Meet our Doctors

Mario A Barenas, DVM

Internal Medicine Intern

Internal Medicine

Originally from Puerto Rico, I fell in love with veterinary medicine and the incredible impact veterinarians make on families early on in life. My interest in Internal Medicine blossomed in my internship at the Schwarzman Animal Medical Center where I found my passion in managing difficult cases and tailoring care and helping underserved minorities seeking veterinary care.
Among the multitude of conditions Internal Medicine manages, it was during my specialty internship at Angell Animal Medical Center that I found my pasion for nephrology, hepatology, and immunology. In addition, I am specially interested in interventional procedures, such as dialysis, interventional endoscopy/laparoscopy and cystoscopy.

I am exited to join a hospital that shares my passion for serving owners and practice evidence-based medicine!


  • University of Illinois at Urbana—Champaign, B.S. Animal Science
  • Cornell University College of Veterinary Medicine, Veterinary Medicine, DVM
  • The Schwarzman Animal Medical Center, Internship Class of 2022
  • Angell Animal Medical Center, IM Specialty Internship 2023

Publications and Research:

  • “Retrospective evaluation of the use and complications of small-bore wire-guided thoracostomy tubes in dogs and cats: 156 cases (2007 – 2019).” Tomas Boullhesen Williams, Daniel
    John Fletcher, Jacqueline Fusco, Allison Bichoupan, Lisa Weikert, Mario Barenas and Julie Menard, Frontiers in Veterinary Science: Veterinary Emergency and Critical Care Medicine.

Friendship provides state of the art, comprehensive services for our clients and patients. But, more than that, we provide a caring team who understand the unique human-animal bond. View Our Services