Our Veterinarians

Dr. Jennifer Clegg is an emergency medicine veterinarian. She is holding a small dog in her arms.
Jennifer Clegg
DVM
Emergency Medicine
Jennifer Clegg
DVM
Emergency Medicine
Servicing Locations
Dr Jennifer Clegg enjoys all aspects of emergency medicine.
  • Internship, Small Animal Medicine & Surgery, Center for Specialized Veterinary Care, Westbury NY
  • Doctor of Veterinary Medicine, Texas A&M University, College Station
Dr. Clegg enjoys playing the piano, quilting and camping. She can also be found spending time with family, friends and her dogs and cats.
Dr. John Dahlinger is board certified in veterinary surgery.
John Dahlinger
DVM, DACVS
Surgery
John Dahlinger
DVM, DACVS
Board Certified in Veterinary Surgery
Surgery
Servicing Locations
Dr. John Dahlinger, “Dr. D” as he is called in the hospital, appreciates that as a small animal surgeon, he has a wonderful opportunity to improve the overall well-being of pets as well as their families.
  • Diplomate, American College of Veterinary Surgeons
  • Residency, Small Animal Surgery, University of California, Davis Internship, Small Animal Medicine & Surgery, University of Georgia, Athens
  • Doctor of Veterinary Medicine, University of California, Davis
Dr. Dahlinger enjoys time with his wife and their two sons. They enjoy camping adventures with their border collie, Rosie.
Dr. William Liska is board certified in veterinary surgery.
William Liska
DVM, DACVS
Surgery
William Liska
DVM, DACVS
Board Certified in Veterinary Surgery
Surgery
Servicing Locations
Dr. William Liska has played a significant role in the development of the canine total knee replacement, the micro total hip replacement (THR) for small dogs and for cats and a newly upgraded design of hip replacement implants for larger dogs. Having performed more than 2,000 joint replacement procedures, he has been the leader in numbers of received THR referrals and procedures performed in the state of Texas for many years. He is certified by the instrumentation and implant manufacturer, BioMedtrix LLC, Boonton, NJ, in all hip, knee and elbow replacement procedures currently available.

The founder of Global Veterinary Specialists and the Global Veterinary Specialists Foundation, Dr. Liska now dedicates his career to these organizations. The educational and surgical services offered focus primarily on joint replacement surgery and orthopedics for dogs and cats. He has been an instructor in more than 40 joint replacement workshops, training other veterinary surgeons in the U.S. and many other countries. Dr. Liska was the recipient of the 1999 Practitioner of the Year and the 2009 Specialty Practitioner of the Year Awards from the Texas Veterinary Medical Association. Additionally, he was awarded the American Veterinary Medical Association Practitioner Research Award in 2009 for his canine and feline hip and knee replacement studies.

Dr. Liska also serves as a hip replacement surgeon and consultant with Sarah Israel, DVM, DACVS, at BluePearl - Stone Oak in San Antonio.
  • Diplomate, American College of Veterinary Surgeons
  • Residency, Surgery, Animal Medical Center, New York City
  • Internship, Surgery, Animal Medical Center, New York City
  • Doctor of Veterinary Medicine, Iowa State University, Ames
Total Hip Replacements" class="staff__link" target=""> Publications & Articles
Dr. Jill Manion is a veterinarian in our internal medicine service. She is holding a cat in her arms.
Jill Manion
MS, DVM
Internal Medicine
Jill Manion
MS, DVM
Internal Medicine
Servicing Locations
Dr. Jill Manion's special areas of interest include renal disease, especially acute renal failure, respiratory diseases, and cases requiring critical care and intensive management.
  • Residency, Small Animal Internal Medicine, Mississippi State University, Starkville
  • Internship, Small Animal Medicine & Surgery, Kansas State University, Manhattan
  • Doctor of Veterinary Medicine, Mississippi State University, Starkville Master of Science, Mississippi State University, Starkville
  • Bachelor of Science, Zoology and Life Sciences, The Ohio State University, Columbus
Dr. Manion enjoys time with her family and their three dogs and one cat. Her favorite activities include cooking/baking, swimming, and traveling.
Photo coming soon.
Erin Rogers
DVM
Emergency Medicine
Erin Rogers
DVM
Emergency Medicine
Servicing Locations
Dr. Erin Rogers is excited about the variety of cases she sees in emergency medicine and especially likes treating geriatric patients.
  • Doctor of Veterinary Medicine, Texas A&M University, College Station
  • Bachelor of Science, Biology, University of the Incarnate Word, San Antonio TX
Dr. Rogers stays busy running, reading and taking care of her three children and many pets. Her menagerie includes two miniature poodles, Maverick and Oscar; a great Dane, Arya; three cats, Julio, Christoph, and Elsa; a ferret named Lola; and a guinea pig named Max.
Photo coming soon.
Obaid Ullah
DVM, MPH
Emergency Medicine
Obaid Ullah
DVM, MPH
Emergency Medicine
Servicing Locations
Dr. Obaid Ullah has a particular interest in cardiovascular and renal disease.
  • Internship, Small Animal Medicine & Surgery, Atlantic Coast Veterinary Specialists, Bohemia NY
  • Master of Philosophy, Molecular Biology, University of the Punjab, Lahore, Pakistan
  • Doctor of Veterinary Medicine, University of Agriculture, Faisalabad, Pakistan
Dr. Ullah loves spending time with his wife, who has a PhD in molecular biology, and his son and daughter. The family enjoys traveling both within the United States and abroad.
Dr. Jack Ying is an emergency medicine veterinarian. He is holding a cat in his arms.
Jack Ying
DVM
Emergency Medicine
Jack Ying
DVM
Emergency Medicine
Servicing Locations
Dr. Jack Ying loves the challenge and rewards of emergency medicine, especially surgical procedures like GDVs, intestinal blockages, urinary blockages and wound repair.
  • Internship, Small Animal Medicine & Surgery, University of Missouri, Columbia
  • Doctor of Veterinary Medicine, University of Missouri, Columbia
Dr. Ying, his wife and son enjoy watching movies, cooking and eating, swimming and going to the beach. They have four pets: rescued bloodhound mix Cooper, yorkie mix Ainsley, husky/retriever mix Bailey, and cat Bubba.