According to the ASCPCA, It is best not to give or apply highly concentrated oils to pets.If a pet has an underlying health problem, particularly a respiratory issue, it may be best to avoid use of essential oil diffusers in the household.Do not use essential oil diffuser in the house if there are birds present.If using a diffuser or warmer make sure they are out of reach of pets and that pets can leave the area if the smell is getting too strong for them.Don’t keep a diffuser in the same room (or use a strong concentration) for animals who groom themselves.