NENN Mobile Veterinary Service was founded in 2020 by Dr. Katie Nenneker and her husband Greg Marx with a mission to revolutionize the veterinary industry through innovation - enhancing the care and well-being of animals while ensuring long-term economic sustainability for dedicated veterinary professionals. As a fully mobile practice, we eliminate the stress of transport by delivering expert, compassionate care directly to your barn, farm, or home.
Dr. Katie Nenneker leads our team with a special focus on equine medicine, offering advanced care in wellness, dentistry, lameness evaluations, and regenerative therapies. Nenn has grown into a full-service mobile veterinary team that cares for more than just horses - we serve a wide variety of animals, including cattle, goats, sheep, pigs, chickens, alpacas, and companion animals like dogs and cats.
We own our results with integrity, precision and pride.
Excellence is a way of operating, not a one-time act.
We don’t just provide care—we elevate lives.
Clarity, honesty, and openness define how we lead.
We set the standard and raise it.
We bring heart to everything we do.
Dr. Katie Nenneker, ‘Dr. Nenn’, obtained her Bachelor of Science degree in ‘Animal Science’ from California State University, Fresno, where she received the most prestigious NCEA award for equine medicine. As a highly respected athlete and valued member of the NCAA Equestrian team, her achievements include being the first female to win Fresno’s ‘Bulldog of the Year’. Her educational journey continued at Ontario Veterinary College in Canada, where she graduated as a ‘Doctor of Veterinary Medicine’ in 2015. Dr. Nenn specializes in sport horse and holistic equine health, focusing on providing a comprehensive and individualized approach to ensure the well-being of horses in training and competition. From injury prevention and rehabilitation to dental health, nutrition and fitness, she strives to maintain continuity of care and support to achieve the best potential and quality of life for every horse she treats. A wonderful mother and fine role model to her two young daughters, she also enjoys spending time with her family, animals and friends in her free time.
Greg's career in the Emergency Services is truly impressive. He has been a paramedic for nearly 30 years, working in multiple counties and departments in Southern California. In 2017, he became a member of the Los Angeles City Fire Department, where he works as a Firefighter Paramedic. He and his wife, Dr. Nenn, opened Nenn Equine in 2020, where he serves as the CEO. Greg enjoys competitive CrossFit, trips to Lake Havasu and spending time with his family.
Dr. Andrew Muir earned his Doctor of Veterinary Medicine (DVM) and his Master of Science, from Ohio State University. Before joining Nenn Equine, Dr. Muir served as the head surgeon and clinical professor of Farm Animal Medicine & Surgery at Louisiana State University School of Veterinary Medicine. His professional interests include farm animal surgery, musculoskeletal disease in ruminants, curriculum design, and developing novel treatment strategies for farm animals in the field. In his spare time, Dr Muir enjoys hiking, and adventuring with his wife, Stephanie.
Dr. Tanya Marotta graduated from UC Davis with a Bachelor of Science in Animal Science, with an emphasis on Equine Science, then continued at UC Davis to complete her Veterinary Schooling. While there, she cared for a heard of 180 teaching and research horses, managing cases ranging from lacerations to colic surgeries, and assisting in foaling duties. Dr. Marotta specializes in small ruminant and cattle while also providing services to equines and small animals. Her special interests include emergency medicine, wound management and small ruminant reproduction. In her free time, she enjoys time outdoors, hiking with her dogs, backpacking and riding her horse, Quinn.
Michelle has been working in veterinary medicine for over 10 years, acquiring significant experience in both small and large animal clinics. At Nenn Equine, she serves as a skilled Veterinary Assistant and Social Media Manager. Her hobbies include leather working, photography, horseback riding, home improvement projects and spending time with her husband and their two boys.
Claudia Ragsdale comes to the Nenn team with years of experience in the corporate world where she focused on effectively managing client relationships and delivery teams, developing efficient business operations and marketing practices, and guiding clients to deliver consistent and exceptional customer experiences. As Nenn's Business Manager she is focused on ensuring the team is operating like a well-oiled machine to provide the highest quality of care and service for Nenn's clients and their animals. Claudia’s hobbies have included three-day eventing and competing in CrossFit, including a 2024 CrossFit Games appearance.
Camille completed her Veterinary Assistant training at Charter College, building a solid foundation in animal care. Passionate about supporting animal health and well-being, she brings both compassion and practical skills to her role at NENN. Outside of work, she enjoys nature walks with her dog Toretto, expressing creativity through painting and drawing, and spending quality time with her family.
Emily earned degrees in Neuroscience and Psychology from the University of Minnesota. After graduation, she moved to California to serve as Assistant Program Director for Eco and Equine Therapy at an adolescent rehab center, where her passion shifted from human to animal care. She plans to attend veterinary school in fall 2026. At Nenn, Emily is our Lead Veterinary and Surgical Technician, focused on providing exceptional care and client service. Outside of work, she enjoys hiking with her dog Bentley, horseback riding, tennis, and traveling.
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