Our Veterinarians


All our doctors are licensed and accredited to practice in Iowa and Illinois, as well as members of both the American Veterinary Medical Association and the Iowa Veterinary Medical Association.

Greg Garvin, DVM

Dr. Garvin is a 1978 graduate of the Iowa State University College of Veterinary Medicine. He practiced in Algona, IA for 5 years after graduation before accepting a position at the Walcott Veterinary Clinic in 1983, where he has stayed since. Dr. Garvin grew up raising hogs and cattle in the rural Muscatine area. In his free time he enjoys outdoor activities and spending time with family and friends.

Grant Allison, DVM

Dr. Allison is a 1984 graduate of the Iowa State University College of Veterinary Medicine and a 2009 graduate of the Executive Veterinary Program Certificate in Swine Health Management from the University of Illinois. After spending his first year in South Dakota, he has been in clinical practice in Walcott since 1985. In his spare time, Dr. Allison enjoys reading about pigs and running road races up to 13.2 miles. His favorite race is the Flying Pig Half Marathon.

Nathan Wedeking, DVM

Dr. Wedeking is a 2001 Iowa State University College of Veterinary Medicine graduate. He accepted an associate position here at the Walcott Veterinary Clinic that May, and has been providing service to both large and small animal clients ever since. Dr. Wedeking enjoys the variety provided by general practice, and the relationships developed with our diverse clientele. Dr. Wedeking enjoys time with his family passing on outdoor traditions.

Ryan Schaefer, DVM

Dr. Schaefer is a 2008 graduate of the Iowa State University College of Veterinary Medicine. He worked at a large and small animal clinic in NW Iowa for a year before coming back to Walcott in 2009. Dr. Schaefer is from the Blue Grass area where he grew up on a dairy farm. Rural Walcott is now his home with his wife, kids, cat Tater and dog Arlo. In the spring and fall Dr. Schaefer enjoys helping with fieldwork on the family farm.

Allison Knox, DVM

Dr. Knox is a 2019 graduate of the University of Illinois College of Veterinary Medicine. She joined the Walcott Veterinary Clinic as an associate veterinarian in June 2019 and enjoys the variety of mixed animal practice. Having spent most of her life in Champaign, Illinois, she now calls Blue Grass her home. In her spare time, Dr. Knox enjoys reading and caring for her adopted dog, Sam, and her guinea pig, Indy.