LVVSC doctors provide knowledgeable, skilled, and compassionate care. Our doctors and staff set high standards, and challenge themselves daily to meet them. We understand the importance of the patient to you, and we greatly appreciate your trust in us to deliver optimum results.

Our board certified veterinarians have in-depth training and are highly experienced. They are supported by other skilled staff, including licensed rehabilitation doctors, nurses, and technicians who are well prepared to deliver the care your pet deserves. They monitor patients around-the-clock while providing timely communication throughout the process.

Internal Medicine

Jacob Herr, DVM

Small Animal Internal Medicine Residency: University of Pennsylvania 2023

Small Animal Rotating Internship: University of Tufts Cummings School of Veterinary Medicine 2020

Doctor of Veterinary Medicine: University of Minnesota College of Veterinary Medicine 2019

Bachelor of Arts: Saint John’s University 2015

Dr. Herr’s Interests: Professional – Renal disease, infectious disease, endocrinology and hematology.

Personal – Hiking, MN sports teams, ice fishing, golf

Adam Mordecai , DVM, MS, DACVIM (SA)

Master of Veterinary Science Washington State University 2010

Diplomate American College of Veterinary Medicine 2008

Doctor of Veterinary Medicine University of Georgia College of Veterinary Medicine 2003

Bachelor of Science University of Georgia College of Agriculture and Environmental Sciences in Agriculture Athens, GA 2000 Magna Cum Laude, with Honors


Professional – Urology, Ectopic ureters, Interventional procedures, Endocrinology, Hepatic and GI diseases

Personal – Backpacking, Rowing, Mountain Biking, Snowboarding


Andrew Vaughan, DVM, MS, DACVIM Oncology

Dr. Andrew Vaughan was born in Halifax, Nova Scotia and was trained at the University of Prince Edward Island in eastern Canada. A 2002 veterinary graduate, Dr. Vaughan went on to complete an internship and oncology residency at North Carolina State University, before joining the LVVSC team as head of medical oncology in 2006. Along the way, Dr. Vaughan was on the executive board of the Veterinary Cancer Society and served as the chair of the board of the Animal Foundation. While working at LVVSC, Dr. Vaughan has managed numerous clinical trials with a particular research interest on canine osteosarcoma and melanoma and targeted chemotherapeutics. Outside of work, Dr Vaughan enjoys spending time with his wife, Leann, and their three-legged dog Chance. Dr. Vaughan’s other love is the great outdoors, which he enjoys most on bicycle, skis or snowshoes.

Medical Oncologist, Las Vegas Veterinary Specialty Center 2006 – present

Board-certified in Oncology, American College of Veterinary Internal Medicine

Numerous scientific publications in fields of research including canine lymphoma and leukemia, osteosarcoma, and targeted chemotherapeutics

Special interests – investigation of novel targeted therapies for canine and feline cancers

Member of the Executive Board of the Animal Foundation, 2012 – present

Member of the Executive Board for the Veterinary Cancer Society, 2010 – 2013

Medical Oncology Residency, North Carolina State University, 2006

Rotating Small Animal Medicine & Surgical Internship, North Carolina State University, 2002-2003

Veterinary College, University of Prince Edward Island, DVM, 2002

University of California, San Diego, MS, 1998

Saint Mary’s University, BS, 1996

Holly Burr, DVM, DACVIM Oncology

Las Vegas Veterinary Specialty Center, 2011- present

VCA Animal Care Center of Sonoma County, 2010-2011

Residency in Medical Oncology, Tufts University, 2007-2010

Internship in Medical Oncology, Animal Cancer Care Clinic, 2006-2007

Hospitalist, Veterinary Specialists of South Florida, 2006-2007

Internship in Internal Medicine and Surgery, Veterinary Specialists of South Florida, 2005-2006

University of Wisconsin – Madison, DVM, 2005

University of Utah, BS, 1999

Stephanie Byrne, DVM, MVetMed (Practice Limited to Medical Oncology)

Las Vegas Veterinary Specialty Center, 2020 – present

Fetch Specialty & Cancer Veterinary Centers, Naples, FL, 2017-2019

Residency in Medical Oncology, Royal Veterinary College, UK, 2014-2017

Master of Veterinary Medicine, Royal Veterinary College, UK, MVetMed, 2017

Internship in Medical Oncology, Animal Cancer Care Clinic, Ft. Lauderdale, FL, 2013-2014

Internship in Medical Oncology, The Oncology Service (TOS), Leesburg, VA, 2012-2013

Rotating Small Animal Medicine & Surgical Internship, University of Missouri, 2011-2012

Washington State University College of Veterinary Medicine, DVM, 2011

University of California, Berkeley, BS, 2007

Outside interests include competitive running, hiking, camping, cross-country road trips, and canine agility.


William Weinstein, DVM, MS, DACVO

Special interests – mixed animal ophthalmology, including treatment of small and large animals, as well as exotic patients

Board Certified in Ophthalmology, American College of Veterinary Ophthalmology

Las Vegas Veterinary Specialty Center, 2009 – present

Research and publications involve canine Glaucoma and identification of molecular factors (matrix metalloproteinases) associated with the disease< Involved in research on new therapies for treatment of equine fungal keratitis Completed residency in ophthalmology, University of Georgia, College of Veterinary Medicine in Athens, GA, 2009 MS, veterinary pathology, University of Georgia, College of Veterinary Medicine in Athens, GA, 2009 Medicine and surgical internship at Long Island Veterinary Specialists, 2005 St. George’s University, School of Veterinary Medicine, 2003< BA, biology and veterinary technology<


David R. Mason, B. Vet. Med, MRCVS, DACVS, DECVS, DACVSMR

Special interests – arthroscopy, elbow dysplasia, thoracic surgery, porto-systemic shunts

Board Certified, American College of Veterinary Surgeons 2006

European College of Veterinary Surgeons 2007

American College of Veterinary Sports Medicine and Rehabilitation 2014

Staff Surgeon, Las Vegas Veterinary Referral Center, 2005 – present

Associate Veterinarian, Mobile Surgical Practice, Las Vegas Veterinary Referral Center, 2005

Small Animal Orthopedic Surgery Clinician, 2005 – present

Small Animal Surgical Residency, Iowa State University, 2004

Research Associate, JD Wheat Veterinary Orthopedic Research Laboratory, University of California Davis, 2003

The Royal Veterinary College, University of London, BVM (Honours), 1999

David Mason, B Vet Med (Honours), MRCVS, is a Board Certified Small Animal Veterinary Surgeon specializing in Orthopedic, Neurologic, Oncologic and General Soft Tissue Surgical Procedures.

A native of Northern England who grew up on a dairy farm and has been involved with animals his entire life, Dr. Mason earned his veterinary degree with honours from the Royal Veterinary College, University of London in 1999. After graduation he moved across the Atlantic Ocean in order to pursue a Small Animal Medicine and Surgery Internship at Kansas State Veterinary Medical Teaching Hospital.

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Joshua Rexing, DVM, Practice Limited to Surgery

Special interests – fracture repair, gastrointestinal surgery, degenerative disc disease

Las Vegas Veterinary Referral Center, 2011 – Present

Northeast Indiana Veterinary Emergency and Specialty Hospital, 2008-2011

Small Animal Surgical Residency, Iowa State University, 2005-2008

Small Animal Rotating Internship, University of Illinois, 2004-2005

Small Animal Emergency Clinician and Surgery Intern, Northeast Indiana Veterinary Emergency and Specialty Hospital, 2003-2004

Small Animal Private Practice, Petsburgh Animal Hospital, Lafayette, IN, 2001-2003

Purdue University School of Veterinary Medicine, DVM, 1997-2001

Purdue University, BS in Animal Sciences, 1992-1997< Dr. Rexing has written and collaborated on several publications, and spoken at many local, state, and national meetings.

Suzanne L. Hunter, DVM, DACVS

Special Interests: oncologic surgery, wound management, thoracic surgery, urogenital surgery, gastrointestinal surgery, portosystemic shunts.

Board Certified, American College of Veterinary Surgeons, 2004

Staff Surgeon, Las Vegas Veterinary Specialty Center, January 2016-present

Staff Surgeon, Gulf Coast Veterinary Specialists, Houston TX, September 2004-December 2015

Staff Surgeon, Oradell Animal Hospital, Paramus, NJ, August 2003-August 2004

Small Animal Surgical Residency, The Ohio State University, 2000-2003

Small Animal Rotating Internship, Oradell Animal Hospital, Oradell, NJ, 1999-2000

Cornell University College of Veterinary Medicine, DVM, 1995-1999

Cornell University, BS (Biology), 1991-1995

Dr. Hunter has presented at local and national continuing education meetings on various soft tissue topics. She has also written and collaborated on several publications in peer-reviewed journals. When not working, she enjoys spending time with her family. Their dog, cats, and horses keep everyone very busy.

Lauren Sanders, DVM, DACVS-SA

Special interests: Arthroscopy and regenerative medicine, gastrointestinal surgery, orthopedic disease and fracture repair

Staff Surgeon, Las Vegas Veterinary Specialty Center, August 2018 to present

Small Animal Surgical Residency, Veterinary Specialty & Emergency Center-Levittown, PA, 2015-2018

Small Animal Surgical Internship, Central Texas Veterinary Specialty Hospital-Austin, TX 2014-2015

Small Animal Rotating Internship, Carolina Veterinary Specialists-Charlotte, NC 2013-2014

University of Missouri College of Veterinary Medicine, DVM, 2010-2013

Oklahoma State University, BS in Animal Science, 2006-2010

Dr. Sanders is originally from Missouri. Her free time is spent outdoors with her dog and riding her Arabian horse, April.

Nick Rappa, DVM, DACVS-SA

Special interests – open wound management, orthopedics/fracture repair and trauma surgery

Board Certified, American College of Veterinary Surgeons – Small Animal

Las Vegas Veterinary Specialty Center March 2020 – present

Fox Valley Animal Referral Center – 2019

Midwest Veterinary Referral Center – 2016 –2018

Small Animal Surgical Residency, Blue Pearl Veterinary Partners 2013-2016

Small Animal Surgical Internship, Dallas Veterinary Surgical Center 2012-2013

Small Animal Rotating Internship, LVVSC 2011-2012

Iowa State University, Doctor of Veterinary Medicine, 2007-2011

Drake University, Bachelors degree in Biochemistry, Cell and Molecular Biology, 2003-2007

India C. Wood, DVM, MS, DACVS (SA)

Ohio State University, Columbus, OH- Residency, 2001-2004

Ohio State University, Columbus, OH- Masters, 2001-2004

Angell Animal Medical Center- Jamaica Plain, MA- Rotating Intern, 2000-2001

University of Illinois , College of Veterinary Medicine 1996-2000

University of Richmond, Richmond, VA, — BA, 1995

CERTIFICATION Board certification in the American College of Veterinary Surgeons 2005

Brooke Fourthman, DVM (Small Animal Surgical Resident)

Small Animal Surgical Residency, Las Vegas Veterinary Specialty Center 2022-Present

Small Animal Surgical Internship, Las Vegas Veterinary Specialty Center 2021-2022

Small Animal Surgical Internship, Veterinary Specialty Center 2020-2021

Small Animal Rotating Internship, Pittsburgh Veterinary Specialty and Emergency Center 2019-2020

Purdue University, Doctor of Veterinary Medicine 2015-2019

Purdue University, 2012-2015

Pedro J. Olivencia-Morell, DVM (Small Animal Surgical Resident)

Dr Olivencia-Morell is originally from Puerto Rico. He enjoys playing sports, outdoors and spending time with his wife, daughter and French Bulldog named Kai Malú.

Clinical Interest: Orthopedic diseases and fracture repairs. Non-invasive surgical procedures. Although he enjoys all aspects of small animal surgery.

2022 – 2023 Internship, Small Animal Surgery – Las Vegas Veterinary Specialty Center, Las Vegas, NV
2021 – 2022 Internship, Small Animal Surgery- BluePearl Specialty and Emergency Pet Hospital, Tampa, FL (Service locations: Tampa, Clearwater, Brandon and Sarasota)
2020 – 2021 Rotating Internship, Small Animal Medicine & Surgery- BluePearl Specialty and Emergency Pet Hospital, Atlanta, GA
2016 – 2020 Doctor of Veterinary Medicine Tuskegee University- College of Veterinary Medicine
2012 – 2016 Pre-Veterinary Medicine Studies University of Puerto Rico- Mayagüez Campus

Jaclyn Gremley, DVM (Small Animal Surgical Resident)

  • DVM/MPH from St. George’s University in Grenada, West Indies
  • Clinical year at Texas A&M University
  • Rotating Internship at BluePearl in Sandy Springs, GA
  • Surgery specialty internship at Veterinary Orthopedic & Sports Medicine Group (VOSM) in Annapolis, MD
  • Hobbies include: Lifting (weights), snacking, MMA/UFC, football, sports in general

  • Neurology

    Franziska Fitz, DVM, GPCertSAS, DACVIM (Neurology/ Neurosurgery)

    Dr. Fitz was born and raised in South Germany. She received the majority of her veterinary school training in Brno, Czech Republic where she earned her masters degree in veterinary medicine. She went on to complete her general practitioner certificate in small animal surgery from the European School of Veterinary Postgraduate Studies in Munich and Frankfurt, Germany. In 2013, she obtained her Educational Commission for Foreign Veterinary Graduates, certified by the American Veterinary Medical Association. She completed a surgical internship at Hollywood Animal Hospital, followed by a neurological internship and a three-year residency at Southeast Veterinary Neurology, Miami Florida where she had been trained in all aspects of neurology and neurosurgery. Afterwards, she remained in South Florida working at Southeast Veterinary Neurology for almost 2 years before joining LVVSC’s Neurology team in July 2021. Her special interests are in Neurosurgery and Neuroradiology.

    Outside of work she enjoys hiking and running with her dogs, as well as loves mountain biking and travelling with her husband.

    Dana Gietzen, DVM, Practice Limited to Neurology

    Dr. Dana Gietzen was born and raised in Minot, North Dakota. She attended North Dakota State University for her undergraduate studies in Microbiology (Go Bison!). She then obtained her veterinary degree from Iowa State University. After graduation, she completed a one year internship at ISU in critical care and emergency. This was followed by a one year surgical internship at Metropolitan Veterinary Hospital in Akron, Ohio. It was here where her interest in neurology began and she stayed on to complete a Neurology/Neurosurgery Residency.

    After a lifetime of cold weather, Dr. Gietzen decided to try her hand at hotter temperatures and moved to Austin, Texas. She worked at a private practice for over three years before joining the team at LVVSC. She enjoys treating complicated seizure cases, CNS inflammatory disease, and all aspects of neurosurgery. When not at work, she is often spending time with her dog Maija (loves to paddle board) ad two cats, Frankenstein and Igor.


    Diagnostic Imaging/Radiology


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