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Internal Medicine

Link to Veterinarians

The Department of Internal Medicine consists of four board certified internists and a specialized technical support staff.

Diagnostic services include:

  • Ultrasonography
  • Endoscopic examinations of the upper and lower gastrointestinal tract, the urinary tract and the nasal passages
  • Biopsies

Therapeutic services include:

  • Chemotherapy for selected tumors
  • Radioactive iodine treatment for cats with hyperthyroidism
  • Intravenous nutrition for animals too ill to eat
  • Treatments for Cushing’s disease
  • Treatments for Addison’s disease
  • Canine hypothyroidism
  • Diabetic Stabilization

Our internists integrate their care with neurology, oncology, cardiology, surgery, and the critical care unit to function as a team in order to provide the best possible medical and surgical care to all of our patients.


What is leptospirosis?

Leptospirosis is a serious bacterial disease caused by multiple strains (serovars) of the bacteria, which are passed in the urine of multiple species of animals.  It is a known zoonotic disease.  This disease is found worldwide, although strains vary from country to country.  The “carriers” of the bacteria (most commonly rats, raccoons, horses, and cows) vary and are often not sick from the disease.  Unvaccinated dogs are also likely one of the common carriers in our area.  There have been an extraordinary number of dogs afflicted with this bacterial disease in the Northern New Jersey region in the last year, most likely because of our very wet weather pattern.   The bacteria persist in areas of standing water such as ponds – either ornamental or natural ponds, mud puddles, or water collecting on tarps.  It also hides in warm, wet, shaded areas of lawns or forests.


What does a zoonotic disease mean?

Zoonotic diseases are diseases transmitted from animals to humans.  The disease is spread in the urine of the infected animals.  If your pet has been diagnosed with leptospirosis, you should follow your veterinarian’s recommendations about the handling of the pet’s urine.  You should consult your own physician regarding exposure to the disease from your pet.


How does my pet get this disease?

Dogs become infected by leptospires when abraded skin comes in contact with infected urine, water contaminated by infected urine, or moist soil contaminated by infected urine.  Also the organism can gain access to the animal through drinking the urine or contaminated water.


What kind of symptoms occur with leptospirosis and what treatments can be given?

Leptospirosis progresses fairly quickly once animals are exposed to the bacterium.  Symptoms often can be very serious and usually include one or more of the following: increased thirst and urination, decreased appetite, vomiting, diarrhea, and jaundice (yellow coloration to the skin).  These are usually the result of acute kidney and/or liver failure.  This is a very treatable disease.  Although antibiotics are effective at killing the Leptospira bacteria, intensive supportive care is often needed to help preserve organ function and give patients the best possible outcome. Most patients require a 3-5 day hospitalization stay to help them get over the acute phase of the disease.  With early intervention, the majority of disease cases have a good outcome with up to 70-80% of dogs making a full recovery.  However, some cases do not respond to appropriate therapy despite all efforts.


What should I do about leptospirosis and my dog?

It is very important that you keep your dog away from wet areas where the organism is found in the highest numbers.  If you have a lot of shading in your yard, you should consider getting sun to those areas to eliminate moist soil which we know can be permanently contaminated if not dried out.

You should also consider having your dog immunized with a Leptospira vaccine if that has already not been performed.  The currently available vaccines provide effective protection against the most common serovars of Leptospira.   Vaccinations begin as a series of two, and then boosted yearly.

Dr. Deborah Hall publication “Hepatocutaneous Syndrome in Shih Tzus, JAVMA, Vol248, No.7,Pp802-813, April 2, 2016


Doctors in Internal Medicine

Mary Ann Crawford, DVM, DACVIM (Internal Medicine)

Dr. Crawford received her veterinary degree at the Ohio State University College of Veterinary Medicine in 1978. Dr. Crawford is board certified by the American College of Veterinary Internal Medicine. She has been board certified in internal medicine since 1985 and joined the Oradell Animal Hospital staff in 1986. Dr. Crawford was Professor and Head of the Medicine Department at Louisiana State University College of Veterinary Medicine before coming to Oradell Animal Hospital. She is also a past president of the American College of Veterinary Internal Medicine and a past president of the Northern New Jersey Veterinary Medical Association. Dr. Crawford was awarded "Distinguished Alumnus" from The Ohio State University College of Veterinary Medicine in 1995 and in 2004 "Outstanding Alumnus" from the Animal Medical Center in New York City. She is also the recipient of the 1997 Friskies Pet Care Award for Feline Medicine and Nutrition given for outstanding clinical research in the area of feline hepatic lipidosis. Dr. Crawford is involved in a number of clinical research projects and acts as a consultant for Antech Diagnostic Laboratories. In her free time she spends time with her family and enjoys biking and swimming.

Dara Zerrenner, VMD, DACVIM (Internal Medicine)

Dr. Zerrenner received her Veterinary degree from the University of Pennsylvania School of Veterinary Medicine. She completed an internship in small animal medicine and surgery at Oradell Animal Hospital and completed her residency in internal medicine at the Animal Medical Center in New York City. Dr. Zerenner is board certified by the American College of Veterinary Internal Medicine. Her professional interests include endocrinology, gastroenterology and nephrology. She loves spending time with her two children and pets. She enjoys travelling anywhere there is a beach!

Deborah Hall, DVM, DACVIM (Internal Medicine)

Dr. Hall received her DVM degree from the University of Wisconsin-Madison School of Veterinary Medicine. She completed a general internship at Michigan State University College of Veterinary Medicine and completed a residency in internal medicine at Kansas State University College of Veterinary Medicine. Dr. Hall enjoys travel and dance. She has two dogs, Milo and Marcus.

John Lucy, DVM, DACVIM (Internal Medicine)

Dr. Lucy grew up in Ocean County, and developed a fondness for working with animals at an early age. After completing his undergraduate training at Rutgers University, he traveled to upstate NY and received his DVM from Cornell’s world-renowned College of Veterinary Medicine. He completed his rotating internship in medicine and surgery at Oradell Animal Hospital and residency in internal medicine at Cornell. Dr. Lucy's medical interests include endocrinology, hepatology, immune-mediated diseases and minimally invasive diagnostics and therapeutics. Dr. Lucy oversees our Radioiodine Clinic for the treatment of hyperthyroid cats. In his spare time, Dr. Lucy enjoys running, swimming, travel and watching excessive amounts of HGTV. Efficacy of Low-dose (2 milicurie) versus Standard-Dose (4 milicurie) Radioactive Treatment for Cats with Mild to Moderate Hyperthyroidism.