Are essential oils safe around pets?

Mostly no, especially for cats. This is one of the most dangerous things people unknowingly bring into pet households.

Cats are particularly vulnerable because they lack a liver enzyme (glucuronyl transferase) that helps break down phenols. Even passive exposure — diffusing in the same room — can cause respiratory irritation and liver damage over time.

Always avoid (highly toxic to cats and many dogs):
- Tea tree (melaleuca) — even 0.1–1.0 ml ingested can cause poisoning
- Pennyroyal
- Wintergreen
- Pine, fir, eucalyptus, citrus oils
- Cinnamon, clove, peppermint, ylang-ylang

Conditionally safer in low concentrations (still consult vet):
- Lavender (highly diluted)
- Frankincense

Symptoms of essential oil poisoning: drooling, vomiting, lethargy, tremors, difficulty walking, low body temperature, redness of skin or gums.

What to do if exposure is suspected:
1. Get the pet to fresh air immediately
2. Don't induce vomiting (some oils cause more damage on the way back up)
3. Call your vet or a poison line (ASPCA: 888-426-4435 in US, ~$80 fee)
4. Bring the bottle and any product info if you go to the vet

Safer alternatives for keeping a home smelling fresh: opening windows, baking soda, simmering pet-safe spices (cinnamon stick simmered briefly in water is OK — no oil), reed diffusers in pet-free rooms only.

Veterinary aromatherapy exists (very dilute, vet-supervised) — that's not what you'll find at a wellness store.