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. 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. O'Connor

Dr. Jennifer 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. MattesonDr. Jennifer 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. Rebecca 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. Feldhaus

Dr. Jeanne 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. Cheryl 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.

 About Us

Three Notch was founded in 1979 by Drs. David Langford and Michael Veitch.  They added Park Veterinary Clinic in 1986.  Their desire in starting their own practice was to bring to Southern Maryland a higher quality veterinary standard for the animals and their owners.

Three Notch was the first animal hospital in Southern Maryland to be accredited by the American Animal Hospital Association (AAHA), which is achieved by only 15% of hospitals in the US. Later, they were the first and only facilities in St. Mary's County to have a Board Certified Veterinarian on the staff.  Sadly, in 2012, Dr. Veitch passed away.

In 2018, Dr. Langford retired after 41 years of practice. 

Our experienced management team is committed to maintaining the culture that Three Notch and Park are known for.