staff

The Valley Veterinary Emergency and Referral Center is staffed 24 hours a day, 365 days a year by dedicated, highly trained and motivated professionals.

State of the art treatment and compassionate care of your pet is our ultimate goal. We appreciate the human-animal bond and treat all patients as if they were our own pets relying on our diligence, judgment and care.

Veterinarians

Marcos Haase, DVM:

Dr Haase is a 2001 graduate from the school of veterinary medicine of Universidad Austral, located in Valdivia, Chile. After moving to the United States in 2001, he was accredited by the Educational Commission for Foreign Veterinary Graduates of the American Veterinary Medical Association and in 2003 obtained his license to practice in the United States. He worked in an emergency practice as well as general practice before taking a position as a staff veterinarian for VVERC in 2006. In February of 2008, he was appointed Medical Director for VVERC. Currently he resides in Winchester, VA with his wife Amy (who is also a veterinarian), their children (Ethan and Isabel), and their three cats. In his spare time, he enjoys spending time with his family, outdoor activities and road biking.

Katherine Hollengreen, DVM:

Dr Hollengreen graduated from the Virginia-Maryland Regional College Of Veterinary Medicine in 1993.  She began practicing emergency medicine within six months of graduation and has remained in this field ever since.  She particularly enjoys purebred dog breeding and neonatal care as her family had a show dog kennel while she was growing up.  On some of her days off from VVERC, she is a relief veterinarian for a daytime practice. She feels that the opportunity to practice general in addition to emergency medicine makes her a well rounded veterinarian.  In her time off she enjoys long walks with her three Border Collies, playing with her multiple cats, working on her farmhouse and spending time with family and close friends.

Jean Loonam, DVM

Dr. Loonam received her Bachelor's degree from Virginia Tech in 1996 and her Doctorate of Veterinary Medicine from the University of Tennesse in 2000. She completed a small animal rotating internship at the Regional Veterinary Referral Center in 2001, followed by a soft tissue surgical fellowship at the University of Tennessee in 2002. She has also worked at a general practice in Middleburg and an emergency hospital in Florida. She has worked part-time for VVERC since 2001.

Roo Makosky, DVM

Dr. Makosky received her BA from St. Mary's College of Maryland in 1992 and graduated from the Virginia-Maryland Regional College of Veterinary Medicine in 1998. After completing an internship in small animal medicine and surgery she returned to Virginia and has been involved with both general primary care practice as well as emergency practice. Her medical interests include pain management, critical care, and geriatrics. She has also completed certification in veterinary acupuncture. Dr. Makosky lives in Fauquier County with her husband and two sons. They share the house with one dog, two indoor cats and five outdoor cats. In her spare time, she enjoys running, gardening, and reading.