Dr. Jim Antuñano graduated from the College of Veterinary Medicine in 1980. He then specialized in Emergency Medicine and Critical Care, teaching Emergency Medicine at Cornell University College of Veterinary Medicine in New York State. He entered into private practice at the Animal Emergency Services and Trauma Center, which provides emergency service to seventy-three hospitals in Suffolk County, New York. Dr. Antuñano then moved on to Smithaven Animal Hospital, a medical and surgical referral hospital where he was able to apply his medical and surgical skills and where he averaged sixteen to eighteen hours of surgery per week.

In 1988, Dr. "A" (as he is affectionately referred to by both clients and staff) then founded the Animal Medical Center in Valrico, Florida. He has special interests in animal emergency medicine, laser surgery and internal medicine. Dr. Antuñano is a member of the Florida Veterinary Medical Association, Veterinary Emergency and Critical Care Society, Cornell Feline Health Center, Veterinary Laser Surgical Society, Humane Society of Tampa Bay and is a member of the American Animal Hospital Association. Dr. Antuñano regularly attends Veterinary Seminars to maximize the quality of care provided at the Animal Medical Center.