Indoor air quality affects companion animal health and welfare, with household chemicals, cleaning products, and smoking causing measurable harm to pets.
Companion animals are disproportionately exposed to indoor air pollution because they spend more time indoors than most owners, breathe at lower heights where heavy pollutants concentrate, and groom themselves, ingesting surface deposits. The welfare implications are real and documented: tobacco smoke causes oral and nasal cancers in cats, mesothelioma in dogs, and lung cancer in birds. Cleaning products that are safe for humans can be acutely toxic to cats and birds whose metabolism cannot detoxify certain compounds. Owners who are aware of these risks can protect their animals through ventilation, appropriate product selection, and smoke-free environments — interventions that benefit both animal and human health simultaneously.