Kenton H. Arnold, DVM

Dr. Arnold holds degrees from Southwest Texas State University and Texas A&M University as well as a doctorate of Veterinary Medicine from Texas A&M University. An active member of the American Association of Equine Practitioners, he writes for equestrian publications on issues related to the health and well-being of performance and breeding horses. Dr. Arnold has served as a regular columnist for multiple equine publications and was a Founding Board Member for the Texas Horse Park.

Dr. Arnold is an avid cutting horse enthusiast, competing on a regular basis in NCHA, and AQHA competitions. He has been a top ten finisher multiple times in both cutting and pole bending competition at the prestigious AQHA World Show.

Prior to establishing his own private practice, Dr. Arnold was an associate veterinarian with Equiplex Veterinary Hospital in Flower Mound, where he worked with Dr. Bobby Willard.

Dr. Arnold is a founding associate of Animal Imaging, an outpatient imaging facility which provides state-of-the-art diagnostic imaging services to veterinarians, located in Irving. Dr. Arnold currently serves on the membership committee of the Texas Equine Veterinary Association, where he is also involved with the organization's Equitarian Outreach Project in Guatemala.

Margaret Rumbaugh, DVM

Katie Traugott, DVM

Jennifer Wickline, DVM

Dr. Jennifer Wickline joined Equine Veterinary Services as an Associate Veterinarian in 2012 after completing an internship with Reata Equine Hospital in Weatherford, Texas. She left EVS in 2014 and returned to Weatherford to work with Dr. Leea Arnold at The Arnold Reproduction Center. Dr. Wickline returned to EVS in 2016. Today she works part-time as a Senior Associate Veterinarian at EVS.

Dr. Wickline has a life-time of equine experience as an owner and competitor. She is a Magna Cum Laude graduate of Texas A&M University in Biomedical Science. She graduated in 2011 with honors from Texas A&M School of Veterinary Medicine. Dr. Wickline first became interested in Veterinary Medicine during a co-op class her senior year in high school with Dr. Arnold at Equine Veterinary Services. It was during this time that her interest in breeding and equine medicine first became evident.

Today Dr. Wickline utilizes her vast knowledge of horses to practice high-quality equine medicine with a special fair toward breeding, lameness and performance horse medicine. Dr. Wickline, her husband Steven Collins and their son Noah enjoy traveling the world together.

Carroll Brown Arnold
Practice Manager

Carroll Brown Arnold has been involved with EVS since its inception and is married to clinic founder Dr. Kenton H. Arnold. A graduate of Southern Methodist University, Carroll has also completed graduate work at the University of North Texas. She has extensive experience managing and developing multiple businesses and organizations in both the equine industry and the non-profit world. Carroll manages the clinics financial well-being and operations for each department as well as hiring, staff development, Team-building and all moving parts of the equine clinic that do not breath. An award-winning writer, she has been published in multiple travel and equine publications, and is the former publisher of America's Cutter and Americas's Barrel Racer magazines. Carroll received her first horse as a 16th birthday gift from her parents and went on to fill the next forty years competing in barrel racing, pole bending and cutting horse competitions with her family.

Regina Calverley
EVS Front Office Coordinator

EVS Front Office Coordinator Regina Calverley oversees the daily functions of the clinic office. Regina joined the clinic in June of 2021 as an Administrative Specialist and was quickly promoted to Team Leader and then Front Office Coordinator. She is the lead trouble shooter with accounts receivables and administrative procedures here at EVS. Her organizational and mentorship skills make her a major asset to the EVS Team. Regina's extensive customer service experience from the printing and estate sales industries are evident in her work. Her equine experience is limited to being a fan of rodeo and watching her grandchildren compete in equestrian events - yet she loves the friendly folks in the industry.

Austria Arnold Gerhardy
Sr. Communications Coordinator

A life-long competitor, Austria Arnold Gerhardy, Esq. is the EVS Sr. Communications Coordinator. Austria is a graduate of The Hockaday School, a 2019 magna cum laude graduate of Baylor University, and a 2023 graduate of the Vanderbilt Law School. Austria was admitted into the Texas State Bar in 2023. She has won multiple titles in the cutting pen including the 2014 National Youth Cutting Horse Association World Championship, 2020 NCHA Summer Spectacular Amateur Championship and was the 2021 NCHA Classic/Challenge Amateur Champion. In 2020, Austria and her gelding Cat About Houston won the NCHA Amateur Horse of the Year title. In 2016 Austria was named to Team USA for the AQHA Youth World Cup in Tamworth, Australia - where she won both competitions and was crowned the 2016 Youth World Cup Cutting Champion. Over the years Austria has been honored with multiple AQHA awards - including youth high point cutter in 2011, 2012, 2013, 2015, and 2017. She has been an aged-event finalist more than 45-times on numerous cutting horses. Today Austria continues her cutting horse obsession while working at EVS and the prestigious Haynes and Boone law firm in Dallas. Austria is married to Louis Gerhardy IV.

Lauren Rogers
Sr. Clinical Operations Assistant

EVS Sr. Clinical Operations Assistant Lauren Rogers knows her way around the clinic. Lauren joined EVS in 2022 as a Ranch Assistant where her attention to detail become obvious quickly. She was promoted to her current position in 2023. Lauren is a graduate of Terrell High School where she was president of FFA. Most recently she was awarded the American Degree from the National FFA Organization. Lauren is currently a junior at Texas A&M University - Commerce where she rides with the Stock Horse Team. She is passionate about agriculture and equine rehabilitation - and continues to develop her skills in all areas of veterinary management here at EVS.

Yeymi Haro
Head Vet Assistant

Head Vet Assistant Yeymi Haro is a natural with horses. She uses her leadership and practical skills along with her great communication style while working with patients, staff, and clients daily here at EVS. Yeymi loves to spend time with her family which oftentimes includes riding horses, traveling and involvement in church activities. Yeymi is a graduate of Terrell High School and currently attends Trinity Valley Community College. She joined the EVS Team as a Ranch Assistant in 2022 and has been promoted multiple times over the years.

Cashlin Dwyer
Vet Assistant

Cashlin Dwyer is a senior at OSU studying pre-veterinary medicine with a minor in business. She is originally from Florida but claims Texas as home now. Cashlin has extensive experience with bovine reproduction. She completed a Level I Internship here at EVS and joined the EVS Team as a Seasonal Vet Assistant later that summer. Cashlin has plans to attend vet school upon graduation from OSU. She spends her free time with her family and enjoys being outdoors with her camera whenever possible.

Isabel Gregory
Sr. Vet Tech

Isabel Gregory, a Dallas native and graduate of Southern Methodist University, completed both the EVS Level I and Level II Internships prior to being hired as a Vet Assistant in 2020. A natural with horses, Isabel was promoted to Vet Tech in 2021, and Sr. Vet Tech in 2022. Isabel served as the clinic's Head Vet Tech for more than a year before leaving to attend the prestigious University College of Dublin Veterinary School in Ireland. She is currently in her third year of vet school. Isabel works seasonally at EVS on holidays and school breaks. She is a true horsewoman with a strong equine background as both a competitor and owner. Isabel is married to Corey Gendron.

Cheyenne Kinder
Sr. Vet Assistant

EVS Sr. Vet Assistant Cheyenne Kinder graduated from Tarleton State University in 2025 with an Animal Science undergraduate degree. She was a former EVS Intern and originally joined the clinic in the Feed & Facility Department in 2023. The Kaufman, Texas cowgirl works full-time as a Sr. Vet Assistant supporting the EVS DVMs. She has a deep passion for horses and their medical needs. Cheyenne loves barrel racing, country dancing and tubing at the lake when time allows.

Tori Mallory
Vet Assistant

Tori Mallory joined EVS back in 2019 as a Ranch Assistant. Today she works as a part-time Vet Assistant here at the clinic. When not working at EVS this busy lady works for CareFlite as a Paramedic in their ground division. Tori has solid equine experience and loves working with horses and their owners. She is a multi-dog mom and loves to share stories of their dog diving and show adventures.

Emma Moir
Vet Assistant

EVS Vet Assistant Emma Moir is originally from Wills Point, Texas. She is a senior at East Texas A&M Commerce majoring in Animal Science with a pre-veterinary concentration. Emma completed an EVS Level I Internship in 2023 and returned to complete the EVS Level II Internship in 2024. She has plans to attend vet school in the near future. Most proud of her family, Emma finds her peace in her faith in God and believes He has great plans for her life.

Landry Nelon
Vet Assistant

Landry Nelon is a graduate of The Hockaday School in Dallas. Currently she is in her senior year at the University of Missouri - Columbia where she is in the Pre&45;Veterinary Scholars Program. Landry's future plans include Vet School. She is a natural with horses and loves working in the equine industry. When not working or studying this smart lady enjoys traveling the world.

Kyleigh Smith
Vet Assistant

EVS Vet Assistant Kyleigh Smith is a 2022 graduate of Mabank High School. She holds a 2025 Bachelor degree in Animal Science from Tarleton State University with a concentration in pre-veterinary medicine. Kyleigh enjoys working in a medical setting with equine owners and their horses. She plans to continue her education at Vet School in the future. Kyleigh loves hunting, fishing, running barrels and working out when time allows. She is engaged to Kaleb Stephenson.

Halyna Ziegler
Vet Assistant

EVS Vet Assistant Halyna Ziegler currently attends Dallas College in the Vet Tech Program. She finds this academic program to be a great way to combine her passion for animals and her interest in science. Halyna started riding horses at four when her great uncle introduced her to them in Germany. Today she is a competitive rider showing English jumpers and playing her guitar every chance she gets.

Jim Arnold
Sr. Feed & Facility Coordinator

Jim Arnold has been a major contributor to EVS since 1992. Today he works as the Sr. Feed & Facility Coordinator of the Terrell clinic where he oversees feed and hay purchasing as well as facility and equine maintenance. Jim holds both a bachelor and masters degree from Sul Ross University. He is a respected equine photographer specializing in cutting horse action, stallions and auction photography. Jim is webmaster for Equine Veterinary Services. Jim and his wife Teri live in Rowlett, Texas

Samuel Espinoza
Facility Coordinator

Samuel Espinoza knows horses well after a lifetime of caring for them. He is a retired Staff Sergeant in the US Army. Samuel is an excellent problem solver and has extensive experience with preventative maintenance and repairing any and everything. Samuel has many talents, yet he is most proud of his wife Kimberly and their two children.

Piper Alexander
Sr. Ranch Assistant-Team Leader

Quinlan Cowgirl Piper Alexander is the EVS Sr. Ranch Assistant - Team Leader. Piper is a graduate of Ford High School and currently attends Texas A&M Commerce where she is on the Rodeo Team. She grew up with horses and started off in the English world of jumping and dressage. Today Piper spends her horseback time running barrels. She joined the EVS Team in 2023 and was promoted to Team Leader in 2024.

Kira Anthony
Ranch Assistant

Royce City Cowgirl Kira Anthony joined EVS as a Ranch Assistant early in 2025. Kira is a Senior at iUniversity Prep and a long-time EVS client with her barrel horses. Kira enjoys her EVS work and views it as a great way to learn more about horses and how to help them perform and feel their best in a competitive environment.

Marlene Castillo
Ranch Assistant

Marlene Castillo joined EVS in June of 2025 as a Ranch Assistant. She calls Dallas home yet spends time in Stephenville, Texas at Tarleton State University where she is a Presidential Scholar. Marlene is pursuing a Bachelors of Animal Science with a concentration in animal reproduction. Her interest in equine reproduction originated in her interest in genetics and how it determines the potential for competitive success. Marlene plans to dedicate her career post-graduation to equine reproduction.

Holley Powell
Ranch Assistant

Holley Powell joined EVS is the summer of 2025 as a Ranch Assistant. She is a junior at Rockwall-Heath High School and loves to rodeo every chance she gets. Holley is involved with FFA, High School rodeo and a variety of academic and pre-veterinary organizations. She is soft-spoken and loves working around horses. Holley hopes to become a veterinarian in the future.