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Dr. Mark C. Walker, BVSc, DACVIM

Internal Medicine


Dr. Walker originates from Auckland, New Zealand. He graduated from Massey University in 1990 with a Bachelor of Veterinary Medicine. After working in a referral clinic in Liverpool, England, he was appointed the position of Junior Lecturer at Massey University. Dr. Walker completed a residency in small animal internal medicine at the University of Florida in 1999, the same year he became a Diplomate of the American College of Veterinary Internal Medicine.

Dr. Walker’s primary interests include patient diagnosis and management as well as actively contributing to veterinary continuing education. He has lectured in the advanced small animal medicine course at the University of Florida and he presents seminars, lectures and workshops to veterinarians locally and nationally. He received the Small Animal Chapter Prize in Small Animal Medicine from the Australian College of Veterinary Scientists. Dr. Walker is a member of the American Animal Hospital Association, Florida Veterinary Medical Association, Big Bend Veterinary Medical Association and the Comparative Gastroenterology Society.

Dr. Walker has a number of journal and proceedings publications. He has authored chapters in the second and third edition of The 5 Minute Veterinary Consult and third edition of Slatter’s Small Animal Surgery textbook. Dr. Walker’s medical interests include cardiology and gastroenterology. Dr. Walker is married to Dr. Olga Walker. They have 5 children and a Staffordshire Bull Terrier named Luna.


  • 1999-2012: Associate North Florida Veterinary Specialist
  • 2001-2004: Research Scientist, Gene Therapy for Anemia (cats) and Pompe’s Disease (human cardiomyopathy), Applied Genetic Technologies Corporation Inc.
  • 1996-1999: Resident, University of Florida
  • 1998: ACVIM Boarded (Small Animal Internal Medicine)
  • 1996: MACVSc (Internal Medicine)
  • 1994-1996: Junior Lecturer, Massey University, New Zealand
  • 1990-1994: Associate and Intern, Rutland House Veterinary Hospital, Liverpool, United Kingdom
  • 1990: MRCVS


Anesthesia and Critical Care


Dr. Shih is double-boarded in Veterinary Anesthesia and Analgesia and in Veterinary Emergency and Critical Care. He graduated from the University of Sao Paolo in Brazil with his doctorate degree in Veterinary Medicine in 1999. He completed his residency in Veterinary Anesthesia at the University of Florida. He then completed a fellowship in Veterinary Emergency Medicine and Critical Care. Dr.

Shih is boarded in both the American College of Veterinary Emergency Critical Care and also in the American College of Veterinary Anesthesia and Analgesia. Following his residency and fellowship, he spent 12 years on faculty as an associate professor in the Department of Anesthesia at the University of Florida College of Veterinary Medicine. He joined the staff at Capital Veterinary Specialists, Jacksonville in 2016 and is excited to be serving the First Coast. Dr. Shih's areas of interest include preload monitoring, hypovolemic shock, and cardiopulmonary resuscitation.

Dr. Shih is married and has two children. He enjoys fishing with his sons in his free time.


2013 - 2016: Associate Professor, Department of Anesthesia, University of Florida College of Veterinary Medicine
2007 - 2013: Assistant Professor, Department of Anesthesia, University of Florida CVM
2009 - 2016: Fellowship in Veterinary Emergency and Critical Care, University of Florida CVM
2007: Boarded by the American College of Veterinary Anesthesia and Analgesia
2004 - 2007: Veterinary Anesthesia Residency, University of Florida CVM
2003: Boarded by the American College of Veterinary Emergency and Critical Care
1994 - 1999: Doctor of Veterinary Medicine, University of Sao Paolo, Brazil, School of Veterinary Medicine

Dr. Steven Neihaus, DVM, DACVS



Dr. Neihaus is a Chicago area native and came to the surgery department of Capital Veterinary Specialists in May 2015. He attended the University of Florida in Gainesville for his undergraduate education. After graduating from the University of Illinois College of Veterinary Medicine, Dr. Neihaus spent a year as a general practitioner before going on to complete a rotating internship at the Animal Emergency and Referral Center (now Blue Pearl Veterinary Partners) in Northbrook, Illinois. During his residency at Affiliated Veterinary Specialists under Dr. Robert Goring, Dr. Neihaus published multiple research papers, presented at national veterinary conferences and was the recipient of the prestigious Clinical Research Award at the American College of Veterinary Surgeons Residents Forum.

Dr. Neihaus’ professional interests include minimally invasive surgery (arthroscopy and laparoscopy), oncologic surgery and soft tissue reconstruction, and complex orthopedic and fracture repair. As a dedicated member of his community, Dr. Neihaus also enjoys giving back. Dr. Neihaus donates his time and surgical skills to help special needs cases from various rescue organizations around the country. Dr. Neihaus is a member of the Veterinary Society of Surgical Oncologists, Veterinary Orthopedic Society, and local and national veterinary medical associations.

Dr. Neihaus and his wife, who is also a veterinarian, live in the Mandarin area with their two sons and Dalmation mix, Lucy. When not at work, Dr. Neihaus enjoys fishing, boating, playing and coaching ice hockey and cheering on his favorite sports teams – the Chicago Bears, Blackhawks and the Florida Gators.


  • 2011-2015: Associate Surgeon – Chicago Veterinary Emergency and Specialty Center
  • 2012: Board Certification – American College of Veterinary Surgeons
  • 2010: American College of Veterinary Surgeons Residents Forum Award for Clinical Research
  • 2008-2011: Surgical Residency w/ Dr. Robert Goring
  • 2006-2007: Rotating Internship – Animal Emergency and Referral Center, Northbrook, Illinois
  • 2005: Doctor of Veterinary Medicine with Honors – University of Illinois, Illinois
  • 1998-2001: Undergraduate – University of Florida, Gainesville, Florida

Dr. Brett Darrow, DVM, CCRP, Residency Trained in Small Animal Surgery



Dr. Darrow will soon join Capital Veterinary Specialists in September, 2017! He was born in Iowa and maintains strong ties to his family and blue-collar Midwest roots. After completing his undergraduate studies and working for one year as a chemical engineer, Dr. Darrow realized true fulfillment could come working with animals and enrolled at the University of Wisconsin. After earning his veterinary degree, Dr. Darrow performed a rotating internship followed by one year of general practice medicine in Bremen, Germany and emergency medicine in Ft. Lauderdale, FL. It was while volunteering at several local wildlife rehabilitation centers that Dr. Darrow realized how much he enjoyed the surgical aspects of animal care.

Dr. Darrow has completed his residency in small animal surgery at the University of Tennessee. His current research lies in 3D printing bone models and surgical guides to improve the accuracy and efficiency of orthopedic surgery. Dr. Darrow has authored several peer-reviewed scientific publications and has lectured nationally on topics ranging from surgical infection control to avian (bird) surgery. He is currently co-authoring a chapter in the newest edition of Small Animal Veterinary Surgery. His professional interests include minimally invasive surgery, wildlife and exotic animal surgery, and complex orthopedic procedures. He is a member of the Veterinary Society of Surgical Oncologists, Veterinary Orthopedic Society, and American Veterinary Medical Association.

Dr. Darrow is married to Dr. Janina Bartels, and together they look after Emely, a 15-year-old jack Russell terrier. In their free time, they enjoy virtually all outdoor pursuits including camping, mountain-biking, running, snorkeling, fishing, surfing, and snow-boarding. To Dr. Neihaus’ dismay, they are die-hard Packer fans.

  • September 2017!: Associate Surgeon – Capital Veterinary Specialists
  • 2014-2017: Small animal surgery residency – University of Tennessee, Knoxville, TN
  • 2013-2014: Emergency veterinarian – Lauderdale Veterinary Specialists, Ft. Lauderdale, FL
  • 2012-2013: General practice – Tierärtzeliche praxis van Loosen, Bremen, Germany
  • 2011-2012: Rotating internship – VCA Veterinary Care and Referral Center, Albuquerque, NM
  • 2007-2011: Doctor of Veterinary Medicine with Honors – University of Wisconsin, Madison, WI
  • 2000-2005: BSE Chemical engineering – University of Iowa, Iowa City, IA

Dr. Morgan Guoan, DVM

Emergency Medicine

Morgan Guoan

Dr. Morgan Guoan was born and raised in South Florida. In 1997, she attended college in Tennessee where she majored in Music business, was a collegiate athlete, captain and a member of the athletic advisory committee. After graduation, she continued working within the music industry for 8 years as well as became a professional athlete, playing professional football for 3 years.

In 2012, Morgan graduated from the College of Veterinary Medicine at University of Florida. While there she focused her interest on Emergency medicine and Critical care. She was also a student ambassador, Captain of Team Vet Med, a Science diet Hill’s food representative, a teacher’s assistant for anatomy, a FOLE leader and was a student member of the admissions committee.

Upon graduation, she was matched with Hollywood Animal Hospitals internship program in South Florida and went on to dedicate a full year to practicing medicine there while still maintaining a focus on Emergency medicine and critical care. It was also during this time that hospice and palliative care became a large part of the medicine she practices today.

In 2013, she moved to Tallahassee Florida and became a member of Northwood Animal Hospital as an emergency doctor. She then practiced general medicine before becoming a member of Capital Veterinary Specialist as an emergency doctor in 2017.

Outside of working at the clinic, she has continued her love for hospice and palliative care. She is also an active member of the admissions committee for University of Florida, College of Veterinary Medicine.

She and her partner are foster parents and share a 12 year old daughter. Her home consists of a rag-tag pack of 5 rescue dogs, an indoor mini pig, 3 rescue cats and a tortoise. In her free time, you will find her hiking or exploring around town enjoying her family time.

Dr. Matt Parisi, DVM

Rotating Intern


Dr. Parisi is originally from Staten Island, NY but has been bouncing around various parts of Florida for the past 23 years. He graduated from the University of Florida College of Veterinary Medicine in 2017 with his Doctorate of Veterinary Medicine and is now a rotating intern here at Capital Veterinary Specialists Jacksonville.

Dr. Parisi has a passion for advanced imaging, specifically CT and ultrasound, and hopes to become a boarded specialist in diagnostic imaging in the future. Outside of the clinic, Dr. Parisi enjoys hiking and camping with his cattle dog mix Zebu, diving in the ocean, and driving back roads with the windows down.

Dr. Kate Peper, DVM

Rotating Intern


Dr. Peper grew up in California, Nebraska, and Colorado. After completing her undergraduate degree at Duke University, Dr. Peper attended the University of Florida College of Veterinary Medicine and recently graduated with high honors with the class of 2017. Dr. Peper is performing a rotating internship at Capital Veterinary Specialists from 2017 to 2018. She has a special interest in diagnostic imaging and is involved with multiple research projects at her alma mater. She also recently received the University of Florida radiology student scholarship to further pursue her radiology interest.

Dr. Peper and her husband live in the Ponte Vedra area with their black lab, Olive, and their two horses, Akela and Lumiere. In her free time, Dr. Peper enjoys horseback riding (dressage), running, and reading.

Dr. Rick Alleman, DVM, PhD. Diplomate ABVP & ACVP

Clinical Pathologist


Dr. Rick Alleman received his DVM degree from Louisiana State University and practiced companion animal medicine and surgery for 9 years in a private, small animal practice in New Orleans. In 1987, he became board certified as a Diplomate of the American Board of Veterinary Practitioners with a specialty in companion animal practice. He was re-certified in 1997 and 2007.

Dr. Alleman completed a residency in Clinical Pathology at the University of Florida and became a Diplomate of the American College of Veterinary Pathologists with a specialty in Clinical Pathology and completed his PhD degree in molecular biology of vector-borne diseases. He is a former Professor, Service Chief, Resident Coordinator and Director of Laboratories at the University of Florida, College of Veterinary Medicine, where he was on faculty for 20 years. He is currently Manager of Lighthouse Veterinary Consultants. He is a consultant and serves on the Advisory Boards for IDEXX Laboratories, Merck Animal Health, and Zoetis.

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