Meet Our Team

The staff at Callahan Drive Animal Hospital is committed to maintaining a high level of customer care. In a world of automated messages and self check outs, we value face to face communication and a relaxed, friendly environment. Our staff is like a family here, and we want you to be part of our family.

Dr. James Hilla

Jamie spent his youth in Clifton, New Jersey and graduated from Montclair State University in 1989. After graduation, he applied to many veterinary colleges and chose the University of Tennessee in Knoxville. He  graduated from UTCVM with his doctorate in 1994. Doc's passion has always been cats and dogs although he has always had a special interest and has extensive knowledge in exotic animals. Dr. Hilla is also a herpetologist and has spent many years breeding and raising reptiles. He is approachable, easy to understand and takes great pride in client education. When he is not taking care of our fur babies, he enjoys golf, cooking and most outdoor activities.

Gwen Graning

Born and raised in Knoxville, she has worked for Veterinarians from the time she was 15 years old. Before graduating from Lincoln Memorial University, she worked for several local veterinarians learning all aspects of a veterinary hospital.One of her jobs included the U.T. College of Veterinary Medicine in the Department of Environmental Practice (exotic medicine). Formerly a licensed tech, now her focus as hospital manager is to treat team members and clients the way Dr. Hilla and her always wanted to be treated themselves. Therefore, her main objective is to develop a staff that creates a warm, friendly and compassionate atmosphere where the pet always comes first. On her off time, Gwen spends time at her farm with her goats, chickens and horses. She also plays golf, camps and trail rides with a little dressage thrown in.


Find us on the map

Office Hours

Our Regular Schedule


8:30 am-1:00 pm

2:00 pm-5:00 pm


8:30 am-1:00 pm

2:00 pm-5:00 pm


8:30 am-1:00 pm

2:00 pm-5:00 pm


8:30 am-1:00 pm

2:00 pm-5:00 pm


8:30 am-1:00 pm

2:00 pm-5:00 pm






Read What Our Clients Say

    I love Callahan Drive Animal Hospital! Best Veterinarian & Staff in Knoxville been going here for 15 years ! Only place I trust with my fur babies ! Everyone is helpful and friendly and they really care about your animals highly recommend !

    Tracy S.

    Took my 3 y/o tortoise recently and I was pleasantly surprised. Not only was the vet knowledgeable and kind, but the overall visit (including an x-ray) was reasonably priced. I definitely recommend and I will be returning for future services

    Valerie B.

    This group loves animals! Everyone is so kind and helpful! This Vet loves sharing information too! Wouldn’t go anywhere else!

    Karen W.

    This is the best vet I’ve ever took my dog to I couldn’t see myself going anywhere else they took very good care of my son and I feel so much better knowing exactly what’s wrong with him very very sweet staff thank you soooooooo much Dr.Hilla and staff

    Diane J.

    Doc Villa ALWAYS takes care of Studly Dudley!! I will ALWAYS recommend Callahan Drive Animal Hospital & their entire team as they truly do care for your animal in the same way you do!! Dr Villa has cared for Dudley for most of his SIXTEEN years & he’s still happy, healthy & strong!! I strongly believe, Stud has made it to this old age so gracefully due to the care he’s been given with this facility!! I would not trust another team than Callahan Animal with my “first child”, the only place for us to go!! Highly recommended!!

    Lauren H.

    10/10 experience was even better than hoped for. As a snake owner, you hear things about vets that make you question taking them and it was very comforting and nice to have someone who not only helped but took the time to talk about caring for them properly. Thank you guys so much!

    Lydia B