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Our Veterinarians

Photo coming soon.
Rhonda Aper
MS, DVM, DACVS-SA
Surgery
Rhonda Aper
MS, DVM, DACVS-SA
Board Certified in Veterinary Surgery-Small Animal
Surgery
Servicing Locations
  • Diplomate, American College Veterinary Surgeons-Small Animal
  • Residency, Surgery, The Ohio State University, Columbus
  • Doctor of Veterinary Medicine, Iowa State University, Ames
  • Master of Science, Biomedical Engineering, University of Iowa, Iowa City
  • Bachelor of Science, Mechanical Engineering, Michigan Tech University
Photo coming soon.
Christine Graham
MS, DVM, DACVD
Dermatology
Christine Graham
MS, DVM, DACVD
Board Certified in Veterinary Dermatology
Dermatology
Servicing Locations
  • Diplomate, American College of Veterinary Dermatology
  • Residency, Dermatology, Michigan State University, East Lansing
  • Internship, Dermatology, University of Columbia, Columbia MO
  • Doctor of Veterinary Medicine, Iowa State University, College of Veterinary Medicine, Ames
  • Master of Science, Human Animal Bond and Grief Counseling, Iowa State University, Ames
Dr. Janelle Karau is an emergency medicine veterinarian.
Janelle Karau
DVM
Emergency Medicine
Janelle Karau
DVM
Emergency Medicine
Servicing Locations
Dr. Janelle Karau loves emergency medicine because every day is different. She welcomes the opportunity to continuously enhance her knowledge and skills, which ultimately allows her to offer the very best medical and surgical care to her patients.
  • Doctor of Veterinary Medicine, Iowa State University, Ames
  • Bachelor of Science, Biology, South Dakota State University, Brookings
Dr. Karau enjoys spending family time with her husband, son, dog and three cats. Her hobbies include cooking and baking, gardening and yoga.
Dr. Matt Keller is an emergency medicine veterinarian. He is holding an orange cat.
Matt Keller
DVM
Emergency Medicine
Matt Keller
DVM
Emergency Medicine
Servicing Locations
Dr. Matt Keller is interested in both surgery and research. He finds emergency medicine gratifying, especially trauma surgery and wound management.
  • Internship, Small Animal Surgery, Southwest Veterinary Surgical Service, Phoenix AZ
  • Doctor of Veterinary Medicine, Iowa State University, Ames
  • Bachelor of Arts, Biology, Chemistry, University of Northern Iowa, Cedar Falls
In his free time, Dr. Keller enjoys outdoor pursuits.
Dr. Erin McCormick is a veterinarian in our emergency and critical care service.
Erin McCormick
DVM
Emergency Medicine
Erin McCormick
DVM
Emergency Medicine
Servicing Locations
Dr. Erin McCormick enjoys all aspects of small animal medicine. She particularly likes the variety of cases that are seen in an emergency practice, and is proud to part of a motivated, compassionate team.
  • Internship, Small Animal Medicine & Surgery, VCA Aurora Animal Hospital and VCA Berwyn Animal Hospital, Aurora and Berwyn, IL
  • Doctor of Veterinary Medicine, University of Minnesota, St Paul
  • Bachelor of Science, Biology, Mount Mercy College, Cedar Rapids IA
A fan of the outdoors, Dr. McCormick likes biking, hiking, cross-country skiing and gardening. She also enjoys cooking and various house projects. She and her husband have a Red Heeler mix named Denali and a pit bull named Max, as well as occasional foster cats.
Photo coming soon.
Teresa Obr
DVM, DACVIM
Internal Medicine
Teresa Obr
DVM, DACVIM
Board Certified in Veterinary Internal Medicine
Internal Medicine
Servicing Locations
  • Diplomate, American College of Veterinary Internal Medicine
  • Residency, Internal Medicine, Gulf Coast Veterinary Specialists, Houston TX
  • Internship, Internal Medicine, Gulf Coast Veterinary Specialists, Houston TX
  • Internship, Small Animal Medicine & Surgery, Animal Hospital Specialty Center
  • Doctor of Veterinary Medicine, Iowa State University, Ames
  • Bachelor of Science, Biology, University of Iowa, Iowa City
Dr. Leo Roa is a veterinarian in our emergency and critical care service. He is holding a black and white dog.
Leo B. Roa Guzman
MVD
Critical Care
Leo B. Roa Guzman
MVD
Critical Care
Servicing Locations
Dr. Leo Roa Guzman has been practicing emergency medicine since 2007 and finds the field particularly gratifying, especially the technological advancements that have allowed for better patient care. His clinical interests include trauma cases, mechanical ventilation and transfusion medicine.
  • Residency, Emergency & Critical Care, Eastern Iowa Veterinary Specialty Center, Cedar Rapids
  • Doctor of Veterinary Medicine, Universidad Nacional Pedro Henriquez Urena, Santo Domingo, Dominican Republic
Dr. Roa Guzman spends most of his free time with his family and pets. He also enjoys travelling and finding places to go hiking and biking.
Dr. Amie Roberts is an emergency medicine veterinarian.
Amie Roberts
DVM
Emergency Medicine
Amie Roberts
DVM
Emergency Medicine
Servicing Locations
Dr. Amie Roberts started her emergency medicine career as a receptionist at an e-clinic, continuing as a veterinary assistant throughout her education. She has over a decade of emergency experience.
  • Doctor of Veterinary Medicine, Iowa State University, Ames
  • Bachelor of Science, Biology and International Studies, Iowa State University, Ames
Dr. Roberts and her family enjoy traveling, hiking and biking in Iowa's famous RAGBRAI. Outside of her work at the hospital, she holds an active position in the state Veterinary Medicine Association.
Photo coming soon.
Melissa Shamrock
DVM
Emergency Medicine
Melissa Shamrock
DVM
Emergency Medicine
Servicing Locations
  • Doctor of Veterinary Medicine, University of Florida, Gainesville
Dr. Tyler Zylstra is an emergency medicine veterinarian. He is sitting on a cliff with a brown and white dog.
Tyler Zylstra
DVM
Emergency Medicine
Tyler Zylstra
DVM
Emergency Medicine
Servicing Locations
Dr. Tyler Zylstra has a strong interest in research. While in in school, he researched kinematics of spinal cord injuries in sheep for a year. As a clinician, he finds wound repair and surgery particularly gratifying.
  • Doctor of Veterinary Medicine, Iowa State University, Ames
  • Bachelor of Science, Animal Science, Iowa State University, Ames
Dr. Zylstra enjoys spending time outdoors hiking, kayaking and doing yard work. He has two dogs.