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John Hayes was from in Maryland and graduated from the University of Georgia College of Veterinary Medicine in 1963. He then spent two years in the U.S. Air Force Veterinary Corps. He began private practice and opened the Squire Veterinary Clinic in Upper Marlboro, Maryland in 1966. He sold that practice in the mid 1980's. He moved to Ruckersville and opened the Ruckersville Veterinary Clinic in . He retired in 2006. 
- Web. “A heart as big as the moon” Remembering veterinarian Dr. John Hayes, Terry Beigie, Daily Progress, Lee Enterprises, June 11, 2020, retrieved December 2, 2020.
- Web. After retirement, Dr. Hayes not done helping his furry friends, Sharon C. Fitzgerald, Daily Progress, Charlottesville, Virginia, December 26, 2009, retrieved December 2, 2020.