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Our Veterinarians

Dr. Jonathan Blakely is a veterinarian in our surgery service.
Jonathan Blakely
DVM
Surgery
Jonathan Blakely
DVM
Surgery
Servicing Locations
Dr. Jonathan Blakely likes all aspects of surgery. His particular clinical interest is orthopedics, especially treating fractures.
  • Residency, Small Animal Surgery, Mississippi State University, Starkville
  • Internship, Small Animal Surgery, Dallas Veterinary Surgical Center, TX
  • Internship, Small Animal Medicine & Surgery, South Texas Veterinary Specialists, Stone Oak
  • Doctor of Veterinary Medicine, Texas A&M University, College Station
  • Bachelor of Science, Texas A&M University, College Station
Dr. Blakely’s favorite pastime is spending time with his wife and kids. He also enjoys playing music, including guitar, banjo and the flute.
Dr. Bradley Book is board certified in veterinary emergency and critical care medicine.
Bradley Book
DVM, DACVECC, DABVP (Canine & Feline Practice)
Critical Care
Bradley Book
DVM, DACVECC, DABVP (Canine & Feline Practice)
Board Certified in Veterinary Emergency & Critical Care
Critical Care
Servicing Locations
Dr. Bradley Book enjoys all aspects of emergency medicine.
  • Diplomate, American Board of Veterinary Practitioners (Canine & Feline Practice)
  • Diplomate, American College of Veterinary Emergency & Critical Care
  • Residency, Emergency & Critical Care, South Texas Veterinary Specialists, San Antonio
  • Internship, Small Animal Medicine & Surgery, Animal Medical Center, New York City
  • Doctor of Veterinary Medicine, Texas A&M University, College Station
Dr. Book spends his free time with his two children and their pets, golden retriever Trout, and cat Rover.
Dr. Walter Burghardt, Jr. is board certified in veterinary behavioral medicine.
Walter Burghardt
DVM, PhD, DACVB
Behavioral Medicine
Walter Burghardt
DVM, PhD, DACVB
Board Certified in Veterinary Behavioral Medicine
Behavioral Medicine
Servicing Locations
Dr. Walter Burghardt has over 35 years of veterinary behavioral medicine experience treating dogs, cats and exotics. His particular clinical interest is treating behavioral problems that strain the bond between pet and owner.
  • Diplomate, American College of Veterinary Behaviorists
  • Doctor of Philosophy, Biopsychology, University of Maryland, College Park
  • Doctor of Veterinary Medicine, University of Florida, Gainesville
  • Master of Arts, Florida Atlantic University, Boca Raton
  • Bachelor of Arts, Florida Atlantic University, Boca Raton
Dr. Burghardt is married with three grown sons. His favorite pastimes include flying, bicycling, traveling and hiking. He loves dogs, cats and tropical fish.
Photo coming soon.
Oscar Carballo
DVM
Surgery
Oscar Carballo
DVM
Surgery
Servicing Locations
Dr. Oscar Carballo Jr. is a surgical intern. He enjoys every aspect of surgery but has a particular interest in orthopedic and minimally invasive procedures.
  • Internship, Small Animal Surgery, Coral Springs Animal Hospital, FL
  • Doctor of Veterinary Medicine, Auburn University, AL
  • Bachelor of Science, Florida International University, Miami
Dr. Carballo Jr. enjoys mountain bike riding, scuba diving, working out, spending time with family, traveling and fishing. He has a chocolate lab named Shamus.
Dr. Monica Chwala is a doctor in our internal medicine service.
Monica Chwala
DVM
Internal Medicine
Monica Chwala
DVM
Internal Medicine
Servicing Locations
Dr. Monica Chwala’s clinical interests include the treatment of immune-mediated and infectious diseases, endocrine disorders, liver and kidney/urinary diseases, gastrointestinal disease and respiratory disease. She particularly enjoys the use of minimally invasive procedures to examine and treat many conditions, like urinary incontinence or stones.
  • Residency, Small Animal Internal Medicine, University of Wisconsin, Madison
  • Internship, Small Animal Medicine & Surgery, North Carolina State University, Raleigh
  • Doctor of Veterinary Medicine, Kansas State University, Manhattan
  • Associate of Applied Science, Veterinary Technology, Fox College, Tinley Park IL
  • Bachelor of Science, Finance, Economics, University of Illinois, Normal
Dr. Chwala loves new experiences and adventures, meeting people, good food, horseback riding and sports. She has two Weimaraners, Lexy and Addie.
Photo coming soon.
Abigail DeRouen
DVM
Associate Veterinarian
Abigail DeRouen
DVM
Associate Veterinarian
Servicing Locations
Dr. Abigail DeRouen is a small animal medicine & surgery intern.
  • Doctor of Veterinary Medicine, Louisiana State University, Baton Rouge
  • Bachelor of Science, Animal Science, Louisiana State University, Baton Rouge
Dr. Meredith Esterline is board certified in small animal surgery. She is holding an orange tabby cat.
Meredith Esterline
DVM, MS, DACVS-SA
Surgery
Meredith Esterline
DVM, MS, DACVS-SA
Board Certified in Veterinary Surgery-Small Animal
Surgery
Servicing Locations
Dr. Meredith Esterline’s particular interests include thoracic, neurological, soft tissue and fracture repair surgeries.
  • Diplomate, American College of Veterinary Surgeons-Small Animal
  • Residency, Small Animal Surgery, Kansas State University, Manhattan Internship, Surgery, University of Tennessee, Knoxville
  • Internship, Small Animal Medicine & Surgery, Garden State Veterinary Specialists, Tinton Falls NJ
  • Master of Science, Texas A&M, College Station
  • Doctor of Veterinary Medicine, Texas A&M, College Station
Dr. Esterline volunteers her time as a Girl Scout leader and Faith Formation instructor. Her favorite pastimes include refinishing furniture, stained glass and spending time with her family.
Dr. James Giles is board certified in small animal surgery.
James T. Giles III
DVM, MS, DACVS-SA
Surgery
James T. Giles III
DVM, MS, DACVS-SA
Board Certified in Veterinary Surgery-Small Animal
Surgery
Servicing Locations
A retired U.S. Army lieutenant colonel, Dr. James Giles enjoys arthroscopy and laparoscopy and is particularly interested in orthopedic and neurologic conditions in working dogs, especially surgical management of degenerative lumbosacral stenosis. While serving as a military veterinary surgeon, he became experienced in performing endodontic repairs and advanced dentistry. He also introduced the use of negative pressure wound therapy for use in military working dogs and treated the first dogs in combat with this modality.
  • Diplomate, American College of Veterinary Surgeons-Small Animal
  • Residency, Small Animal Surgery, Oklahoma State University, Stillwater
  • Master of Science, Veterinary Biomedical Science, Oklahoma State University, Stillwater
  • Doctor of Veterinary Medicine, Oklahoma State University, Stillwater
Dr. Giles’ wife is also a veterinarian, and they have two children. His favorite pastimes include outdoor activities, endurance fitness events and traveling. The family pets are Lucy, a golden doodle, and Mia, a poodle.
Dr. Lauren Guerra is an emergency medicine veterinarian.
Lauren Guerra
DVM
Emergency Medicine
Dr. Lauren Guerra has worked in Texas, Belize, Guatemala and South Africa with a wide variety of species to include white tail deer, cheetahs, African grey parrots and cape buffaloes.
  • Doctor of Veterinary Medicine, Texas A&M University, College Station
  • Bachelor of Science, Biomedical Science, Texas A&M University, College Station
Dr. Guerra enjoys singing, Krav Maga, a form of self-defense, traveling, hiking and wildlife and nature photography. She has two dogs, a border collie and shepherd/collie mix, and two Quaker parrots.
Dr. John Haller is board certified in veterinary radiology. He is holding a turtle.
John Haller
DVM, DACVR
Diagnostic Imaging
John Haller
DVM, DACVR
Board Certified in Veterinary Radiology
Diagnostic Imaging
Servicing Locations
Dr. John Haller's clinical interests include abdominal ultrasonography, and he has published research on diagnosing disorders of the spleen and reproductive system. He also enjoys cross-sectional imaging, particularly thoracic CT and oncologic and neurological brain diseases as visualized with magnetic resonance imaging.
  • Diplomate, American College of Veterinary Radiology
  • Residency, Radiology, Gulf Coast Veterinary Specialists, Houston TX
  • Internship, Small Animal Medicine & Surgery, Southern Arizona Veterinary Specialty & Emergency Center, Tucson
  • Doctor of Veterinary Medicine, Texas A&M University, College Station
  • Bachelor of Science, Biology, University of Texas at San Antonio
Dr. Geoff Hennig is board certified in veterinary surgery.
Geoff Hennig
DVM, MS, DACVS-SA
Surgery
Geoff Hennig
DVM, MS, DACVS-SA
Board Certified in Veterinary Surgery-Small Animal
Surgery
Servicing Locations
Dr. Geoff Hennig was a production artist with a focus on biological and medical illustration before attending veterinary school. He has served on the surgical faculty at Louisiana State University as a visiting assistant professor. His research interests have been principally in the area of canine orthopedic diseases including the effects of injectable local anesthetics on cartilage health.
  • Diplomate, American College of Veterinary Surgeons-Small Animal
  • Master of Science, Veterinary Sciences, Louisiana State University, Baton Rouge
  • Residency, Small Animal Surgery, Louisiana State University, Baton Rouge
  • Internship, Small Animal Medicine & Surgery, University of Georgia, Athens
  • Clinical Rotation, University of Georgia, Athens
  • Doctor of Veterinary Medicine, Ross University, St Kitts & Nevis, West Indies
Photo coming soon.
Katelyn Hickman
DVM
Emergency Medicine
Katelyn Hickman
DVM
Emergency Medicine
Servicing Locations
Dr. Katelyn Hickman is part of our emergency medicine training program for clinicians. She is dedicated to providing excellent medical care for patients in an emergency setting. Her interests include stabilizing and managing trauma patients, as well as ophthalmology and neurology.
  • Doctor of Veterinary Medicine, Oklahoma State University, Stillwater
  • Bachelor of Science, Agricultural Science and Natural Resources, Oklahoma State University, Stillwater
Dr. Hickman enjoys kayaking, pyrography and hiking with her dog, Miss Lemon Drop.
Dr. Sarah Israel is board certified in small animal surgery. She is holding a small dog.
Sarah K. Israel
DVM, DACVS-SA
Surgery
Sarah K. Israel
DVM, DACVS-SA
Board Certified in Veterinary Surgery-Small Animal
Surgery
Servicing Locations
Dr. Sarah Israel enjoys all aspects of surgery.
  • Diplomate, American College of Veterinary Surgeons-Small Animal
  • Residency, Small Animal Surgery, Texas A&M University, College Station
  • Internship, Small Animal Medicine & Surgery, The Ohio State University, Columbus
  • Doctor of Veterinary Medicine, Texas A&M University, College Station
Dr. Sukjung Lim is an emergency medicine veterinarian.
Sukjung Lim
DVM
Emergency Medicine
Sukjung Lim
DVM
Emergency Medicine
Servicing Locations
Dr. Lim worked in South Korea as a government veterinarian at the Seoul Research Institute of Public Health and Environment and in general practice before coming to the States. His clinical interests include diagnostic ultrasound, neurology, internal medicine, clinical pharmacology and emergency surgery, particularly laceration repair and gastrointestinal foreign body removal.
  • Clinical Rotation, Louisiana State University, Baton Rouge
  • Doctor of Veterinary Medicine, Konkuk University, Seoul, Korea
Dr. Lim enjoys tennis, jogging and movies. He has two older sibling cats, Miwoo and Boru. Slightly challenging companions but with him since their birth, the cats made the long journey from South Korea to the U.S.
Photo coming soon.
Amanda Marie Marin
DVM
Associate Veterinarian
Amanda Marie Marin
DVM
Associate Veterinarian
Servicing Locations
Dr. Amanda Marin is a small animal medicine & surgery intern. She enjoys all that emergency medicine has to offer with a special interest in wound management and client education.
  • Clinical Rotation, Michigan State University, East Lansing
  • Doctor of Veterinary Medicine, Ross University, St. Kitts & Nevis, West Indies
  • Bachelor of Science, Animal Science, Texas A&M University, College Station
Away from work, Dr. Marin enjoys weight lifting and outdoor activities such as kayaking and hiking. She has a cat named Norman.
Dr. Mary Ellen Matthews is an emergency medicine veterinarian. She is sitting on a chair next to a brown dog.
Mary Ellen Matthews
DVM
Emergency Medicine
Mary Ellen Matthews
DVM
Emergency Medicine
Servicing Locations
Dr. Mary Ellen Matthews is an experienced emergency medicine clinician. Her particular interests include endoscopic foreign body retrieval, trauma cases with multiple injuries, critical care and quality of life conversations.
  • Internship, Small Animal Medicine & Surgery, Iowa State University, Ames
  • Doctor of Veterinary Medicine, Kansas State University, Manhattan
Dr. Matthews enjoys baking, hiking, biking and a good book. She and her boyfriend live on a few acres of land where they grow vegetables and take care of two dogs and two horses.
Dr. Rachel Melvin is a small animal medicine and surgery intern.
Rachel Melvin
DVM
Surgery
Rachel Melvin
DVM
Specialty Intern
Surgery
Servicing Locations
Dr. Rachel Melvin is a surgical intern. She enjoys zoo and exotics medicine, surgery, and treating wounds and abscesses.
  • Internship, Small Animal Medicine & Surgery, BluePearl Specialty and Emergency Pet Hospital, Tampa FL
  • Doctor of Veterinary Medicine, Michigan State University, East Lansing
  • Bachelor of Science, Biology, University of North Carolina, Chapel Hill
  • Bachelor of Arts, Anthropology, University of North Carolina, Chapel Hill
Dr. Melvin taught herself to crochet, braid paracord and sew surgery caps. She has two cats, Smudge and Ouija.
Dr. Kimberly Menard is board certified in veterinary oncology.
Kimberly Menard
DVM, MS, DACVIM (Oncology)
Oncology
Kimberly Menard
DVM, MS, DACVIM (Oncology)
Board Certified in Veterinary Oncology
Oncology
Servicing Locations
Dr. Kimberly Menard believes there is an “amazing and unique bond” among oncology patients, clients and veterinarians. Her particular clinical interests include histiocytic diseases and lymphoma, and she’s excited about the advances in immunotherapy.
  • Diplomate, American College of Veterinary Internal Medicine (Oncology)
  • Master of Science, Biomedical Science, University of Missouri, Columbia
  • Residency, Oncology, University of Missouri, Columbia
  • Internship, Small Animal Medicine & Surgery, South Texas Veterinary Specialists, San Antonio
  • Doctor of Veterinary Medicine, Louisiana State University, Baton Rouge
  • Bachelor of Science, Animal Science, Louisiana State University, Baton Rouge
Dr. Menard enjoys watching LSU football, travelling, hiking and spending time with Zoe, her very energetic mixed breed dog.
Photo coming soon.
Moiz Niaz
DVM
Emergency Medicine
Moiz Niaz
DVM
Emergency Medicine
Servicing Locations
Dr. Moiz Niaz is part of our emergency medicine training program for clinicians. He has worked in emergency medicine as an assistant, technician and now as a doctor. He enjoys using his skills to repair wounds and is also interested in animal behavior and illness assessment and treatment.
  • Doctor of Veterinary Medicine, UAF, Faisalabad, Pakistan
Dr. Niaz currently does have any pets, but he loves traveling and is an avid rock climber.
Dr. Alicia Niedzsweck is board certified in veterinary emergency and critical care.
Alicia Niedzwecki
DVM, DACVECC
Critical Care
Alicia Niedzwecki
DVM, DACVECC
Board Certified in Veterinary Emergency & Critical Care
Critical Care
Servicing Locations
Dr. Alicia Niedzwecki’s clinical interests include treating snakebites, acute kidney injury, Addison’s disease, immune-mediated diseases, coagulopathies and congestive heart failure. Procedures she enjoys include temporary tracheostomies, GI endoscopies and pericardiocenteses.
  • Diplomate, American College of Veterinary Emergency & Critical Care
  • Residency, Small Animal Emergency & Critical Care, South Texas Veterinary Specialists, San Antonio TX
  • Internship, Small Animal Medicine & Surgery, South Texas Veterinary Specialists, San Antonio TX
  • Doctor of Veterinary Medicine, Texas A&M University, College Station
  • Bachelor of Science, Biomedical Science, Texas A&M University, College Station
Dr. Niedzwecki enjoys tennis, gardening and spending time with her family and pets, Xena, a German shepherd, and Zoe, a Siamese cat.
Dr. Douglas Owens is a veterinarian in our internal medicine service. Here he is holding a golden lab.
Douglas Owens
DVM, MS
Internal Medicine
Douglas Owens
DVM, MS
Internal Medicine
Servicing Locations
Dr. Douglas Owens has over twenty years of experience in the veterinary field to include the U.S. Army Veterinary Corps, specialty medicine, public health, research, marine mammal, exotics and private practice. He has also held instructor positions at University of Illinois, Eastern Kentucky University, and Auburn University. He is skilled in all aspects of both critical care and internal medicine.
  • Residency, Small Animal Internal Medicine, University of Illinois, Urbana-Champaign
  • Master of Science, Biology, Eastern Kentucky University, Richmond
  • Doctor of Veterinary Medicine, Auburn University, AL
  • Bachelor of Science, Animal Science, Eastern Kentucky University, Richmond
Dr. Owens enjoys volunteering for youth programs and with his church. His interests include music, classic cars, road cycling, hiking/backpacking, camping, wilderness survival and all things water sport related. Married with four children, the family has four pets: great Pyrenees Koda, tortoiseshell cat Meow Meow, teacup poodle Shadow, and guinea pig George.
Dr. Stephen Spence is a resident in our surgery service. He is holding a black dog.
Stephen Spence
MVB
Surgery
Stephen Spence
MVB
Resident
Surgery
Servicing Locations
Dr. Stephen Spence is a resident in our surgery service. He has a strong interest in orthopedic procedures, in particular fracture management cases.
  • Internship, Small Animal Surgery, BluePearl Veterinary Partners, San Antonio
  • Internship, Small Animal Medicine & Surgery, VCA Animal Specialty Group, Los Angeles CA
  • Bachelor of Veterinary Medicine, University College Dublin, Ireland
  • Bachelor of Science, Animal Science, University of Massachusetts, Amherst
Dr. Stephen Spence enjoys scuba diving, traveling the world with his wife, who is also a veterinarian, and watching television shows and movies with the family pit bull/Australian shepherd mix Finn.
Dr. Catherine Strey is a veterinarian in our critical care service. She is hugging a yellow lab.
Catherine Strey
DVM
Critical Care
Catherine Strey
DVM
Critical Care
Servicing Locations
Dr. Catherine Strey enjoys all aspects of critical care medicine.
Photo coming soon.
Adeline Wadel
DVM
Emergency Medicine
Adeline Wadel
DVM
Emergency Medicine
Servicing Locations
Dr. Adeline E. Wadel is part of our emergency medicine training program for clinicians. Emergency medicine often brings in cases that are stressful and emotional for pet owners, and Dr. Wadel cares deeply about helping her clients through that process.
  • Doctor of Veterinary Medicine, Auburn University, Auburn AL
  • Bachelor of Science, Zoology, Kent State University, Kent OH
In her spare time, Dr. Wadel enjoys being actively involved in her local church, reading, playing music and cooking breakfast. She has a Siamese cat named Lil Bean who walks on a leash and loves to visit parks.
Dr. Jennifer Wiley is board certified in veterinary oncology. She is hugging a brown dog.
Jennifer Wiley
DVM, DACVIM (Oncology)
Oncology
Jennifer Wiley
DVM, DACVIM (Oncology)
Board Certified in Veterinary Oncology
Oncology
Servicing Locations
Dr. Jennifer Wiley was the first full-time, board-certified oncologist in San Antonio. As a child, Dr. Wiley lost her mother to breast cancer, so she felt fortunate to participate in a program during her residency that provided treatment for local shelter dogs with mammary tumors. Their treatment and tumors were used in many different research studies to further our knowledge of cancer in both dogs and women.
  • Diplomate, American College of Veterinary Internal Medicine (Oncology)
  • Residency, Oncology, University of Pennsylvania, Philadelphia Internship, Small Animal Medicine & Surgery, University of Illinois, Urbana-Champaign
Dr. Fred Williams, Jr. is board certified in veterinary surgery. He is on his knees making eye contact with a yellow lab.
Fred Williams, Jr.
DVM, DACVS
Surgery
Fred Williams, Jr.
DVM, DACVS
Board Certified in Veterinary Surgery
Surgery
Servicing Locations
Dr. Fred Williams, Jr. grew up working in his dad’s veterinary clinic. He is the cofounder of South Texas Veterinary Specialists.
  • Diplomate, American College of Veterinary Surgeons
  • Residency, Small Animal Surgery, University of Tennessee, Knoxville Internship, Small Animal Medicine & Surgery, North Carolina State University, Raleigh
  • Doctor of Veterinary Medicine, Texas A&M University, College Station Bachelor of Science, Veterinary Science, Texas A&M University, College Station
Dr. Williams enjoys spending time outdoors with his wife of more than 20 years, Michelle, and their two sons, Jacob and Jackson.
Dr. Katheryn Wolfe is board certified in veterinary neurology.
Katheryn Wolfe
DVM, DVSc, DACVIM (Neurology)
Neurology, Neurosurgery
Katheryn Wolfe
DVM, DVSc, DACVIM (Neurology)
Board Certified in Veterinary Neurology
Neurology, Neurosurgery
Servicing Locations
Dr. Katheryn Wolfe loves treating a patient with seizures in the morning then performing surgery on a paralyzed patient in the afternoon. The field of neurology continues to fascinate her, especially inflammatory conditions like meningoencephalitis and meningomyelitis, and she continues to strive for answers to the tough questions: Why? What triggers this condition? Do genetic or environmental factors play a role?
  • Diplomate, American College of Veterinary Internal Medicine (Neurology)
  • Doctor of Veterinary Science, Neurology & Neurosurgery, University of Guelph, Ontario, Canada
  • Internship, Small Animal Medicine & Emergency, Carolina Veterinary Specialists, Charlotte NC
  • Internship, Neurology & Neurosurgery, Dallas Veterinary Surgical Center, TX
  • Doctor of Veterinary Medicine, Texas A&M University, College Station
  • Bachelor of Science, Biology, George Washington University, Washington D.C.
Dr. Wolfe loves to spend time with her husband, two kids and four dogs: Bella, Watson, Millie and Emma. Her personal hobbies include fishing and working out, specifically participating in triathlons.

Technicians (VTS)

Photo coming soon.
Mary Saunders
RVT, VTS (ECC)
Critical Care
Mary Saunders
RVT, VTS (ECC)
Veterinary Technician Specialist (Emergency & Critical Care)
Critical Care
Servicing Locations
Mary treats each of her patients as if they were her own pets, striving to give the best possible care. She finds the fast pace of emergency care rewarding, and finds cardiopulmonary resuscitation particularly rewarding.