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About Us

Mission Statement
Our mission at Hayes Equine Veterinary Services is to provide quality medicine, veterinary care and service 24/7. Whether in the field or in the clinic, from conception through retirement, our goal is to provide personal care for your horse.

About Us
Started in 1985, by Dr. Katie Hayes as a mobile equine practice out of her house, Hayes Equine Veterinary Services has provided veterinary service 24/7 to the horses and horse owners of Texoma for 25 years. The original Texas clinic at 6544 FM 1753, Denison, TX is located on Dr. Hayes’ home property where Dr. Hayes provides 24 hour veterinary care. The clinic focuses on wellness programs, emergencies, medical: sick and hurt horses, intensive care, dentistry, reproductive services, and lameness.

Our staff is dedicated to provide quality service and veterinary care for you and your horse.


Dr. Hayes graduated from Texas A&M and has been practicing equine medicine for 30 years. She worked for Sherwood Animal Clinic in Beaumont, TX and for Dr. Dick Shepherd as a resident vet on his TB breeding farm in Aubrey, TX before starting her own equine practice in Denison in 1985.

An active member of Equine Veterinary Associations, Dr. Hayes has served on committees and boards of the Texas Veterinary Medical Association, Texas Equine Veterinary Association, and past president of the North Texas Equine Practitioners Association. Dr. Hayes is also a board member of the handicap riding association Hanna’s Horseshoes of Hope.

Dr. Hayes believes in giving back to the local horse community. She donates her time, money and services to local horse organizations, shows, rodeos, and horse rescue groups. She also actively participates in equine presentations for the local Extension Services, 4H, and Horse Clubs. Always encouraging and mentoring future horse vets, Dr. Hayes offers high school students with pre-vet interest an opportunity to shadow and veterinary students to do externships at her practice. Her interests are Repro, Foals, Dentistry, and Racehorses.

Dr. Meghan McCarville
Dr. McCarville received her DVM from Minnesota in May 2013. She did a 6 month internship at Equine Services Hospital in Simpsonville, Ky. She wanted to relocate to Texas because half of her family and her boyfriend’s family are in Texas. She has an interest in riding and showing western pleasure horses. She has traveled abroad spending a year in China teaching English and did an externship in Morocco. She has experience in Lameness, Dental, Reproduction, Surgery and Emergency medicine.


NAWANA MAHAN - Office Manager
Nawana oversees the daily functions of Hayes Equine in Texas and OK including client relations, billing, and management. She started with Hayes Equine in 2000 as a technician. She has years of experience with horses from Hayes Equine and from breeding and showing Paint Horses.

BETTY ANN SULLIVAN - Receptionist Hayes Equine Texas
Betty Ann was originally from California. She has an extensive back ground in the feed store industry. She started with Hayes Equine in 2007 as the receptionist. She has years of experience with horses and enjoys raising Appaloosa Horses.

DIANNE HILDEBRAND - Veterinary Assistant
Dianne has been with Hayes Equine since 1998 as a technician on the truck and as secretary in both offices. She is USDA/NVSL certified and performs the Coggins tests for our lab, Texoma Equine Lab.

Kate Jacobs - Veterinary Assistant
Kate joined Hayes EQuine in February 2014. She was a personal trainer at Nautilus for many years and still enjoys working out. She has ridden and owned horses most of her life and enjoys pleasure riding.

Katie Hayes DVM
Dr. Meghan McCarville

6544 FM 1753
Denison, TX 75021
Mon - Fri: 8-5, Sat: 8-12


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