used":"human_adult","context_source":"product_users","exposure_modifier":0.759,"vulnerability_escalated":false,"escalation_reason":null,"compounds_resolved":2,"compounds_total":2,"synthesis_date":"2026-03-27","synthesis_version":"1.0.0"},"hazard_summary":{"sensitive_populations":"CATS (permethrin is lethal — #1 feline pesticide poisoning)","overall_risk":"high","primary_concerns":["Permethrin in dog flea shampoo is lethal to cats at any concentration","Secondary cat exposure from grooming treated dogs or sharing bathing areas","Handler dermal absorption during application"],"exposure_routes":"Dermal (pet bathing); oral (pet grooming); handler: dermal contact"},"exposure":{"routes":["dermal","oral"],"contact_types":["skin_prolonged","oral_direct"],"users":["dog","cat","adult"],"duration":"minutes","frequency":"monthly","scenarios":["Cat exposure to permethrin dog flea shampoo (LETHAL)","Cat grooming dog treated with permethrin flea shampoo (secondary transfer)","Handler dermal exposure during pet bathing","Residual permethrin in bathtub or shower contacted by cat"],"notes":"Permethrin is safe for dogs but LETHAL to cats. Cats are 100x more sensitive to permethrin than dogs due to deficient glucuronidation metabolism. ASPCA Poison Control reports permethrin as the #1 feline toxicosis call. Even sharing a bed with a permethrin-treated dog can poison a cat."},"consumer_guidance":{"usage_warning":"NEVER use permethrin/pyrethroid dog flea shampoo on cats or in environments shared with cats. Read all labels carefully. If cat is exposed to permethrin, seek emergency veterinary care immediately (tremors within 1-4 hours).","safer_alternatives":["Cat-safe flea shampoo (pyrethrin-free, permethrin-free)","Oral flea prevention medication (eliminates topical pesticide exposure)","Flea comb + regular bathing with non-medicated shampoo"],"red_flags":[{"indicator":"Product not veterinarian-recommended or approved","meaning":"Unverified safety and efficacy for intended use.","action":"Consult veterinarian before use. Choose NASC or VOHC certified products."}],"green_flags":[{"indicator":"NASC quality seal or veterinary recommendation","meaning":"Third-party quality verification and professional endorsement.","verification":"Look for NASC seal, VOHC acceptance, or FDA CVM approval."}],"what_to_ask":[{"question":"Is this product safe for my specific pet species and breed?","why_it_matters":"Species-specific toxicity varies dramatically (e.g., permethrin lethal to cats, xylitol lethal to dogs).","good_answer":"Yes, tested and labeled for your specific species/breed.","bad_answer":"Generic or unspecified species safety."}],"alternatives":[{"name":"Cat-safe flea shampoo","notes":"pyrethrin-free, permethrin-free"},{"name":"Oral flea prevention medication","notes":"eliminates topical pesticide exposure"},{"name":"Flea comb + regular bathing with non-medicated shampoo","notes":"Safer option"}]},"regulatory":{"applicable_regulations":[{"jurisdiction":"USA","regulation":"EPA FIFRA (for pesticide products)","citation":null,"requirements":"Pesticide registration required for flea/tick products. Label directions legally binding.","compliance_status":null,"effective_date":null,"enforcing_agency":"EPA","penalties":null,"source_ref":null},{"jurisdiction":"USA","regulation":"FDA CVM (Center for Veterinary Medicine)","citation":"21 CFR 500-599","requirements":"Animal drugs, feeds, and supplements subject to FDA CVM oversight.","compliance_status":null,"effective_date":null,"enforcing_agency":"FDA CVM","penalties":null,"source_ref":null}],"certifications":[],"labeling":{"required_disclosures":[],"prop65_warning":{"required":null,"chemicals":[],"endpoint":null,"notes":null},"ghs_labeling":{"required":null,"signal_word":null,"pictograms":[],"hazard_statements":[],"notes":null},"hidden_ingredients":{"trade_secret_protected":null,"categories_hidden":[],"estimated_count":null,"known_concerns":null,"notes":null},"notes":null},"recalls":[],"regulatory_gap":null,"notes":null},"lifecycle":{"recyclable":true,"disposal_guidance":"Triple-rinse container. Regular waste.","hazardous_waste":false,"expected_lifespan":"1_year"},"formulation":{"form":"varies","key_ingredients":[{"hq_id":"hq-c-org-000024","name":"Permethrin","role":"active_ingredient","concentration_pct":"0.5-1"},{"hq_id":"hq-c-org-000361","name":"Cypermethrin","role":"active_ingredient","concentration_pct":"0.1-0.5"}],"certifications":[]},"materials":{"common":[{"material_id":null,"material_name":"Primary formulation for pet flea shampoo (pyrethrin/pyrethroid-based)","component":"main product","prevalence":"common","notes":"Standard materials for pet care products."}],"concerning":[],"preferred":[]},"compound_composition":[{"hq_id":"hq-c-org-000024","compound_name":null,"role":"active_ingredient","typical_concentration":"0.5-1%"},{"hq_id":"hq-c-org-000361","compound_name":null,"role":"active_ingredient","typical_concentration":"0.1-0.5%"}],"identifiers":{"common_names":["pet flea shampoo (pyrethrin/pyrethroid-based)"],"aliases":[],"manufacturer":null,"brands":[]},"brand_examples":[{"brand":"Cutter Backyard","manufacturer":"Spectrum Brands","market_position":"mass_market","notable":"Yard mosquito spray"},{"brand":"OFF! Deep Woods","manufacturer":"SC Johnson","market_position":"mass_market","notable":"Mass-market insect repellent"},{"brand":"Thermacell","manufacturer":"Thermacell","market_position":"premium","notable":"Zone mosquito repellent device"}],"sources":[{"type":"expert_curation","name":"ALETHEIA Safety Database","date":"2026-03-25"},{"type":"regulation","title":"EPA FIFRA (for pesticide products)","jurisdiction":"USA","id":"src_fa9eaec6"},{"type":"regulation","title":"FDA CVM (Center for Veterinary Medicine) (21 CFR 500-599)","jurisdiction":"USA","citation":"21 CFR 500-599","id":"src_1f46a430"},{"id":"epa_permethrin_2006","type":"regulatory","title":"EPA: Permethrin Reregistration Eligibility Decision (RED)","year":2006,"inherited_from_compound":"hq-c-org-000024"},{"id":"aspca_permethrin","type":"report","title":"ASPCA Animal Poison Control Center: Permethrin Toxicity in Cats","year":2021,"inherited_from_compound":"hq-c-org-000024"},{"id":"epa_pyrethroid_reregistration_2011","type":"regulatory","title":"US EPA Pyrethroid Reregistration Eligibility Decision — cypermethrin/deltamethrin/lambda-cyhalothrin/bifenthrin/cyfluthrin/fenvalerate/tau-fluvalinate/fenpropathrin; type I/II classification; aquatic toxicity; cat sensitivity; sodium channel mechanism; human paresthesia; buffer zones (2011)","year":2011,"inherited_from_compound":"hq-c-org-000361"},{"id":"aspca_apcc_pyrethroid_2023","type":"veterinary","title":"ASPCA Animal Poison Control Center: Pyrethroid Toxicosis in Cats and Dogs — type I vs type II CS/T syndromes; extreme cat sensitivity (sodium channel/UGT deficiency); bathing decontamination; methocarbamol tremor control; cyproheptadine; lipid emulsion severe cases (2023)","year":2023,"inherited_from_compound":"hq-c-org-000361"}],"meta":{"schema_version":"4.0.0","last_updated":"2026-03-25","timestamp":"2026-05-02T18:26:34.211Z"}}