About Us 

Our Doctor

Dr. Jon Bertoldo is the sole practitioner at Animal Mansion Veterinary Hospital. Unlike large corporate hospitals, Dr. Jon's private practice guarantees he will get to know your pet well.  

Dr. Bertoldo received his doctorate of veterinary medicine from Cornell University in 1994.  He began his veterinary career in Upstate New York and moved to New Jersey where he practiced both large and small animal medicine before specializing in small animal care full-time, and has been doing so for the past 20 years.

​In 2008, Dr. Bertoldo opened his own practice in the historic Hainesburg Mansion in Columbia, NJ.  In addition to veterinary medicine, Dr. Bertoldo's passions include photography, vintage cars, and spending time with his family.  Dr. Bertoldo also currently serves on the Alumni Board at the Cornell University College of Veterinary Medicine.      

The History of the Building

The historic Hainesburg Mansion nestled in the Hainesburg valley was built in 1828 by architect Andrew Smith.   In its backyard are the remnants of the former Delaware, Lackawanna, and Western Railroad lines which ran alongside the Paulinskill River and feeds into the Delaware River.  It was sold to railroad tycoon Jacob M. Blair around 1843 and then acquired by Jacob Andress in 1885.  Andress and his family made the mansion their home for many years.  Since then, it has changed ownership many times, establishing itself as an inn, a restaurant, an ice cream parlor, even a speakeasy at one point in history.  In 2008, Dr. Jon Bertoldo acquired the Mansion in an attempt to maintain its Victorian charm and make it a veterinary practice unlike any other. It is more than just a veterinary practice, it feels like home.
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Our Team 

 Our practice would not be what it is without the group of highly skilled, patient, and caring veterinary technicians as well as our compassionate and knowledgeable staff.  Their love of animals can be seen in their care; whenever your pet is being treated, they treat your pet like their own.