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Orla Mahony - MVB, DACVIM

Dr. Orla Mahony is a small animal internist with a special interest in endocrinology. She teaches students in their senior year during their small animal medicine rotations, and is board certified by both the American and European Colleges of Veterinary Internal Medicine.

Growing up in Ireland as the daughter of a beef cattle rancher, Dr.Mahony says she always wanted to be a veterinarian. After attending University College in Dublin for veterinary training and an internship, Dr. Mahony moved to England to work in small animal practice. She wanted to specialize further and was accepted into a residency program at Tufts, where she has worked since 1994.

Since then, several cases stand out. Scoping an anaconda was an experience I will never forget! she says. More recently, she managed the clinical care for a dog with myasthenia gravis and a thymoma. The dog required a team of doctors, residents, students and technicians from surgery, oncology, anesthesia, neurology and intensive care to remove her thymic tumor and get her through a challenging post-operative recovery. Dr. Mahony adds that, further phenomenal care at home has allowed her to feel like her old self.

I love solving tough cases, and I love teaching. To have a job that allows me to work with people who love animals is a privilege, she says. In her free time, she enjoys volunteering at her daughter's school.


  • MVB - University College Dublin, Ireland - 1987

Board Certification


Coat color change in a cat with diabetes mellitus and adrenocortical carcinoma.

Mui M, Mahony O, Ferrer L.
Clinician’s Brief. 11/2017:14-19.

Adrenal function in cats with cholestatic liver disease. Journal of Veterinary Diagnostic Investigation.

Buckley, F.I., Mahony, O.
C.R.L. 2017.

Mammary development, hyperestrogenemia, and hypocortisolemia in a male cat with an adrenal cortical carcinoma.

Nadolski AC, Markovich JE, Jennings SH, Mahony OM.
Publication year: 2015
Can Vet J. 2016 Oct;57(10):1077-1080.

J Vet Emerg Crit Care (San Antonio).

2015 Mar-Apr;25(2):234-9. doi: 10.1111/vec.12269. Epub 2014 Dec 24. A pilot study comparing a protocol using intermittent administration of glargine and regular insulin to a continuous rate infusion of regular insulin in cats with naturally occurring diabetic ketoacidosis.
Publication year: 2015
Gallagher BR1, Mahony OM, Rozanski EA, Buob S, Freeman LM.

Clinical Findings, diagnostics and outcome in 33 cats with adrenal neoplasia

Author(s):Daniel, G. | Mahony O.W. | Markovich, J.E. | Appleman, E. | Monaghan, K.N. | Lawrence, W.A.| Barton, B.
Publication year: 2015
Journal / Book title: Journal of Feline Medicine and Surgery

Hypoadrenocorticism in a kindred of Pomeranian dogs

Author(s):Mooney, E.T. | Hammond, T.N. | Mahony, O.M.
Publication year: 2015
Journal / Book title: Canadian Veterinary Journal

Effects of diet on glucose control in cats with diabetes mellitus treated with twice daily insulin glargine

Author(s):Hall, T.D. | Mahony, O. | Rozanski, E.A. | Freeman, L.M.
Publication year: 2009
Journal / Book title: Journal of Feline Medicine and Surgery

Brain abscess and bacterial endocarditis in a Kerry Blue Terrier with a history of immune-mediated thrombocytopenia: Case Report

Author(s):Bach, J.F. | Mahony, O.M. | Tidwell, A.S. | Rush, J.E.
Publication year: 2007
Journal / Book title: Journal of Veterinary Emergency and Critical Care

Relationship of pancreatic duct dilation to age and clinical findings in cats

Author(s):Hecht, S. | Penninck, D.G. | Mahony, O.M. | King, R. | Rand, W.M.
Publication year: 2006
Journal / Book title: Veterinary Radiology and Ultrasound

Use of glargine and Lente insulins in cats with diabetes mellitus

Author(s):Weaver, K.E. | Rozanski, E.A. | Mahony, O.M. | Chan, D.L. | Freeman, L.M.
Publication year: 2006
Journal / Book title: Journal of Veterinary Internal Medicine

Hypoparathyroidism: Pathophysiology and diagnosis

Author(s):Henderson, A.K. | Mahony, O.
Publication year: 2005
Journal / Book title: Compendium on Continuing Education for the Practicing Veterinarian

Hypoparathyroidism: Treatment

Author(s):Henderson, A.K. | Mahony, O.
Publication year: 2005
Journal / Book title: Compendium on Continuing Education for the Practicing Veterinarian

Effect of dietary soy on serum thyroid hormone concentrations in healthy adult cats

Author(s):White, H.L. | Freeman, L.M. | Mahony, O. | Graham, P.A. | Hao, Q. | Court, M.H.
Publication year: 2004
Journal / Book title: American Journal of Veterinary Research

Bronchoscopy in small animal medicine: indications, instrumentation, and techniques.

Author(s):Rha, J.Y. | Mahony, O.
Publication year: 1999
Journal / Book title: Clinical techniques in small animal practice

Laryngeal paralysis-polyneuropathy complex in young Rottweilers.

Author(s):Mahony, O.M. | Knowles, K.E. | Braund, K.G. | Averill Jr., D.R. | Frimberger, A.E.
Publication year: 1998
Journal / Book title: Journal of veterinary internal medicine / American College of Veterinary Internal Medicine

Alimentary lymphoma in cats: 28 cases (1988-1993).

Author(s):Mahony, O.M. | Moore, A.S. | Cotter, S.M. | Engler, S.J. | Brown, D. | Penninck, D.G.
Publication year: 1995
Journal / Book title: Journal of the American Veterinary Medical Association

General Research Interests

  • Endocrinology

Selected Research Projects

  • The effect of isoflavones on thyroid function of normal cats.
  • Ultrasonographic appearance of the pancreas in older cats.

Research Interests by Area

Spontaneous Animal Disease Models
  • Canine hypothyroidism, feline hyperthyroidism, Cushing's, Addison's, diabetes mellitus

Research Interests by Organ System and Disease

  • Canine hypoadrenocorticism, hyperadrenocorticism, and diabetes mellitus. Feline insulin resistance and diabetes mellitus.