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Dogs & Cats Veterinary Referral now has MRI on-site! Check out the neurology page for more details...
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Staff Bios

Kathy Arrington, DVM, DACVIM (Internal Medicine)

Dr. Kathy Arrington is practice owner and a staff internal medicine specialist, as well as Medical Director at Dogs and Cats Veterinary Referral.

Dr. Arrington received her Doctor of Veterinary Medicine from the University of Tennessee at Knoxville in 1988. Upon graduation, she completed a one-year internship in small animal medicine and surgery at Angel Memorial Animal Hospital in Boston, MA. From 1990 to 1993, she was a resident in small animal medicine at the University of Tennessee at Knoxville, moving onto a role as a clinical instructor the following year. In 1994, she received Board Certification in Internal Medicine by the American College of Veterinary Medicine.

Click here to visit the Internal Medicine Department page.

Dr. Anke Langenbach, med.vet, Diplomate ACVS, Diplomate ECVS, ACVSMR, Practice Owner, CFO

Dr. Anke Langenbach is a Diplomate of the American and European Colleges of Veterinary Surgeons. She earned her Doctorate of Veterinary Medicine in 1992 from the University of Munich, College of Veterinary Medicine in Germany, and was awarded a scholarship to pursue a combined American and German education. She spent most of her third year of veterinary school at Kansas State University and part of her fourth year at Ohio State University, Cornell University, and Animal Medical Center of New York. After receiving her veterinary degree, she continued her studies with a one-year internship followed by a three-year residency program at the University of Pennsylvania, School of Veterinary Medicine. During her residency, she completed a doctoral thesis with the University of Zurich, Switzerland, on Medical Patellar Luxation and Hip Dysplasia in Cats. With her residency finished, she accepted a lectureship position with the University of Pennsylvania.

In 1998, Dr. Langenbach achieved Diplomate status as a board-certified surgeon. Since her time at the university, she has published several articles, authored a book chapter, and has presented at many regional, national, and international meetings. She is currently collaborating with North Carolina State University on clinical studies. Her clinical interests include arthroscopy; canine and feline dysostosis; orthopedic disease, such as cranial cruciate disease; elbow and hip dysplasia; and oncologic and reconstructive surgery. In the 2007 book “In Their Shoes,” written by Deborah Reiber, Dr. Langenbach was featured as an occupational example for young women. In 2016, Dr. Langenbach passed the ACVSMR examination and became board certified in sports medicine and rehabilitation.

In her free time, Dr. Langenbach enjoys mountain biking, running, gardening, and spending time with family and friends. She lives with her husband and their three children and their beloved pets in Vienna, Virginia.

Dr. Julie Marie Gillem, DVM, DACVIM (Oncology)

Julie-Gillam

Dr. Julie Gillem is the medical oncologist on staff at Dogs and Cats Veterinary Referral.

Dr. Julie Marie Gillem joined the DCVR staff in August 2016. Dr. Gillem is originally from Arlington, Virginia. She graduated from the Virginia?Maryland Regional College of Veterinary Medicine in 2012 and subsequently completed a one year rotating internship in small animal medicine and surgery at the University of Tennessee College of Veterinary Medicine. Dr. Gillem will complete her residency at the University of Pennsylvania College of Veterinary Medicine in July 2016. She enjoys learning about all aspects of veterinary oncology, but has a special interest in canine and feline lymphoma. Dr. Gillem thoroughly looks forward to further developing the oncology department at Dogs and Cats Veterinary Referral and Emergency and working with fellow specialists, emergency doctors, and interns.  She is also eager to cultivate and establish relationships with referring veterinarians in the area.  In her free time, Dr. Gillem enjoys spending time with her husband, family, friends, and pet dogs, Shorty (17) and Gabriel (3).

Nicole Guma, DVM, DACVIM (Internal Medicine), DACVECC

Nicole Guma

Dr. Nicole Guma is a staff internal medicine specialist at Dogs and Cats Veterinary Referral.

Dr. Guma grew up on Long Island in NY. She attended veterinary school at Cornell University and graduated in 2005. Following graduation she pursued a rotating internship in small animal medicine and surgery at Affiliated Animal Care in Chesapeake, VA. She completed a dual residency in internal medicine and emergency/critical care at VCA Veterinary Referral Associates and became board certified in critical care in 2010 and board certified in internal medicine in 2011. She worked as a staff criticalist at VCA SouthPaws from 2011-2014.

Nicole and her husband Ethan have lived all over the country due to her husband’s military career but they are happy to be settled in the DC/Annapolis area. They have two dogs and two cats and recently welcomed a baby boy.

Steve Garnett, DVM, DACVS

Steve GarnettDr. Steve Garnett leads the Dogs and Cats Veterinary Referral & Emergency surgery department.

After earning his DVM from Ross University School of Veterinary Medicine in St. Kitts, West Indies, Dr. Garnett completed his clinical year at Virginia-Maryland Regional College of Veterinary Medicine in Blacksburg, VA. Following this, Dr. Garnett completed a one year small animal rotating internship at Fifth Avenue Veterinary Specialists in New York City. After the internship, he moved on to a surgical residency at Metropolitan Veterinary Hospital in Akron, OH. Dr. Garnett looks forward to further developing the surgery department while working in close relation with fellow specialists, emergency clinicians and referring veterinarians. Dr. Garnett enjoys all aspects of soft tissue and orthopedic surgery, however, he holds special interest in GI, intra-thoracic and minimally invasive surgery.

Click here to visit the Surgery Department page.

Sarah Tibbs, BVetMed, DACVR

Dr. Sarah Tibbs is a board certified Radiologist.

Dr. Tibbs completed her diagnostic imaging residency at the University of Minnesota, College of Veterinary Medicine. Prior to this, she had an imaging internship at Mississippi State University and a rotating internship at Veterinary Specialist of South Florida. Dr. Tibbs is excited to be developing a radiology department at Dogs and Cats Veterinary Referral and Emergency, which includes direct outpatient consultations for radiographs as well as ultrasound and computed tomography scanning. Her main interest is ultrasonography, however she also relishes the advanced imaging technologies of CT and MRI.

Click here to visit the Radiology Department page.

Dharshan Neravanda, DVM, DACVIM (Neurology)

Dharshan NeravandaDr. Dharshan Neravanda is a board-certified Veterinary Neurologist/Neurosurgeon.

Dr. Neravanda earned a DVM from Cornell University College of Veterinary Medicine in 2003 and completed a rotating medicine and surgery internship at North Carolina State University College of Veterinary Medicine the following year. After a year of private practice in New York City, he moved south to Athens, GA. There, he completed a one-year Neurology Internship followed by a 3 year Neurology and Neurosurgery Residency at the University of Georgia College of Veterinary Medicine. Although Dr. Neravanda enjoys all aspects of veterinary medicine and neurology, he has a strong background and interest in MRI and neurosurgery. Dr. Neravanda joined the practice in 2009.

Click here to visit the Neurology Department page.

Luis Braz-Ruivo, DVM, DACVIM (Cardiology)


Dr. Luis Braz-Ruivo is a board certified veterinary cardiologist. A native of Portugal where he graduated from the University of Lisbon in 1986, he then moved to Canada where he proceeded to obtain an internship in Small Animal Surgery and Medicine at The Ontario Veterinary College in Guelph, Ontario. After finishing his internship he went on to start his advanced training in veterinary cardiology at the Ontario Veterinary College, University of Guelph. With his residency training he also obtained the Doctor of Veterinary Science degree and completed his studies in 1999. Dr. Braz-Ruivo then ran a mobile cardiology service in the greater Toronto area before moving to the United States where he worked for a while at the Rowley Memorial Animal Hospital and Angell Memorial Animal Hospital, in Massachusetts.

In 1999, he moved to Maryland, where he and Dr. Kathy Arrington established the foundation for the now existent Dogs and Cats Veterinary Referral & Emergency. Dr. Braz-Ruivo has been board certified by the American College of Veterinary Internal Medicine (www.acvim.org) since 1996. He enjoys all aspects of veterinary cardiology in small animals, but he has a particular interest in the treatment of congestive heart failure, diagnosis of congenital heart disease in breeding dogs, and interventional cardiology.

Dr. Braz-Ruivo now works a part time schedule here at DCVR. Please call to inquire about appointment availability.

Robin Pullen, VMD and Diplomate , American College of Veterinary Internal Medicine

Robin Pullen

Dr. Robin Pullen is an internal medicine specialist at Dogs and Cats Veterinary Referral Hospital and has been associated with the hospital since 2008. Dr. Pullen received her veterinary degree from the University of Pennsylvania School of Veterinary Medicine where she graduated Cum Laude. She completed a Small Animal Rotating Medicine and Surgery Internship at the University of Pennsylvania School of Veterinary Medicine and completed her Internal Medicine Residency from the same institution 2 years later. Dr. Pullen is Board Certified by the American College of Veterinary Internal Medicine with a Specialty in Small Animal Internal Medicine. Since 2010 Dr. Pullen has taught at Massey University Veterinary Teaching Hospital in New Zealand. She has also lectured at numerous educational conferences both here and abroad. Her professional interests include: Gastroenterology, Nephrology, Hepatic disease, Endocrine Disorders, Medical Oncology, and Immune Mediated diseases. Dr. Pullen received the Upjohn Award for Proficiency in Small Animal Clinical Medicine, the Everingham Prize for Cardiology – for outstanding work in Small Animal Cardiology, and during her tenure at the University of Pennsylvania School of Veterinary Medicine was a Dean’s Scholarship recipient. She has traveled throughout Europe and South Africa. Dr. Pullen is a member of the Beta Chapter of Phi Zeta – Veterinary Medical Honor Society.

Lauren DiVanna, DVM

Lauren DiVannaDr. Lauren DiVanna is a staff emergency clinician.

Dr. DiVanna graduated from Virginia-Maryland Regional College of Veterinary Medicine in 2009. After receiving her DVM degree, she returned to her home state of Maryland and completed a rotating small animal internship here at DCVR. Following the completion of the internship she was hired as a staff emergency doctor in June, 2010. Her special interests include critical care and surgery. Dr. DiVanna was recently married; you may remember her as Dr. Jones. She lives with her husband, 1 dog- Louie, and 3 cats – Ben, Meowit, and Tigger. In her free time she likes to travel, exercise and spend time with friends.

Click here to visit the Emergency Department page.

Natasha Olán, DVM

Natasha OlanDr. Natasha Olán is a staff emergency clinician.

Dr. Olán joined Dogs and Cats Veterinary Referral & Emergency in the spring of 2014. She finished her critical care residency in 2014, at The Animal Medical Center in New York City. Prior to this, Dr. Olán completed her veterinary degree at Ross University School of Veterinary Medicine, with her clinical year at Virginia-Maryland Regional College of Veterinary Medicine. She did a rotating small animal medicine and surgery internship at Fifth Avenue Veterinary Specialist in New York. While Dr. Olán enjoys all aspects of critical care medicine, her specific areas of interest include critical care nutrition, polytrauma, toxicologic emergencies, and pain management.

Click here to visit the Emergency Department page.

Melissa Kelly, DVM

Melissa KellyDr. Melissa Kelly is a staff emergency clinician.

Dr. Kelly completed her undergraduate degree in Biological Sciences at University of MD, Baltimore County, and earned her veterinary degree from the University of Illinois. Following graduation she returned to Maryland, as she is a Catonsville native, to complete a rotating internship here at DCVR. She became a staff emergency clinician upon completion of her internship. Dr. Kelly has three cats: Satchel, Paige, and Leroy (and may be a baseball fan).

Click here to visit the Emergency Department page.

Jessica Steere, DVM

Jessica Steere

Dr. Jessica Steere is a staff emergency clinician.

Dr. Steere graduated from St. George’s University School of Veterinary Medicine in 2010 after completing her clinical year at Louisiana State University. She worked for 3 years in New Orleans, LA as head emergency clinician at a multi-specialty practice before moving north to the Mid-Atlantic. She joined Dogs and Cats Veterinary Referral Center in 2015.

Dr. Steere enjoys the challenges of emergency medicine, as well as surgery and critical care. She lives with her husband, Dan, their two dogs, Xande and Iris, and their cat, Tituba. When she is not working, Dr. Steere spends time training for marathons and ironman distance triathlons. She completed her first full Ironman in 2013 in Lake Placid, NY, and looks forward to many more!

Kathryn Bonistalli, BVSc, MVSc

Kathryn Bonistalli

Dr. Bonistalli is a Maryland native who graduated from Massey University in New Zealand in 2010 with a Bachelors Degree in Veterinary Science (BVSc). She returned to the US and completed a rotating internship at Dogs and Cats in 2012. During her internship she completed a Masters of Veterinary Science Degree (MVSc) in also from Massey University (focus on Epidemiology and Immunology). She left Dogs and Cats after her internship and worked in private practice for several years before realizing that she missed the challenge and excitement of Emergency Medicine too much to stay away from it and returned to Dogs and Cats in 2015. She lives with her husband Andy and two sphinx cats Bubba and Brisco. She and Andy enjoy traveling the globe, eating, cooking, and spending time with friends and family.

Cathryn Doyle, DVM, MPH

Dr. Doyle completed her veterinary training at the Virginia-Maryland Regional College of Veterinary Medicine in May 2013 and continued her education with Virginia Tech to complete a Masters of Public Health in December 2013. She completed a rotating internship in emergency medicine and internal medicine at the Greenbrier Veterinary Emergency Center in Virginia Beach, VA in June 2015 and moved back home to Glen Burnie, MD to continuing working as an emergency veterinarian. Dr. Doyle joined the emergency team at Dogs and Cats Veterinary Referral and Emergency in December 2015 and is excited to continue expanding her veterinary skills and knowledge. Her special interests include zoo and wildlife medicine, infectious diseases, and critical care. She lives at home with her dog, cat, gecko, boa constrictor, and budgie. In her free time, she enjoys volunteering as a zoo animal educator, spending time with friends, and traveling to as many exotic places as she can!

Dr. Karen Lyons, DVM

Bio coming soon.