Midtown, NY (212) 767-0099

410 West 55th Street

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John Farrelly, DVM, MS, DACVIM-Oncology, DACVR-RO

Oncology, Oncology Radiation

Specialist, Board Certified in Veterinary Oncology, Board Certified in Oncology Radiation

On The Job

As a child, Dr. John Farrelly traveled to Ireland every year to visit family, and he loved working with the animals. He also loved science, so he decided to pair the two and study veterinary medicine. He chose the oncology and radiation oncology specialties because there are very few people in these fields. It’s important to him to offer specialized care for pets with cancer, and he finds it rewarding. While others might find treating cancer patients to be depressing, he considers it fulfilling to give pets a great quality of life for months to years after their cancer diagnosis.

Dr. Farrelly has stayed active in his field as a professional journal editor and manuscript reviewer. He has chaired therapy groups, reviewed certification exams, instructed at Cornell University and, as a consultant, provided biostatistics services for veterinarians.

Although there are a number of tumors that are challenging to treat, Dr. Farrelly finds nasal tumors in dogs and cats fascinating because they are surrounded by critical structures such as the eyes or the brain. In the past, treatment of these tumors often came with devastating side effects, but he has been able to watch and work with advances in technology, allowing for more rewarding treatment of these patients.


Diplomate, American College of Veterinary Radiology, Radiation Oncology
Diplomate, American College of Veterinary Internal Medicine, Oncology
Residency, Radiation Oncology, Cornell University, Ithaca NY
Residency, Medical Oncology, Animal Medical Center, NYC
Internship, Small Animal Medicine & Surgery, Animal Medical Center, NYC
Master of Science, Biostatistics, New York Medical College, Valhalla NY
Doctor of Veterinary Medicine, Cornell University, Ithaca NY
Bachelor of Arts, Classical Civilization, New York University, NYC

Off Duty

Married to his high school sweetheart, Dr. Farrelly and his wife have four children. The family enjoys sports, like skiing and snowboarding, and music. When time allows, Dr. Farrelly even plays the bagpipes. The four-legged members of the family include Kissy Murphy and Cavan Mulligan, two fun-loving mutts.

Select Articles and Publications

Smith J, Kiupel M, Farrelly J, Cohen R, Olmsted G, Kirpensteijn J, Post G. Recurrence rates and clinical outcome for dogs with grade II mast cell tumours with a low AgNOR count and Ki67 index treated with surgery alone. Vet Comp Oncol. 2015 Feb 3. Epub.

Farrelly J, McEntee MC. A survey of veterinary radiation facilities in 2010. Vet Radiol Ultrasound. 2014; 55(6): 638-43.

Keyerleber MA, McEntee MC, Farrelly J, Thompson MS, Scrivani PV, Dewey CW. Three-dimensional conformal radiation therapy alone or in combination with surgery for treatment of canine intracranial meningiomas. Vet Comp Oncol. 2015 Dec; 13(4):385-97. Epub 2013.

Chalhoub S, Langston CE, Farrelly J. The use of darbepoetin to stimulate erythrogenesis in anemia of chronic kidney disease in cats: 25 cases. J Vet Intern Med. 2012; 26(2):363-9.

Keyerleber MA, McEntee MC, Farrelly J, Podgorsak M. Completeness of reporting of radiation therapy planning, dose and delivery in veterinary radiation oncology manuscripts from 2005 to 2010. Vet Radio Ultrasound. 2012;53(2): 221-30.