The Sugar River Animal Hospital is proud to introduce our clients to our incredible veterinary team! Our highly-trained team members have been hand-picked to provide the most exceptional care possible to our patients. We invite you to scroll through our bios to learn more about our team members. Have questions? Contact us today and we’ll be happy to assist you!

Veterinarian: Dr. Catherine MacLean


Dr. MacLean completed her Bachelor of Science from Penn State University, her Doctorate of Veterinary Medicine from Atlantic Veterinary College, and her pet acupuncture certification from Chi Institute. Her areas of special interest include general practice and acupuncture. She opened Sugar River Animal Hospital in 2013, and she has been practicing veterinary medicine since 2010. Dr. MacLean’s family consists of her husband Matt, her daughter Katarina, and their three pets: Jack and Misty, two cats, and Arrow, a dog. When she isn’t working, Dr. MacLean enjoys skiing, cooking, reading, gardening, and spending time with her family and friends.

Veterinarian: Dr. Peterson – Internal Medicine Specialist

Dr. Peterson is a board-certified small animal internist with 27 years of practice experience, 18 of which have been spent in specialty consulting practice. He is a 1987 graduate of the University of Tennessee, College of Veterinary Medicine. In 1988, he completed a rotating internship in small animal medicine and surgery at the Veterinary Hospital of the University of Pennsylvania. After a year of emergency practice, he returned to academia to pursue specialty training, and completed a residency in small animal internal medicine at the Cornell University College of Veterinary Medicine in 1991. In 1996, following five years of referral practice, he opened InterMed Veterinary Internal Medicine Consultants, LLC, an ultrasound, echocardiography, and endoscopy-based mobile small animal internal medicine consulting practice serving Connecticut and Western Massachusetts. In the fall of 2011, Dr. Peterson and his wife and daughter moved to Pomfret, Vermont. Since coming to the Upper Valley, he has continued to serve his long-standing client hospitals, traveling south on Wednesday mornings and returning home on Fridays. He sees patients in Vermont and New Hampshire on Mondays, Tuesdays and Friday afternoons.

Veterinarian: Dr. Andrea Brown

Dr Andrea Brown received a BS in Biology from Samford University in Alabama and a MSc One Health (Infectious Diseases) from both Royal Veterinary College and the London School of Hygiene and Tropical Medicine. She studied Veterinary Medicine at Auburn University. Andrea has over 20 years of local experience with our pets. She lives locally with her family and many assorted pets.

Veterinarian: Dr. Lisa Colgan

Dr Lisa Colgan received her Bachelors of Animal Science from the University of New Hampshire, and her Doctorate of Veterinary Medicine from The Ohio State University in 2001. She grew up in Sunapee and returns to us after practicing in the Boston area for 15 years. She is proud to integrate both Eastern and Western medicine when she works with her patients. When helping our pets she loves to spend time outside running and hiking with her husband Quinn and her two dogs Davin & Cricket.

Receptionist and Technicians

mandy-dowMandy Dow
Mandy joined our team in 2015 with over six years of experience working with pets and certification in dog care and pet nutrition. Growing up in Vermont, she has been around an array of domestic animals throughout her life, including rabbits, ferrets, dogs, and cats. She also rode horses and participate in a 4-H Alpaca Project. As one of our receptionists/technicians, she loves being able to help humans and their pets stay happy and healthy. She also loves providing education and resources to owners as well as the ongoing learning experience she receives herself. Her own pets are Winny, a wire-haired dachshund mix and the occasional foster dog. Mandy fosters for several rescue groups and has a passion for Australian shepherds, border collies, and rough collies. In her spare time, she enjoys hiking, gardening, trips to Cape Cod and Maine, and taking road trips with her dog. She also does pet sitting in her home and runs a hobby photography business called Wiener Dog Art Photography.

sarah-dileySara Diley, CVT
Sara started out at U.V.V.S in 2005 and worked her way through to become a veterinary technician. She attended Vermont Technical College and graduated in 2010 with a degree in Veterinary Technology. She passed her VTNE to become certified 3 months later. Sara continued her work at U.V.V.S for a number of years and also held the head technician position, later becoming the Secretary of the Vermont Technician Association

She then moved to Newbury Veterinary Clinic in Newbury, VT, and loved walking dogs and providing care to her patients. A year and a half later her husband got a job for a wind turbine company in Lempster, NH and now has found a home working at Sugar River Animal Hospital.

She currently has 2 Boston Terriers, a Great Dane, a cat, 6 chickens, and a Nile Monitor. She loves all creatures and being outdoors. She enjoys helping out as much as possible whether it be human or animal. She is a generally sunshiny person to be around and you will often find her with a smile.

Kate DelGrosso, CVT
Kate DelGrosso, CVT has an eclectic education starting with a BA in English and an MA in Literature. After several years in corporate America working for various publishing houses, she quit her job and went back to school while working nights in a 24 hr Emergency Referral Animal Hospital in Indiana. After 6 years, she finished an AAS in Veterinary Science and passed her VTNE board exam in 2007. She is excited to be back in vet medicine after a hiatus spent raising her two-legged children to elementary school age. Kate has special interests in dentistry, canine training, canine reproduction and physical therapy/rehabilitation.

In her spare time, she can be found roaming the foothills with an assortment of collies, showing her dogs in most AKC sports and driving the mom taxi to and from every soccer, baseball or dance event this side of Concord. She is supported in all her endeavors by her husband, two children, two cats, all the Gateside collies and a small flock of chickens.

Kelsey Barker, Veterinary Assistant
Kelsey became part of the SRAH team after completing her BA in Biology at Colby-Sawyer College in May of 2017 and after completing her internship with the animal hospital. Although new to the field, Kelsey is quick and excited to learn how to help owners as well as their faithful companions. Kelsey has lived in New Hampshire her whole life, enjoying playing soccer and riding horses. When she was young she enjoyed being a part of her horse 4-H group, and spending as much time riding horses and being with her dogs as possible.

Kelsey currently enjoys her two dogs, Tucker and Tallie, her horse, along with two parakeets and a bearded dragon. When she has free time, she enjoys going for hikes with the dogs, and training her young horse Edie.