Animal Hospital Specialty Center – Colorado


Animal Hospital Specialty Center

5640 County Line Pl Suite #1

Highland Ranch, CO 80126

Phone:  303-740-9595

Fax : 303-740-9569



Year Established: 2011

Average Annual Number of Treatments: 36

Average Annual Number of Patients: 14

   CRRT: No  Charcoal Perfusion: Yes  Plasmapheresis: No  Apheresis:  No Peritoneal Dialysis : Yes


Team Members: Geoff Heffner, DVM, DACVECC, Samantha Archer, CVT


 Geoff Heffner, DVM, DACVECC

Role In Unit:  Critical Care Specialist, Hemodialysis Chief of Staff
Special Interest: Acute kidney injury, hemoperfusion, urinary stent procedures
Internship: Garden State Veterinary Specialists
Residency: University of Florida


Growing up in southeast Michigan, Dr. Heffner attended Michigan State University for his undergraduate degree in physiology and to complete his Doctorate in Veterinary Medicine.  During his tenure at MSU, he was active in equine sports medicine research, providing international travel and lecture opportunities.  Upon completing his years in clinical rotation, Dr. Heffner returned to his interests in small animal clinical medicine, accepting an internship at Garden State Veterinary Specialists along the New Jersey shore.

After finishing the internship, Dr. Heffner traveled north to New England for his residency in Emergency and Critical Care Medicine at Tufts University.  There, he developed his current interests in hemodialysis, pulmonary disease, therapeutic ventilation, and advanced cardiovascular monitoring.  Dr. Heffner has since gained additional training in hemodialysis at Tufts University, University of California, and the University of Florida.

Since 2010, Dr. Heffner has been the Critical Care Specialist at Animal Hospital Specialty Center, located in Denver. The American College of Veterinary Emergency and Critical Care is a relatively new addition to the specialties and sub-specialties currently available to the profession.  As an evolving specialty, our objective is to provide continuous therapy for animals in the critical time period between the emergency visit and road to recovery.

As a board certified criticalist, Dr. Heffner provides intensive oversight for emergency doctors and technicians through case rounds, topic lectures, wet-labs and direct mentorship, elevating the quality of care provided to patients around the clock.  One of his primary responsibilities is to operate the very busy intermittent hemodialysis ward, offering extracorporeal therapies to patients with acute kidney injury, chronic kidney failure or toxin management.  Additionally, Dr. Heffner performs interventional radiology stenting procedures to facilitate the treatment of several respiratory and urinary abnormalities.

Samantha Archer, CVT

Role In Unit:    Critical Care Technician

Samantha was born in Australian, but moved to Denver when she was seven years old.  She received veterinary technician certification at Bel-Rea Institute in 2011.  She has since work as an Internal Medicine Technician and Oncology Technician at Animal Hospital Specialty Center, before accepting her current position in the Critical Care Unit.  Samantha has received extensive clinical training in hemodialysis and has become an integral part of the program offered at A