Your Love, Our Calling

Every pet like our own.


“Innovators. Pioneers. Animal lovers. The team at Bassler Veterinary Hospital is on a simple mission: to care for your pet like our own. Every time.”

Primary Care

Dr. Heidi Bassler

DVM, Primary Care

“Being a veterinarian is not just a job to me. It is my calling. It is what I was meant to do, and I find so much meaning in caring for your pet like I would want my own pets to be cared for. Because the bond that you two share is precious, and I take the responsibility of protecting it very seriously.”

Dr. Heidi Bassler is passionate about her work in veterinary medicine. She is often referred to as “The Cat Whisperer” though she is quick to point out that she loves dogs too! Her focus is in making sure they live as long of a life as possible, and importantly, prides herself on her ability to consistently improve their quality of life between visits. Spotting the subtle signs of pain and offering simple adjustments is integral in this. She also cares deeply about pediatric visits and senior pet health.

Dr. Bassler believes in elevating the standards of patient care. She has received advanced training in veterinary dentistry and is passionate about how oral health can improve a pet’s quality of life and life expectancy. She also has advanced training in internal medicine due to its wide ranging impact on improving the lives of dogs and cats. Because of her level of knowledge and ability, she is often asked to consult on challenging cases as a second-opinion.

Dr. Bassler earned her Doctor of Veterinary Medicine degree from Atlantic Veterinary College in Canada with several awards. Earlier in her career, she performed post-doctoral research at Cornell University. She was a pioneer in developing the rapid polymerase chain reaction test, commonly referred to as Real-Time PCR. This test uses computer technology to detect DNA from disease-causing organisms, and is frequently used today in human and veterinary laboratories. Dr. Bassler published her ground-breaking research in Applied and Environmental Microbiology. Click here to read her article.

Dr. Bassler is licensed to practice veterinary medicine in Massachusetts and New Hampshire. She is also involved in various local groups, and supports Anna Jaques Hospital, Merrimac River Feline Rescue Society, Jeanne Geiger Crisis Center, Firehouse Center for the Arts, and Newburyport’s Chamber of Commerce.

In addition to daily communications with pet owners, Dr. Bassler enjoyed educating the public through various media outlets. Her newspaper column, Paw Prints, appeared monthly in Newburyport’s Daily News. Click here for the most recent article. For almost a decade, her radio show, Your Pet’s Health, aired every Sunday morning from 8:30 am to 9:00 am on WNBP (106.1 FM).

Most importantly, Dr. Bassler understands that good communication with pet owners is essential to helping her patients feel better and stay well. Every single thing she does is about helping you and your pet live a longer, happier life together. Because you both deserve that.

Professional memberships include:

“One small cat changes coming home to an empty house to coming home.”
-Pam Brown


Dr. Tai Casagrande

DVM, DACVIM - Cardiology

Dr. Tai Casagrande is a board-certified veterinary Cardiologist. She received her Doctor of Veterinary Medicine in 2007 at the Atlantic Veterinary College, and completed a three-year residency in veterinary Cardiology at The University of Wisconsin. In 2012, Dr. Casagrande was awarded Diplomate status in the subspecialty of Cardiology by The American College of Veterinary Internal Medicine.

Dr. Casagrande performs echocardiograms (sonograms of the heart), cardiac evaluations, and cardiac consultations. She is available by appointment for cats and dogs at Bassler Veterinary Hospital.

In her free time, Dr. Casagrande enjoys reading medical thrillers, relaxing with friends and family, backyard birdwatching, and rooting for all New England teams.

Dr. Jennifer McClellan

DVM, DACVIM - Internal Medicine

Dr. Jennifer McClellan is Board Certified in Veterinary Internal Medicine.  After obtaining her Doctor of Veterinary Medicine degree from Cornell University, she completed a rigorous residency program in this field, and successfully passed the board examinations to become an internal medicine specialist, as a Diplomat of the American College of Veterinary Internal Medicine (DACVIM).

Dr. McClellan performs abdominal ultrasound and echocardiograms (sonograms of the heart). She combines her expertise as a skilled ultrasonographer and brilliant internist. Dr. McClellan consults on those cases that require her expertise in advanced imaging, offering specialist insight for case management and optimal patient care.

Dr. McClellan is available at Bassler Veterinary Hospital by referral appointment.

Dr. Geoffrey N. Clark

DVM, DACVS - Surgery

Dr. Geoffrey Clark is board certified in Veterinary Surgery. He is a native of Massachusetts and a 1986 graduate of the University of California-Davis School of Veterinary Medicine. Dr. Clark completed an internship at the renowned Animal Medical Center in New York City, followed by a three-year residency in small animal surgery at Tufts University School of Veterinary Medicine and Angell Memorial Animal Hospital.

In 1992, Dr. Clark became board certified in veterinary surgery when he successfully passed the American College of Veterinary Surgeons (ACVS) certifying examination. He was a staff surgeon at several hospitals, including West Los Angeles Veterinary Medical Group and the Animal Surgical Clinic of Seattle. In 1999, he started Veterinary Surgery of New England (VSNE), a mobile surgical referral practice. He has a specific interest in canine knee surgery, fracture repair, and oncologic surgery.

Dr. Clark was the founder and editor of Canine Sports Medicine Update and served as contributing veterinary editor for Field Trial Magazine. He has published numerous scientific papers on a variety of surgical topics and authored chapters in four veterinary textbooks. He has also had canine surgery articles published in Dog Fancy, Dog World, Versatile Hunting Dog, and Dogs in Canada. In 2002, he was the featured speaker for the 18th Annual Canine Sports Medicine Symposium at the University of Florida. Dr. Clark has been an invited speaker at more than 70 veterinary meetings in United States and Canada.

Dr. Clark resides in Durham, NH with his family. Their home is shared with three cats, an English Setter named Willow and Francis the Wonder Pug.