Fitzgerald is a veterinarian at
Alameda East Veterinary Hospital, where the
Animal Planet television series
Emergency Vets and its follow-up
E-Vet Interns were filmed. For the past 25 years, he has been an assistant professor adjunct at the
University of Denver, where he teaches a course called "Perspectives in Veterinary Medicine". He also serves as a veterinary consultant for the
Aurora, Colorado police department's K-9 division. He has written chapters in medical texts on subjects such as emergency veterinarian medicine, toxicology, and reptile medicine and surgery. On August 11, 2007, Fitzgerald was a "Not My Job" guest on
NPR's "
Wait Wait ... Don't Tell Me". He told stories about
Keith Richards ("when Keith Richards suggests you're wasting your life, you gotta listen"), his fear of spiders and then correctly answered all three questions regarding
BALCO founder
Victor Conte. The segment has been replayed on several of Wait Wait ... Don't Tell Me's "best of" and compilation episodes; as of February 2017, this is the most-repeated guest segment of the show. After
Emergency Vets ceased production in 2002, Fitzgerald occasionally appeared in a set of pet health reminder PSAs on Animal Planet called "Animal Tips With Dr. Fitz". He also appeared in PSAs for the Animal Planet animal welfare project "ROAR" (Reach Out, Act, Respond). In 2007, Fitzgerald and the rest of the Alameda East team returned to prime-time television in a new Animal Planet series,
E-Vet Interns. On the new series, Fitzgerald continually stresses the importance of exposing young vets to experiences with exotic animals such as snakes and other reptiles, as well as showing young vets how to give back to their community by providing services for "working animals" such as police dogs. ==Stalking==