Our Doctors

Osage Animal Hospital

1500 West Osage
Duncan, OK 73533

(580)255-4200

www.duncanvet.com

Our Doctors

Tristan J. Graf, DVM

Dr. Tristan grew up in Marlow, Oklahoma.  He graduated from Marlow High School in 1997 and attended Tabor College in Hillsboro, Kansas, majoring in Animal Science.  He transferred to the College of Agriculture at Oklahoma State University and was later accepted into the College of Veterinary Medicine.  He graduated with his Doctor of Veterinary Medicine Degree in 2004.

Following graduation, he and Dr. Kathy moved to Boise, Idaho.  Dr. Tristan worked at a small animal practice in Emmett, Idaho.  He quickly found his passion for small animal surgery and performed many surgical procedures, both routine and complex.  While living in the Northwest, he was able to do what he loves so much, spending time in the outdoors, hunting and hiking. 

Dr. Tristan and Dr. Kathy moved to Iowa in 2006.  He worked at the Eastern Iowa Veterinary Specialty Center as an emergency veterinarian, where he treated a wide variety of animals with serious conditions and was able to put his strong surgical skills to use.  He later accepted a position as an Associate Veterinarian at Tender Care Animal Hospital in Coralville.  It was there that he developed a strong interest in small animal dentistry.  He was mentored by a board-certified veterinary dentist and became very proficient in advanced dental procedures. 

Dr. Tristan and Dr. Kathy moved back to Oklahoma in the summer of 2011.  They purchased the existing Tidwell Animal Hospital in Duncan and it became Osage Animal Hospital.  They have devoted themselves to providing the best possible, most advanced care for pets in Southern Oklahoma.  They have a warm, family-oriented approach to veterinary medicine.  Dr. Tristan performs the majority of the dental and surgical procedures at Osage Animal Hospital, but enjoys seeing day-to-day cases and wellness visits, too.

Dr. Tristan tends to be in constant motion, with a wide variety of interests and hobbies.  Some of those include hunting and fishing, woodworking, improving the environment for native species such as Turkey and Quail, taxidermy, long-range shooting, running marathons and even beekeeping.  We can’t forget his lifelong support of his beloved Oklahoma State Cowboys.  GO POKES!

Kathy Graf, DVM, DACVIM

Dr. Kathy grew up in Kelley, Iowa.  She spent most of her early years surrounded by animals and went on to get her Bachelor’s degree in Animal Science from Iowa State University in 1997.  She was accepted into the Iowa State University College of Veterinary Medicine and received her Doctor of Veterinary Medicine degree in 2000.  Following graduation, she started her Internship in Small Animal Medicine and Surgery at Alameda East Veterinary Hospital in Denver, Colorado.  While there, she saw an incredible variety of cases and developed her interest in Internal Medicine. 

Dr. Kathy was selected for a Small Animal Internal Medicine Residency position at Oklahoma State University and moved to Stillwater in 2001.  While in Oklahoma, she quickly learned to love OSU and the Cowboys and also met her husband, Dr. Tristan!  Her Residency was completed in 2004 and she became a Diplomate of the American College of Veterinary Internal Medicine.

Dr. Kathy and Dr. Tristan moved to Boise, Idaho, where she began working as the Internal Medicine Specialist at Westvet, an emergency and specialty center.  She enjoyed treating a wide variety of complex cases, working as the only Small Animal Internist in Idaho.  While there, she also became very interested in ultrasound and took part in advanced training to become very proficient at ultrasound of the abdomen in both dogs and cats.  She enjoyed her time living in the Northwest, where she was able to hike and camp in some of the most beautiful areas of the country.

Dr. Kathy accepted a position at the Eastern Iowa Veterinary Specialty Center in Cedar Rapids, Iowa, in 2006.  She worked as the Internal Medicine Specialist for the hospital and continued to treat complex cases involving both dogs and cats.  She developed a devoted clientele and became known for her ability to manage difficult cases, as well as her compassionate care.

Drs. Tristan and Kathy moved back to Oklahoma in the summer of 2011.  They purchased the existing Tidwell Animal Hospital in Duncan and it became Osage Animal Hospital.  They have devoted themselves to providing the best possible, most advanced care for pets in Southern Oklahoma.  They have a warm, family-oriented approach to veterinary medicine.  Dr. Kathy enjoys spending the majority of her time seeing patients, ranging from routine wellness exams to chronic, serious illnesses.  She also performs ultrasounds and treats patients with chemotherapy, when necessary. 

When she is not working, she loves being outdoors and has a passion for exercise, particularly running.  Dr. Kathy has completed numerous marathons and has plans to participate in many more.  She also enjoys working out at the gym, gardening, travel, hiking and beekeeping.  She has two beloved “fur-babies”, her two cats named Grizwald and Jax.

Will Bernhardt, DVM

Dr. Will is originally from Marlow, Oklahoma. Dr. Will developed his interest in large animal medicine while growing upon his family's ranch, where they run a large commercial Angus cow/calf operation. He attended Oklahoma State University, where he earned a B.S. degree in Animal Science in 2011.  Following graduation, he was accepted into the OSU College of Veterinary Medicine. He received his DVM degree from OSU in 2015.  

Dr. Will is a busy veterinarian!  He performs surgeries for the Stephens County Humane Society, works at several different sale barns for both cattle and horses, and is now working at Osage Animal Hospital part-time.  His areas of interest for small animals include orthopedic surgery, anesthesia and pain management, and radiograph (x-ray) interpretation. When he is not working, he enjoys duck hunting, reading books and cheering on the Green Bay Packers!