Veterinarian Advisory Board

Dr. Jeanette Yamamoto

Dr. Jeanette Yamamoto obtained her bachelor’s degree in animal science from Oklahoma State University in 1997 and received her doctorate in veterinary medicine there in 2002. Returning to California after graduation, Jeanette completed a small-animal internship and worked as a senior emergency and critical care clinician at the Animal Specialty and Emergency Center in Los Angeles until 2012. In 2011, Jeanette established Peaceful Pets In-Home Euthanasia Services to ensure comfortable passings for dogs and cats in her area. She expanded her practice to incorporate hospice and palliative care, focusing her energy on her business full-time. Jeanette earned her veterinary hospice and palliative care certification in October 2020. 

She was introduced to doTERRA essential oils in December 2014, soon becoming a Wellness Advocate, and incorporating essential oils into her general practice and in-home euthanasia service. The essential oils have improved many of her patients’ quality of life and become an important part of her practice. 

Jeanette resides in the Santa Clarita Valley of Southern California. She and her husband, Jeremy, are parents to two wonderful children, Ellee and Justin. They have a cat (Boxsie), a pit bull mix (Bella), a Yorkie mix (Phoebe), and a miniature pinscher mix (Zero). 

Dr. Mia Frezzo

Dr. Mia Frezzo is a veterinarian, wife, and mother of three young children, residing in northern New Jersey. Her passion for veterinary medicine was initiated and fostered by her uncle—also a veterinarian. Mia studied and worked with her uncle since age 14. She graduated from Ohio State University’s College of Veterinary Medicine in 1998, returning home after graduation. 

She is the owner and medical director of the Animal Hospital of Hasbrouck Heights in Hasbrouck Heights, New Jersey. Dr. Frezzo’s patients, primarily dogs and cats, benefit greatly from her combined holistic and traditional approach, emphasizing doTERRA essential oils, natural health, and illness prevention.

Dr. Frezzo became convinced of the power of essential oils through her own personal experience. As her daughter struggled with a health issue, she grew increasingly frustrated with her lack of progress. Dr. Frezzo found doTERRA Breathe and On Guard to be highly beneficial and effective support for her daughter’s wellness.

Dr. Frezzo has proudly and confidently spoken in support of natural doTERRA essential oils and natural products with her family, friends, and clients, both in the United States and abroad. She has seen remarkable improvements in the physical and emotional well-being of her patients, leading to her writing SpOIL Your Pet: A Practical Guide to Using Essential Oils in Dogs and Cats.

Dr. Janet Roark

Dr. Janet Roark is a veterinarian and the proud owner of Hill Country Mobile Veterinary Service in Austin, Texas. She triple-majored for her BS at Ohio’s University of Findlay in biology, equestrian studies, and pre-veterinary medicine, along with minoring in chemistry. Afterward, she graduated from Michigan State University’s College of Veterinary Medicine in 2005.

Dr. Roark began using essential oils for her own health after battling both physical and emotional struggles related to stress. She then used essential oils in her veterinarian practice about six months after integrating them into her daily life. She now specializes in integrating acupuncture and essential oils along with traditional modalities.

Essential oils literally changed her life forever, and she has made it her mission to educate people all over the world regarding the safe and effective use of doTERRA essential oils with animal treatment.

Dr. Janis Fisher, DVM, CVA, CCRT, CAC

Dr. Janis Fisher is a graduate of the Atlantic Veterinary College of Prince Edward Island, Canada. Early in her career, she realized she wanted to take a more holistic approach to well-being. She became a certified veterinary acupuncturist through the International Veterinary Acupuncture Society in 2005. Ever since, her practice has included both acupuncture and traditional Chinese medicine herbal therapy.  

She’s a certified canine rehabilitation therapist and animal chiropractor.  

Her desire for natural solutions led her to doTERRA essential oils. After witnessing the health benefits of essential oils in her home, Janis integrated them into her veterinary rehabilitation practice. doTERRA essential oils are now diffused daily at her office, and she enjoys educating colleagues on the benefits of essential oils for their animal patients. 

Dr. Larry D. McCaskill, CVA, DVM, CTCVMP

Dr. McCaskill grew up in the rural community of Central, Louisiana, located on the outskirts of Baton Rouge. He attended Louisiana State University (LSU), completing his undergraduate. He was commissioned as a second lieutenant in the United States Air Force (USAF) in January 1970, becoming a fighter pilot and serving until August 1977, after which he entered the LSU School of Veterinary Medicine.

While in veterinary school, he joined the USAF Reserves, continuing his flying career on a part-time basis. Dr. McCaskill maintained dual careers as a practicing veterinarian and pilot for 29 years. He is a combat veteran of both Vietnam and the Gulf War. He graduated in May 1981 and opened the McCaskill Veterinary Hospital, a mixed animal practice, in New Roads, Louisiana, in August of that year.

His interest in and study of veterinary acupuncture and Traditional Chinese Veterinary Medicine (TCVM) began at the Chi Institute, located in Reddick, Florida. He became a CVA in March 2009 and is now a certified TCVM practitioner (CTCVMP), which requires certifications in veterinary acupuncture, Chinese veterinary herbal medicine, Chinese veterinary food therapy, and Chinese veterinary tui-na (massage techniques).

He has incorporated doTERRA essential oil therapies into his treatments for small animal patients. He loves promoting TCVM in worldwide presentations and mentoring students who are learning veterinary acupuncture. He is a Chi Institute instructor, teaching acupuncture to students in China.

Dr. McCaskill resides in Oscar, Louisiana, by False River with his wife, Lu, and their yellow Labrador, Cakki. They have two children, Matt and Megan, and five grandchildren. They are active members of St. Mary’s Catholic Church in New Roads. His favorite hobbies are exercising and dove and duck hunting with Cakki.