Meet the Veterinarians of Risinger Veterinary Hospital in Terrell! We’re pleased to provide exceptional vet care for your pets!
Please call us at (972) 563-3305 to speak to one of our caring veterinary staff members!
Casey Risinger, DVM/Owner
Monday|Tuesday|Wednesday|Friday|Saturday
Dr. Casey M. Risinger has been around veterinary medicine his entire life. He grew up following his veterinarian father, Dr. M.L. Risinger, at his vet clinic in Kaufman and later in a mobile large animal practice in the Terrell area. Dr. Casey graduated from Terrell High School then attended Texas A&M University, graduating from Texas A&M College of Veterinary Medicine in 1986. After practicing in Vernon for 1 year, he moved back to Terrell and opened Risinger Veterinary Hospital in June 1987. He and his father practiced together until Dr. M.L. Risinger passed away in 2003. Dr. Casey is married to Phyllis and they have 6 children: Rebekah, Rachel, Mitt, Marty, Casey Dean and Court, and 5 grandchildren. The family attends church at First Baptist Church in Terrell. His hobbies include raising cattle and following his kids around.
Kerri McMahon, DVM
Wednesday|Thursday|Friday
Dr. McMahon attended Texas A&M University and graduated from veterinary school in 1999. She grew up and went to school in Royse City, but since graduating vet school has practiced in Arizona on the Navajo Reservation, in Colorado on the western slope of the Rockies, and in southern California. Her love for all things Texas brought her home in 2011. Dr. McMahon really enjoys time with any type of animal with a particular passion for illness and internal medicine in any species. Dr. McMahon loves being a vet and also loves her family time with Tim and their daughters, Hannah and Riley. The family lives on a small farm in Wills Point surrounded by an ever growing tribe of animals large & small. The whole family enjoys riding horses, reading books, camping, and a good bonfire. Cornerstone Church of Rockwall is the McMahon family’s church home.
Dr. McMahon invites you to come by and say hello, even chat a while. She feels blessed to be part of the Risinger Veterinary Hospital family.
Rebecca Erhart, DVM
Tuesday|Wednesday|Thursday|Friday|Saturday
Dr. Becca is a Texas native, growing up just outside of Dallas. She always dreamed of becoming a veterinarian and worked hard to make it happen. In high school she was involved with her local FFA chapter both as an officer and showing livestock. She attended Texas Tech University earning her Bachelors of Animal Science in 2020. Afterwards she moved to Arizona to attend vet school at Midwestern University, graduating in 2025. Dr. Becca lives with her fiancé, Cole, and the two of them are looking forward to adding some 4-legged critters to their family. Outside of work you can find her reading in her hammock, in the kitchen baking, or watching a hockey game. Dr. Becca is excited to meet Yall and help out all creatures great and small.
Hannah Dillon, DVM
Monday|Tuesday|Wednesday|Thursday
Dr. Hannah Dillon earned her Doctor of Veterinary Medicine degree from Texas A&M University and is dedicated to providing compassionate, high-quality care for her patients. She has a special interest in both soft tissue and orthopedic surgery and enjoys helping pets live healthier, happier lives through advanced medical and surgical care.
Dr. Dillon is passionate about building strong relationships with pet owners and believes that excellent veterinary medicine begins with trust, communication, and a genuine commitment to animal well-being. Her goal is to ensure every pet receives personalized care tailored to their individual needs.
Outside of the clinic, Dr. Dillon enjoys hiking, cooking, and spending time with her husband and pets.