Reed, ultrasonic and nebulizing diffusers have different exposure risks.
Know your diffuser
A reed diffuser has an open reservoir and scented reeds. Ultrasonic and nebulizing devices release oil droplets into the air. Pet Poison Helpline explains that these droplets can settle on fur and be swallowed during grooming.
Think beyond the shelf
A high shelf may still be accessible to a cat. Cords can be pulled and bottles tipped. Review both the device and the refill location. A secure room means an animal cannot enter it, reach the liquid or knock over the equipment.
Some households should skip diffusion
ASPCA recommends avoiding essential oil diffusers in homes with birds. Pets with breathing problems also need particular caution; ask their veterinarian whether to avoid a diffuser entirely.
Create an alternative routine
Before adding scent, clear out trash, wash washable bedding according to its care label and deal with the source of an odor. Keep the animal’s resting space free of added fragrance. Do not use a diffuser to cover a persistent odor that needs cleaning or investigation.
Sources and more help
Explore all Home Fragrance Safety resources.
General education from Ella & Iris Home; not medical or veterinary advice or a safety certification for any product. Guidance checked October 10, 2026.