According to Wismer, any essential oil could be harmful to pets, depending on how much they’re exposed to and how. But the especially toxic oils, where pets are concerned, include wintergreen, d-limonene (citrus), pine, cinnamon, pennyroyal, eucalyptus and tea tree.Click to see full answer. Moreover, can you use eucalyptus oil around dogs?Many essential oils, such as eucalyptus oil, tea tree oil, cinnamon, citrus, pennyroyal, peppermint, pine, sweet birch, wintergreen, and ylang ylang are toxic to pets. These are toxic whether they are applied to the skin OR used in diffusers.Subsequently, question is, what essential oils are toxic to dogs? Some essential oils are poisonous to dogs. 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. One may also ask, can you use eucalyptus oil on dogs for fleas? 5. Make a natural flea repellent by adding six or seven drops of the essential oils of rosemary, peppermint, eucalyptus, tea tree, and citronella to a cup of water and shaking well. Use a spray bottle to apply the solution to your dog’s coat every other day.What essential oils are good for dogs? This list is not exhaustive: Anise Essential Oil. Basil Essential Oil. Birch Essential Oil. Calendula Essential Oil. Cassia Essential Oil. Cinnamon Essential Oil. Citronella Essential Oil. Clove Essential Oil.