Veterinarians & Staff

We make every attempt to continuously upgrade both our facilities and our skills in order to better care for the needs of our clients and their pets. Each veterinarian attends at least twelve hours of continuing education per year. In addition, each has developed special areas of expertise, and seek to improve their skills in these areas through additional conferences and reading which provides better in-house services to our clients. We meet as a group daily to discuss all current cases to ensure the knowledge and attention of several veterinarians rather than just one.

Our Veterinarians 


Dr. LangfordDr. Langford

Dr. Langford was born in Nebraska and grew up in several states, as his family moved frequently.  He attended Virginia Tech and was awarded the Doctor of Veterinary Medicine, Cum Laude, degree from the University of Georgia. Later he was board certified for twenty years in canine and feline practice. He and his wife have made St. Mary's County their home since 1977.

His personal practice areas of interest include: soft tissue surgery, allergy, and endocrinology. He is a member of several professional and civic organizations and he attends many continuing education seminars each year to continually update his knowledge of new procedures and practices in the field. He also has an interest in Veterinary hospital management education.

Dr. Langford has several hobbies outside of work, including fishing, tennis, and antique vehicle restoration. He and his wife Diane enjoy travel and other outdoor activities. Their children are grown, but they have several pets to keep them company.  They are now proud grandparents.

Dr. Langford and his wife spend a week each September helping the Lakota people on the Pine Ridge Indian Reservation with their veterinary needs. This is through an organization called CVM; if you would like to find out more about this organization, please visit

Dr. PilkertonDr. Sara Pilkerton

Dr. Sara Pilkerton was raised in Clements, Maryland on her family’s tobacco and hog farm. She graduated from St. Mary’s Ryken High School in 1997. She enrolled in the College of Notre Dame of Maryland and graduated in 2001 with a Bachelors in Biology. Following graduation, Dr. Pilkerton received the Kirby Foundation Fellowship which allowed her to participate in cancer research at the John Hopkins University for two years. Dr. Pilkerton received her Doctor of Veterinary Medicine from the Virginia Maryland Regional College of Veterinary Medicine in 2008.

Dr. Pilkerton looks forward to pursuing her professional interests, including endoscopy and ultrasonography. She keeps her skills up to date by attending local and national continuing education meetings.

Dr. Pilkerton currently resides in Clements, Maryland with her husband, Lee, her two daughters, two cats, and a dog. Dr. Pilkerton enjoys traveling with her family in her spare time.

Dr. MattesonDr. Matteson

Dr. Matteson was raised in a Navy family and during her childhood lived on the East Coast, in Idaho and, overseas in Italy. She received her bachelor's degree Kenyon College in Ohio and her DVM degree from the Virginia-Maryland Regional College of Veterinary Medicine. She practiced first in  Toronto, Ontario, Canada, before moving to Southern Maryland. She practiced in Calvert County, before she joined the Three Notch Veterinary Hospital Staff. February, 1996.

Dr. Matteson enjoys all aspects of veterinary medicine, but has particular interest in surgery and cardiology. In addition to her many canine and feline patients, she has an interest in and treats ferrets and other small mammal pets. She regularly attends veterinary conferences to study the latest in veterinary medicine and surgery.

Outside of work, Dr. Matteson enjoys motherhood, riding her horse, running and her hobbies. She is active in her church and in the Boy Scouts. Dr. Matteson lives in St. Leonard with her husband, Johnny, and two children Ethan and Siena, and a few "misfit" pets.   

Dr. IronmongerDr. Ironmonger

Dr. Ironmonger was raised in Hampton, Virginia. She obtained her bachelor's degree in 1981 from the College of William and Mary in Williamsburg, Virginia, and earned her Doctor of Veterinary Medicine degree at the Virginia-Maryland Regional College of Veterinary Medicine in 1985. She practiced in Virginia Beach her first year out of school, then spent the next six years associated with a small animal hospital in Newport News, Virginia.

She came to St. Mary's County in September, 1992 and joined the staff of Three Notch Veterinary Hospital and Park Veterinary Clinic. She particularly enjoys internal medicine, especially cardiology and dermatology. In addition to taking care of dog and cat patients, she has additional expertise with rabbits and other small mammal pets.

In 2006, she became Board Certified by the American Board of Veterinary Practitioners (canine and feline). She is only the fourth veterinarian in southern Maryland to achieve this distinction.

Dr. Ironmonger and her husband, Mike, have four grown children and two cats. Some of their favorite activities include boating, running, and RV travel.

Dr. O'ConnorDr. O'Connor

Dr. O'Connor was born and raised in Leonardtown, Maryland. She graduated from St. Mary's Ryken High School in 1988 and attended St. Mary's College, graduating with her Bachelor's in biology in 1992.  She moved to Baltimore and worked in a research laboratory at John Hopkins University for two years before applying to Veterinary School.  

She attended veterinary school at Virginia-Maryland Regional College of Veterinary Medicine, graduating in May of 1998. She worked for a veterinary practice in Charles County for one year before joining  the staff Three Notch Veterinary Hospital in July 1999.

Dr. O'Connor's professional interests include internal medicine and soft tissue surgery utilizing our laser unit. She also has a special interest and additional training in ultrasonography of the abdomen and heart of cats and dogs. She regularly attends both local and national continuing education courses yearly to update her skills in veterinary medicine.

Dr. O'Connor and her husband live in Lusby with their three cats...

Dr. FeldhausDr. Feldhaus

Dr. Feldhaus was born in Washington, D.C. and raised in Potomac, Md. She received her Bachelors degree from Loyola College in 1985, and her DVM degree from the Ohio State University in 1989.

She has practiced in Washington, D.C., Toledo Ohio, and Southern Maryland. Dr. Feldhaus enjoys all aspects of veterinary medicine. She regularly attends educational seminars to keep her skills current.

In 2005, she enrolled in an advanced training program in veterinary acupuncture offered by the International Acupuncture Society in California. She completed her acupuncture certification in the fall of 2006. As a Certified Veterinary Acupuncturist she now offers acupuncture treatment for dog and cat patients.

Dr. Feldhaus resides in Leonardtown with her husband, Bob, their son Mark, and numerous pets.

Dr. YasudaDr. Yasuda

As a part of a military family, Dr. Yasuda grew up in Japan, Illinois, Hawaii, and Anne Arundel County. She received both her bachelor’s and DVM degrees from Cornell University, graduating from veterinary school in 1989. After a stint in Western Maryland caring for farm and pet animals, she moved to Southern Maryland. She worked in Calvert County before coming to Three Notch in 2007.

Dr. Yasuda enjoys the variety of challenges provided by veterinary medicine, particularly dentistry, internal medicine, and exotic pets. Attendance at continuing education meetings as well as participation in a veterinary on-line association help to keep her knowledge up to date.

When time and weather permit, Dr. Yasuda enjoys photography, motorcycling, swimming, and calligraphy. She lives in St. Leonard with her husband, daughter, and cat.

Dr. Tammy Dorsch, DVM

Dr. Tammy Dorsch

Dr. Tammy Dorsch received her DVM degree from Ross University School of Veterinary Medicine.  Dr. Dorsch completed her clinical year at Purdue University. She obtained her bachelor’s degree from Middle TN State University with a double major in biology and chemistry.  She practiced in Waldorf and Clinton Maryland before coming to joining Three Notch Veterinary Hospital team.

Dr. Dorsch is a member of Maryland Veterinary Medical Association, Veterinary Information Network, and regularly attends local and national continuing education to keep her veterinary skills updated.  Her particular interest is in soft tissue surgeries and internal medicine. She has special interest in exotic pets and brachycephalic breeds.

Dr. Dorsch resides in Charlotte Hall with her husband, Anthony and their two children, dogs and a ferret. Outside of veterinary medicine, she loved spending time outdoors going on hikes and bike rides.


Dr. Doug Margulies, VRMCVM

Dr. Doug Margulies

A Maryland native, Dr. Margulies attended Goucher College for his bachelor’s degree and Virginia-Maryland Regional College of Veterinary Medicine (VRMCVM) for his veterinary degree.  A lifelong student, Dr. Margulies also has degrees from Lincoln Technical Institute (automotive technology), Montgomery College (Associates), and the University of Maryland Smith School of Business (MBA).

Dr. Margulies has special interests in small animal internal medicine, surgery (soft tissue and orthopedics), and dentistry.  He regularly attends local and state association meetings, as well as continuing education seminars to keep his knowledge up to date.

He moved to St. Mary’s County in 2017 to join the Three Notch Veterinary Hospital team.  He and his wife, Katie, have two dogs, Chief and Woogie.  Outside of work, Dr. Margulies has several hobbies including restoring vintage cars and motorcycles, playing and collecting vintage guitars and amplifiers, and photography. 


Dr. Alina McClain

Dr. Alina McClain is originally from Denver, NC.  She obtained her Bachelor's Degree at the University of Notre Dame and went to Ross University School of Veterinary Medicine to earn her Veterinary Degree. Her husband, John, is a Lieutenant Commander in the US Navy and is currently a student at the US Test Pilot School. She lives in Leonardtown with her husband and two daughters, Sydney and Amelia, along with her three dogs, Cera, Lauri, and Toby, who keep her busy and enjoy going on nature walks. Prior to moving to the Southern Maryland area, Dr. McClain lived on Whidbey Island in Washington State.  They are very happy to be back on the East Coast and are enjoying less rain and grey skies!

 In her free time, Dr. McClain enjoys going to the beach, swimming, crocheting, cooking, and hiking. Her family also enjoys taking their RV into the mountains and camping.