Question: is peppermint essential oil safe for animals?
Answer: Never leave essential oils or bottles in a place where your dog (or any other pets, or children) can get them. ... This includes oil of cinnamon, citrus, pennyroyal, peppermint, pine, sweet birch, tea tree (melaleuca), wintergreen, and ylang ylang. These oils are toxic whether ingested by mouth or spread on the skin.