Internal Medicine
What we do
The Internal Medicine Service at New Bolton Center is comprised of internationally recognized specialists within their field. Large Animal Internal Medicine is a specialized area of veterinary care that encompasses expertise across numerous medical disciplines, including neurology, oncology, endocrinology, pulmonology, and neonatology, among others. Our internal medicine specialists bring advanced experience in diagnosing and managing complex and uncommon cases. Our faculty and residents also actively engage in clinical research, continually enhancing our understanding and improving the health and care of our patients.
Our Services
Disorders and Treatment
Pituitary Pars Intermedia Dysfunction (Equine Cushing’s Disease) and Equine Metabolic Syndrome are two very common endocrine disorders of horses. These disorders can lead to serious complications, most notably laminitis. Our internal medicine specialists possess expertise in the management of endocrine disorders and laminitis. Dr. Van Eps provides weekly in-person consultation service, focused on advanced diagnostics for problem equine endocrine cases.
To learn more about endocrine disorders in horses, watch Dr. Van Eps’ First Tuesday Lecture “Overcoming Laminitis through Better Insulin Control.”
New Bolton Center offers the latest in diagnostic options for gastrointestinal disorders, including gastroscopy, ultrasound, biopsy, and intestinal absorption studies.
Liver disease in horses can be serious, but early diagnosis and expert care make a big difference. Our team specializes in identifying and treating liver conditions, offering advanced testing and personalized treatment plans. Dr. Tomlinson is world-renowned for her expertise in equine liver viruses and liver diseases.
New Bolton Center’s Neonatal Intensive Care Unit is world-renowned for its management of critically ill neonates, as well as management of high risk pregnancies. Dr. Abraham leads our NICU team each year, bringing over 2 decades of neonate experience.
We are one of the few veterinary hospitals in the US with a dedicated large animal neurologist. One of five double-boarded large animal neurologists in the country, Dr. Johnson is world-renowned for her expertise in neurologic disease, including neurodegenerative conditions (eNAD/EDM), neck problems, EPM, and Lyme neuroborreliosis.
Our internal medicine team possesses expertise in the diagnosis and management of a wide range of tumors in large animals, offering compassionate, cutting-edge care every step of the way. Dr. Luethy has a particular interest in oncology and the diagnosis and treatment of lymphoma.
Urinary and kidney disease can be life-threatening. Our specialists are experienced in diagnosing and managing these disorders, through advanced diagnostics including ultrasound, biopsy, and cystoscopy.
Our specialists diagnose and treat respiratory disorders such as equine asthma and pneumonia. Dr. Nolen-Walston has decades of experience in the management of equine respiratory diseases, with a particular interest in equine asthma.
To learn more about respiratory disorders in horses, watch Dr. Luethy’s First Tuesday Lecture “Decoding the Coughing Horse.”
Board-certified dermatologists are available by appointment (typically once-monthly) to consult on animals with skin problems.
Our Care Team
Section Chief, Internal Medicine & Ophthalmology
Amy L. Johnson, DVM, DACVIM (LAIM & Neurology)
Professor of Medicine and Neurology; Marilyn M. Simpson Professor of Equine Medicine (CE)
Clinicians
Raymond W. Sweeney, VMD, DACVIM
Residents and Staff
Jessica Cathcart, DVM
Resident, Internal Medicine
Lawton (Leci) Irvin, DVM
Resident, Internal Medicine
Virginia Logue, DVM
Resident, Internal Medicine
Flavie Payette, DVM
Resident, Internal Medicine
Kavita Shroff, VMD
Resident, Internal Medicine
Kali Slavik, DVM
Resident, Internal Medicine
Hannah Taylor, VMD
Resident, Internal Medicine
Sarah Colmer, VMD, DACVIM
Neurology Fellow
