Cummings School of Veterinary Medicine at Tufts University
Theresa E. O'Toole

Emergency and Critical Care

A board-certified specialist in small animal internal medicine, Dr. O'Toole is one of the core faculty of the Foster Hospital for Small Animals' busy Emergency and Critical Care service. She sees cases that require emergent care for trauma, infections, or complications of a wide assortment of conditions, including metabolic, cardiac and neurological diseases—some of the hospital's most complicated cases.

A native of Manhattan, Dr. O'Toole wanted to be a veterinarian as long as she can remember, which led her to study veterinary medicine here at Tufts, where she graduated in 1995. She teaches third-year veterinary students about shock, its effects and treatments in the Small Animal Medicine and Surgery course, and mentors fourth-year students, interns, and residents in their fourth-year clinical rotations through the emergency and intensive care units.

The Emergency and Critical Care Service is one of the best veterinary resources worldwide, Dr. O'Toole says.The students are excellent, as is the support staff.


  • DVM - Tufts University School of Veterinary Medicine - 1995

Board Certification

  • Internal Medicine (ACVIM) and Emergency and Critical Care (ACVECC)
  1. Fenty RK, deLaforcade AM, Shaw SP, O’Toole TE. Identification of hypercoagulability in dogs with primary immune-mediated hemolytic anemia by means of thromboelastography. J Am Vet Med Assoc 2011;238:463-467.
  2. Whelan MF, O’Toole TE, Chan DL, et al. Use of human mmunoglobulin in addition to glucocorticoids for the initial treatment of dogs with immune-mediated hemolytic anemia. J Vet Emerg Crit Car 2009;19:158–164.
  3. Rogers CL, O'Toole TE, Keating DG, and Webster CRL. Portal Vein Thrombosis in Cats: 6 Cases (2001-2006) J Vet Int Med 2008;22:2; 282-287.
  4. Abelson AL, Shelton DG, Whelan MF, Shaw S,F and O'Toole TE. Use of mycophenolate mofetil as a rescue agent in treatment of generalized myasthenia gravis in three dogs, J Vet Emerg and Crit Care, 2009;19:4;369-374.

General Research Interests

  • Hematology
  • Trauma and Shock
  • Immune Mediated Hemolytic Anemia
  • Coagulopathy

Selected Research Projects

  • Prognostic Risk Factors for Dogs with Immune Mediated Hemolytic Anemia
  • Coagulation Changes in Dogs with Severe Trauma
  • Traumatic Brain Injury
  • Outcome in Dogs with Portal Vein Thrombosis
  • Outcome for Animals with Myasthenia Gravis Undergoing Removal of Thymoma
  • Outcome in Dogs with Aortic Thromboembolism

Research Interests by Area

Spontaneous Animal Disease Models
  • Coagulopathies associated with sepsis, liver disease, renal disease, rodenticide, DIC, and trauma. Immune-mediated hemolytic anemia and thrombocytopenia

Research Interests by Organ System and Disease

Emergency and Critical Care
  • Immune-mediated hemolytic anemia, coagulation, wound healing, clinical critical care.