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Our Veterinarians

Dr. Madeline Aghamalian is part of our emergency medicine training program for clinicians.
Madeline Aghamalian
DVM
Emergency Medicine
Madeline Aghamalian
DVM
BluePearl Veterinarian
Emergency Medicine
Servicing Locations
Dr. Madeline Aghamalian is part of our emergency medicine training program for clinicians. She finds conditions like gastric dilatation-volvulus (GDV) and congestive heart failure the most gratifying to treat.
  • Clinical Rotation, Colorado State University, Fort Collins
  • Doctor of Veterinary Medicine, Ross University, St Kitts & Nevis, West Indies
  • Bachelor of Science, Animal Science, Texas A&M University, College Station
Dr. Aghamalian comes from a family of five with two sisters. She loves reading, gardening and playing card/board games.
Dr. Anna Bierwiaczonek is an emergency medicine veterinarian. She is kneeling next to a white dog and a brown dog.
Anna Bierwiaczonek
DVM
Emergency Medicine
Anna Bierwiaczonek
DVM
BluePearl Veterinarian
Emergency Medicine
Servicing Locations
Dr. Anna Bierwiaczonek enjoys all aspects of emergency medicine, especially soft tissue surgery, wound care and treating traumatic injuries.
  • Internship, Surgery, Dallas Veterinary Surgical Center, Fort Worth TX
  • Internship Surgery, VCA Veterinary Referral & Emergency Center, Norwalk CT
  • Internship, Small Animal Medicine & Surgery, Hickory Veterinary Hospital, Plymouth Meeting PA
  • Clinical Rotation, Texas A&M University, College Station
  • Doctor of Veterinary Medicine, Ross University, St. Kitts & Nevis, West Indies
  • Bachelor of Science, Biology, Pace University, New York City
Dr. Bierwiaczonek likes to cook, bake and travel.
Dr. Erin Black is an emergency medicine veterinarian.
Erin Black
DVM
Emergency Medicine
Erin Black
DVM
BluePearl Veterinarian
Emergency Medicine
Servicing Locations
Dr. Erin Black enjoys stabilizing patients in hypovolemic shock and diagnosing and performing initial treatment for immune-mediated anemia and thrombocytopenia. She is also interested in soft tissue surgical emergencies, including splenectomy, dystocia, gastric dilatation volvulus (GDV) and gastrointestinal (GI) foreign bodies.
  • Doctor of Veterinary Medicine, Texas A&M University, College Station
  • Bachelor of Science, Biomedical Science, Texas A&M University, College Station
Outside of work, Dr. Black likes teaching all forms of Pilates, cycling medium distances, cooking flavorful, health-conscious foods and spending time outdoors with her family. She has a laid-back, quirky Lab/hound mix, Leeloo Dallas.
Dr. Valerie Case is board certified in small animal internal medicine.
Valerie Case
DVM, DACVIM (SAIM)
Internal Medicine
Valerie Case
DVM, DACVIM (SAIM)
BluePearl Veterinarian
Board Certified in Veterinary Small Animal Internal Medicine
Internal Medicine
Servicing Locations
Dr. Valerie Case has learned new techniques, such as tracheal and urethral stenting and pulmonary ultrasound, to best serve her patients. She enjoys working with the cardiology and oncology services to provide comprehensive care.

Her professional interests include feline medicine, cardiology, respiratory disease, diagnostic imaging, and interventional radiology. She enjoys guiding clients toward the best diagnostic and treatment decisions for their pets.
  • Diplomate, American College of Veterinary Internal Medicine (Small Animal Internal Medicine)
  • Residency, Small Animal Internal Medicine, California Animal Hospital, Los Angeles
  • Internship, Small Animal Medicine & Surgery, California Animal Hospital, Los Angeles
  • Doctor of Veterinary Medicine, Oklahoma State University, Stillwater
  • Bachelor of Science, Zoology, University of Oklahoma, Norman
Outside of work, Dr. Case enjoys attending spin and yoga classes, studying wine, trying new restaurants, and watching football with family and friends. She shares her home with her husband and two “very silly felines,” Marshawn and Sarah Thomas.
Dr. Stephanie Chang is an intern in our neurology service.
Stephanie Chang
DVM
Neurology, Neurosurgery
Stephanie Chang
DVM
BluePearl Veterinarian
Neurology, Neurosurgery
Servicing Locations
Dr. Stephanie Chang is an intern in our neurology service. She has interests in clinical research and all aspects of neurosurgery.
  • Internship, Small Animal Medicine & Surgery, Cornell University, Ithaca, NY
  • Doctor of Veterinary Medicine, University of Saskatchewan, Canada
  • Bachelor of Science, Applied Animal Biology, University of British Columbia, Vancouver, Canada
Dr. Chang enjoys cooking, watching horror and mystery shows, catching up with family in Canada and relaxing with her cat, Pekoe.
Dr. Kendall Day is Board Certified in Veterinary Neurology
Kendall Day
DVM, DACVIM (Neurology)
Neurology
Kendall Day
DVM, DACVIM (Neurology)
BluePearl Veterinarian
Board Certified in Veterinary Neurology
Neurology
Servicing Locations
  • Diplomate, American College of Veterinary Internal Medicine (Neurology)
  • Residency, Neurology & Neurosurgery, University of Florida, Gainesville
  • Residency, Neurology & Neurosurgery, Auburn University, AL
  • Internship, Neurology & Neurosurgery, Center for Veterinary Specialty and Emergency Care, Lewisville, TX
  • Internship, Small Animal Medicine & Surgery, BluePearl Specialty + Emergency Pet Hospital, Tampa, FL
  • Doctor of Veterinary Medicine, Auburn University, AL
  • Bachelor of Science, Marine Biology, University of Rhode Island, Kingston
Dr. Day enjoys gardening, knitting, biking and working out. She lives with her boyfriend, dogs Callie and Lexie, and a cat named Sandwich.
Dr. Sonya Hansen is board certified in veterinary emergency & critical care.
Sonya Hansen
DVM, MS, DACVECC
Critical Care
Sonya Hansen
DVM, MS, DACVECC
BluePearl Veterinarian
Board Certified in Veterinary Emergency & Critical Care
Critical Care
Servicing Locations
Dr. Sonya Hansen has a strong interest in educating others through hands-on teaching and lectures. She particularly enjoys treating trauma, acute kidney injuries, and endocrine emergencies, as well as tailoring fluid therapy for her patients’ individual needs.
  • Diplomate, American College of Veterinary Emergency & Critical Care
  • Residency, Emergency & Critical Care, Auburn University, AL
  • Master of Science, Veterinary Biomedical Sciences, Auburn University, AL
  • Internship, Emergency & Critical Care, Auburn University, AL
  • Internship, Small Animal Medicine & Surgery, Michigan State University, East Lansing
  • Doctor of Veterinary Medicine, University of Minnesota, St. Paul
  • Bachelor of Arts, Anthropology, Grinnell College, IA
Outside of work, Dr. Hansen enjoys spending time with her husband, daughter, two dogs, and two cats. She also likes exercising, traveling, and trying new breweries and restaurants.
Dr. Barbara Lindsay is a veterinarian in our neurology and neurosurgery service.
Barbara Lindsay
BVM&S, DACVIM (Neurology)
Neurology, Neurosurgery
Barbara Lindsay
BVM&S, DACVIM (Neurology)
BluePearl Veterinarian
Board Certified in Veterinary Neurology
Neurology, Neurosurgery
Servicing Locations
Dr. Barbara Lindsay has a strong interest in training the next generation of veterinarians. She works closely with other specialty clinicians and referring veterinarians to provide comprehensive treatment plans for her patients. Her special interests include neuro-oncology cases and meningitis treatment.
  • Diplomate, American College of Veterinary Internal Medicine (Neurology)
  • Residency, Neurology & Neurosurgery, Center for Veterinary Specialty and Emergency Care, Lewisville, TX
  • Internship, Neurology, Center for Veterinary Specialty and Emergency Care, Lewisville, TX
  • Internship, Neurology, VCA Animal Specialty Center, Yonkers, NY
  • Internship, Small Animal Surgery, Animal Referral Hospital, Sydney, Australia
  • Internship, Small Animal Medicine & Surgery, Veterinary Specialist Services, Brisbane, Australia
  • Bachelor of Veterinary Medicine & Surgery, Murdoch University, Perth, Australia
  • Bachelor of Science, Veterinary Biology, Murdoch University, Perth, Australia
Dr. Lindsay enjoys running, practicing barre Pilates, drinking espresso and spending time with her cat. She grew up on a sheep farm in Australia, and while she misses her sheep dogs, she loves exploring the “Lone Star State” and meeting local people.
Dr. Maggie Mezzles is Board Certified in Veterinary Surgery-Small Animal
Marguerite Mezzles
DVM, DACVS-SA
Surgery
Marguerite Mezzles
DVM, DACVS-SA
BluePearl Veterinarian
Board Certified in Veterinary Surgery-Small Animal
Surgery
Servicing Locations
Dr. Maggie Mezzles has a strong interest in soft tissue surgery, wound management and surgical oncology.
  • Diplomate, American College of Veterinary Surgeons-Small Animal
  • Residency, Small Animal Surgery, Summit Veterinary Referral Center, Tacoma, WA
  • Internship, Small Animal Surgery, Las Vegas Veterinary Specialty Center, NV
  • Internship, Small Animal Surgery, Animal Specialty and Emergency Center, Los Angeles, CA
  • Internship, Small Animal Medicine & Surgery, Oklahoma State University, Stillwater
  • Clinical Rotation, Texas A&M University, College Station
  • Doctor of Veterinary Medicine, Ross University, St. Kitts & Nevis, West Indies
  • Bachelor of Science, Animal Science, Texas A&M University, College Station
Outside of work, Dr. Mezzles enjoys music, painting, quilting, traveling, reading, theater and anything relating to sports or water. She and her husband have two cats.
Dr. Breanne Morell is a small animal medicine and surgery intern.
Breanne Morrell
MS, DVM
Breanne Morrell
MS, DVM
BluePearl Veterinarian
Servicing Locations
Dr. Breanne Morrell is a small animal medicine & surgery intern. She is interested in small animal neurology.
  • Doctor of Veterinary Medicine, Oklahoma State University, Stillwater
  • Master of Science, Oklahoma State University, Stillwater
  • Bachelor of Science, Animal Science, Oklahoma State University, Stillwater
Dr. Morrell enjoys playing video games and watching movies. She has two cats named BooBoo and Wafer.
Dr. Teresa Seyfert is board certified in veterinary internal medicine.
Teresa Seyfert
DVM, DACVIM (SAIM)
Internal Medicine
Teresa Seyfert
DVM, DACVIM (SAIM)
BluePearl Veterinarian
Board Certified in Small Animal Internal Medicine
Internal Medicine
Servicing Locations
Dr. Teresa Seyfert has extensive experience performing abdominal ultrasound tests, and she continues to advance her training in ultrasound technique and sampling. She has also completed additional training in laparoscopic liver biopsy, tracheal stenting, and echocardiogram.

Her professional interests include gastrointestinal (GI) disorders, hematologic and autoimmune disease, and endocrine disease.
  • Diplomate, American College of Veterinary Internal Medicine (Small Animal Internal Medicine)
  • Residency, Small Animal Internal Medicine, Oklahoma State University, Stillwater
  • Internship, Small Animal Internal Medicine, Oklahoma State University, Stillwater
  • Internship, Small Animal Medicine & Surgery, The Ohio State University, Columbus
  • Doctor of Veterinary Medicine, Kansas State University, Manhattan
  • Bachelor of Science, Animal Science & Industry, Kansas State University, Manhattan
Outside of work, Dr. Seyfert enjoys watching movies, walking, attending college football games, and visiting amusement parks with her husband and two daughters. She has two dogs and a hamster.
Dr. Benjamin Williams is a neurology veterinarian at BluePearl Pet Hospital.
Benjamin Williams
DVM, MS, DACVIM (Neurology)
Neurology, Neurosurgery
Benjamin Williams
DVM, MS, DACVIM (Neurology)
BluePearl Veterinarian
Board Certified in Veterinary Neurology
Neurology, Neurosurgery
Servicing Locations
Dr. Benjamin Williams has a strong interest in teaching veterinary interns and residents and is actively involved in training neurology/neurosurgery residents. He has consulted with several zoos and exotic feline sanctuaries on neurologic cases and is interested in the wide variety of MRI findings for intracranial diseases. He most enjoys neurosurgical cases and finds intervertebral disc herniations and spinal fractures particularly rewarding to treat.
  • Diplomate, American College of Veterinary Internal Medicine (Neurology)
  • Residency, Neurology & Neurosurgery, Center for Veterinary Specialty and Emergency Care, Dallas, TX
  • Internship, Neurology & Neurosurgery, Center for Veterinary Specialty and Emergency Care, Dallas, TX
  • Internship, Small Animal Medicine & Surgery, Angell Animal Medical Center, Boston, MA
  • Master of Science, Biomedical Sciences, Colorado State University, Fort Collins
  • Doctor of Veterinary Medicine, Western University of Health Sciences, Pomona, CA
  • Bachelor of Arts, Legal Studies, University of Massachusetts, Amherst
Outside of the hospital, Dr. Williams enjoys reading, hiking, going out to eat or to the movies, and watching most sports (soccer and football in particular). He grew up with Gordon and Irish Setters but currently shares a townhouse with one adopted cat.
Dr. Chiahsin Young is a board certified in veterinary emergency & critical care veterinarian at BluePearl Pet Hospital.
Chia-Hsin Sandy Young
DVM, DACVECC
Critical Care
Chia-Hsin Sandy Young
DVM, DACVECC
BluePearl Veterinarian
Board Certified in Veterinary Emergency & Critical Care
Critical Care
Servicing Locations
Dr. Chia-Hsin Sandy Young’s special interests include endocrine emergencies, sepsis cases and respiratory emergencies. She finds chest tube placements, urethral deobstructions and esophagostomies particularly gratifying to perform.
  • Diplomate, American College of Veterinary Emergency & Critical Care
  • Residency, Emergency & Critical Care, University of Minnesota, St. Paul
  • Internship, Small Animal Medicine & Surgery, Veterinary Emergency Clinic and Referral Centre, Toronto, Ontario, Canada
  • Doctor of Veterinary Medicine, Colorado State University, Fort Collins
  • Bachelor of Science, Biochemistry, North Carolina State University, Raleigh
Dr. Young lives with her husband and their three cats. In her free time, she enjoys gardening, ballet and video games.