{"hq_id":"hq-p-pet-000077","name":"Ethylene Glycol Antifreeze and Pet Poisoning (Sweet Taste Attractant, Kidney Failure, 1 Tablespoon Lethal to Cat, Bittering Agent Laws)","category":{"primary":"pet_care","secondary":"pet_poison","tags":["ethylene glycol","antifreeze","dog","cat","kidney failure","oxalate","sweet taste","bittering agent","denatonium"]},"product_tier":"PET","overall_risk_level":"high","description":"Ethylene glycol (EG), the primary ingredient in most automotive antifreeze products, is one of the most common causes of fatal poisoning in dogs and cats. Its sweet taste actively attracts animals, and the lethal dose is extremely small: approximately 1.4 mL/kg for cats (one tablespoon for an average cat) and 4.4 mL/kg for dogs. EG itself is not directly toxic — liver alcohol dehydrogenase metabolizes it to glycoaldehyde, glycolic acid, and finally oxalic acid, which combines with calcium to form calcium oxalate crystals that deposit in renal tubules, causing irreversible acute kidney failure within 24-72 hours. Treatment is effective only if initiated within 8-12 hours (cats) or 12-24 hours (dogs) using fomepizole (4-methylpyrazole) or ethanol to competitively inhibit alcohol dehydrogenase. After crystal deposition begins, the prognosis is grave. Several US states mandate the addition of denatonium benzoate (Bitrex) bittering agent to antifreeze to deter ingestion, though compliance varies.","synthesis":{"derived_risk_level":"high","synthesis_confidence":0.82,"synthesis_method":"compound_composition","context_used":"human_child","context_source":"product_users_fallback","exposure_modifier":1,"vulnerability_escalated":true,"escalation_reason":"Child exposure group","compounds_resolved":1,"compounds_total":1,"synthesis_date":"2026-03-27","synthesis_version":"1.0.0"},"hazard_summary":{"sensitive_populations":"cats (extremely low lethal dose — 1 tablespoon), small dogs, outdoor cats with access to garages and driveways, wildlife","overall_risk":"high","primary_concerns":["Sweet taste actively attracts animals to drink antifreeze","Cat lethal dose is just 1 tablespoon (1.4 mL/kg) — among the most toxic common household chemicals","Irreversible kidney failure once calcium oxalate crystals form (12-24 hours)","Treatment window is narrow: 8-12 hours for cats, 12-24 hours for dogs"],"exposure_routes":"Ingestion (sole route — licking antifreeze puddles, spills, or open containers)."},"exposure":{"routes":["ingestion"],"contact_types":["ingestion_direct"],"users":["pet_dog","pet_cat","child"],"duration":"acute","frequency":"accidental","scenarios":["Cat or dog licks antifreeze puddle in garage or driveway (sweet taste is attractive)","Radiator overflow or coolant leak creates accessible puddle","Pet drinks from container of drained coolant during vehicle maintenance","Spill from antifreeze bottle stored at ground level accessible to pets"],"notes":"Ethylene glycol metabolism: EG → glycoaldehyde → glycolic acid → glyoxylic acid → oxalic acid (via alcohol dehydrogenase, aldehyde dehydrogenase, lactate dehydrogenase). Calcium oxalate crystals deposit in renal tubules within 12-24 hours → irreversible acute kidney failure. Treatment window: cats 8-12 hours, dogs 12-24 hours. Antidote: fomepizole (4-MP, Antizol-Vet) preferred; ethanol (7 mL/kg 20% IV) as alternative. Denatonium benzoate bittering: mandated in 17 US states + DC; voluntary addition by major manufacturers. Propylene glycol antifreeze: non-toxic alternative ('pet-safe' formulations)."},"consumer_guidance":{"usage_warning":"Store antifreeze in sealed, pet-proof containers elevated off the ground. Clean up ALL spills immediately — even a small puddle can be lethal to a cat. Check vehicles regularly for coolant leaks. If you suspect antifreeze ingestion, rush to emergency veterinary care IMMEDIATELY — do not wait for symptoms. Every hour of delay reduces survival chances. Consider switching to propylene glycol-based antifreeze.","safer_alternatives":["Propylene glycol antifreeze (Sierra, Prestone LowTox) — non-toxic to pets","Bittered ethylene glycol products (check for denatonium benzoate additive)","Enclosed coolant systems that prevent puddle formation","Regular vehicle maintenance to prevent leaks"]},"regulatory":{"applicable_regulations":[{"jurisdiction":"USA","regulation":"State Antifreeze Bittering Agent Laws (17 States + DC)","citation":"Various state statutes; Antifreeze Bittering Agent Act proposals at federal level (not yet enacted)","requirements":"17 US states and DC mandate addition of denatonium benzoate bittering agent to consumer antifreeze. No federal mandate exists despite multiple proposed bills. Major manufacturers (Prestone, Peak) voluntarily add bittering agent nationwide. Oregon was the first state to mandate (2005). Bittering agent concentration: typically 30 ppm denatonium benzoate.","compliance_status":null,"effective_date":"2005-01-01","enforcing_agency":"State environmental/consumer protection agencies","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":"Take used antifreeze to automotive service centers or hazardous waste collection — NEVER pour down drains or onto ground. Ethylene glycol is toxic to aquatic life and can contaminate drinking water.","hazardous_waste":true,"expected_lifespan":"2-5 year coolant change intervals; dispose of drained fluid properly"},"formulation":{"form":"varies","key_ingredients":[],"certifications":[]},"materials":{"common":[],"concerning":[],"preferred":[]},"compound_composition":[{"hq_id":"hq-c-org-000026","compound_name":null,"role":"toxic_ingredient","typical_concentration":"cat lethal dose: 1.4 mL/kg (~1 tablespoon); dog: 4.4 mL/kg; metabolized to oxalic acid causing kidney failure"}],"identifiers":{"common_names":["ethylene glycol antifreeze and pet poisoning (sweet taste attractant, kidney failure, 1 tablespoon lethal to cat, bittering agent laws)"],"aliases":[],"manufacturer":null,"brands":[]},"brand_examples":[],"sources":[{"type":"expert_curation","name":"ALETHEIA Safety Database","date":"2026-03-26"}],"meta":{"schema_version":"4.0.0","last_updated":"2026-03-26","timestamp":"2026-05-02T18:29:24.141Z"}}