Dr. Wayne DeYoung attended the University of Illinois and received his Doctor of Veterinary Medicine in 1975. He worked as a clinical research Veterinarian in New Jersey  from 1975 - 1979 seeking FDA approval for veterinary pharmaceuticals.

From 1979 - 1998, he was a swine practitioner/hog farmer on the family farm.  In 1995, Dr. DeYoung pursued his interest in small animal medicine and opened Manteno Animal Hospital in October of 1997.

Dr. DeYoung and his wife, Penny, reside in Peotone, where they  provide occasional lodging for their 4 two-legged children, and provide continuous lodging for their 3 pugs (Luke, Leia, & Chewie), 3 cats (Jabba Bob, Sawyer Brown, & Mara Jade), and their resident turtle of 19 years (Pokey). Dr. DeYoung is welcomed to the animal hospital each morning by his cat Sam Adams, who patrols his office by day and the reception area by night.