Our Veterinarians

The Southside Pet Hospital team of skilled veterinarians welcomes you to our practice. Proudly serving the Olathe area. At Southside Pet Hospital, it is our daily privilege to provide quality vet care to your cherished pet, with compassion and competence. We hope to ensure a positive impact on our patients, pet owners and the local community.

David C. Gray, DVM


Dr. Gray, a graduate of Kansas State University School of Veterinary Medicine, has been a partner/owner of Southside Pet Hospital, Inc. since 1984. He is the Managing DVM here at Southside. Dr. Gray's trademark is providing personal attention to his many clients and patients, making great effort to keep clients informed of their pets' health status. He strives to offer quality veterinary medicine and diagnostics, incorporating current treatment and pharmaceutical trends in his practice. Dr. Gray is out of the office on Wednesdays.

Dr. Gray enjoys sports (especially KSU football), talk radio, and working on projects around the house. He and his wife, Kate, live in Olathe and have two grown daughters – Emily and Elizabeth.

Daniel Rueb, DVM


Dr. Rueb is the newest member of the Southside team! He is a K-State graduate who enjoys the challenges of internal medicine. He is also interested in animal behavior and expanding his surgical knowledge and skill. He was involved in the business management and behavior clubs while in veterinary school. He is out of the office on Tuesdays.

While not working, Dr. Rueb enjoys reading, hiking with his dog Happy, fishing, and spending time with family and friends.

Dr. Bob Thayer, DVM


Dr. Bob Thayer, DVM Dr. Thayer graduated from Kansas State University in 1985 with a B.S. in Animal Science. While working on his Masters in Reproductive physiology and managing Kansas State’s Sheep production herd, he decided to attend Vet School and graduated with his DVM degree in 1990.

Since then, his career in small animal medicine and surgery was established in emergency medicine, general practice, and practice management. Dr. Thayer married his wife and moved to Southern California to open his own practice in San Jacinto, CA.

His special interests are surgery and internal medicine. The celebration of the “human animal bond” is a daily ritual and Dr. “Bob” believes it is an integral part of our health and society. His hobbies and extra time are spent with wildlife conservation organizations, fishing, and archery.