Dr. Patricia Berchtold

Dr. Berchtold graduated From The Ohio State University in 1998. She then completed an intensive year-long internship in small animal medicine and surgery at Oradell Animal Hospital in New Jersey. She returned to New England in 1999 and has been practicing here since then. Recently she completed her small animal acupuncture training at the Chi Institute of Chinese Veterinary Medicine. She is pursuing training in herbal medication currently. In her free time, Dr. Berchtold enjoys reading, traveling, movies and spending time with her husband and young son Finn.

Dr. Patricia Hart

Patricia was born and raised in Miami Florida. She attended the University of Florida for both her undergraduate and veterinary education and earned her DVM degree in 1998. She moved to New England after finishing an internship at the Animal Medical Center in Cooper City, Florida.  She has special interest in surgery, emergency medicine and small mammal exotic medicine. Opening the Chelmsford Animal Hospital with her late husband Dr. Mark Engelhardt and business partners fulfilled the dream of owning her own practice.

Patricia is a dedicated mother of 2 sons, Grant and Hayden, and enjoys all the outdoor activities that New England offers. She feels fortunate to have made her home in the wonderful town of Chelmsford.

Dr. Anita Lovely

Dr. Lovely is a 2011 graduate of Purdue University School of Veterinary Medicine. While at Purdue SVM, she received the Bastien Award , recognizing her for her empathy and exceptional canine care. She has been practicing veterinary medicine for the past four years in the Franklin area, where she grew up, before joining Chelmsford Animal Hospital. Dr. Lovely has a strong interest in the areas of internal medicine and ophthalmology. She shares her home with two elderly Silky Terriers, Tiger and Roc. Dr. Lovely is a member of the MVMA, AVMA, and AAHA.

Dr. Kelly Hansen

Originally from Massachusetts, Dr. Kelly Hansen attended the University of Wisconsin where she completed two years of undergraduate studies prior to early acceptance into veterinary school. She received her Doctorate of Veterinary Medicine Degree from the University of Wisconsin, School of Veterinary Medicine in 2004. Following her graduation, Dr. Hansen completed a year-long internship in small animal medicine and surgery at VCA South Shore Animal Hospital in South Weymouth, Massachusetts. She then practiced in Southern New Hampshire for 11 years before joining our team in September of 2016.  Her areas of interests include preventative medicine, geriatric medicine, and dentistry.

Dr. Hansen currently resides in Southern New Hampshire and shares her home with her cat, Colby, and her dog, Madison. When not at work, Dr. Hansen enjoys gardening, hiking, and spending time outdoors.

Dr. Alyssa Shore

Coming Soon

Dr. Meagan Merinder

Coming Soon

Fred Ramseyer

Fred was born and raised in Utica, Ohio and grew up very familiar with mixed animal veterinary medicine. He attended The Ohio State University and finished his education at Ohio Institute of Photography and Technology with a double major in Commercial and Portrait Photography.  He met his wife Dr. Patricia Berchtold at a veterinary function that he was attending with his father and brother who are also veterinarians.  Fred and Patty moved to New Jersey where Fred practiced freelance photography and worked in a Photo Studio outside of New York City. They moved to the New England area in 1999 where Fred worked for a wine distributor for several years prior to owning the hospital. Fred and Patty have a son Finn and live in North Chelmsford. When not working, Fred enjoys golfing, cooking and traveling.


Andrea has been with Chelmsford Animal Hospital since the Fall of 2006. Prior to this she had worked in a large, 24 hour hospital for over 14 years wearing “many hats”.  She thoroughly enjoys working in the veterinary field and is extremely grateful to be a part of the CAH team.  “Working in a hospital that provides such great care and compassion for our patients and their owners is something that brings me great joy and makes me so proud to work here!”

When not enjoying our patients, Andrea likes to spend time with her family and friends, her dog Gizzy and two cats Gracie, and Otter. She also enjoys traveling, cooking, reading and being on the go!

Front Office

The friendly faces at our front desk are the first part of the team you see when you walk in and are there to help you from check in to check out. They are able to answer questions regarding heart worm and flea and tick preventative and choosing which is best for your pet. Picking up some food and need a hand out to your car? They are always happy to help. If you are looking to make an appointment and have a busy schedule, the front desk is able to help find the perfect fit into your day with our assortment of doctors and flexible hours.


The technicians make up a wide assortment of the staff from the vet techs, tech assistants, and inpatient nurses; they are there as the helping hands to the doctors. The technician you see most often will be bringing you and your pet into the appointment and getting a detailed history on the nature of the visit, trimming nails and taking blood samples. They are the ones assisting the doctors with follow up calls to make sure your pet is feeling better or giving reminders that it is time for a recheck. They are the unsung heroes that go above and beyond to give the extra care to the pet in their hands as if they were their own by staying with a post op patient or coming in after hours to check on a sick animal.


While away on your vacation we don’t want you to have any cares in the world! Rest assured your pets will be treated like family here. Our kennel staff are the friendly people you see when dropping your pet off for boarding at CAH. They continuously improve their ideas of a home away from home feeling for boarding and our smaller sized kennel allows for each pet to get the extra attention they deserve during their stay. Our kennel now offers an add on of one on one playtime, which turns out fun for everyone by getting your pet some more exercise and really creating a bond between them and staff. The kennel girls bounce around the hospital to help in all areas including assisting the doctors and keeping our hospital in tip top shape.