Lemon is one of the most popular essential oils because of its versatility and pleasant, uplifting citrus scent. In dogs, lemon essential oil is used to help ease fungal skin and ear infections. Use for: skin and ear infections Preliminary research suggests that these potent oils may have some health benefits for dogs and humans, and many holistic veterinarians incorporate essential oils into their practices. Many pet owners today are turning to essential oils for a variety of health concerns in their pets, including flea and tick prevention, skin issues, and behavior problems like anxiety.