Laser therapy helps relieve pain in pets suffering from acute and chronic conditions.
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Dr. Trina Steffen, our Chief of Staff, grew up and currently resides in West Allis, Wisconsin. She received both her undergraduate and DVM degrees from the University of Wisconsin – Madison. Prior to joining the West Allis Animal Hospital team, Dr. Steffen practiced at the Veterinary Referral and Emergency Center in Norwalk, Connecticut, BluePearl Veterinary Partners in Northbrook (Chicago), Illinois, and Lakeshore Veterinary Specialists in Oak Creek, Wisconsin. She is thrilled to be practicing at the clinic that took care of her family’s dog when she was a child. Her special interests include emergency medicine, internal medicine, and pain management.

Outside of work, Dr. Steffen enjoys reading, gardening, and re-discovering the city that she grew up in through the eyes and mindset of her son. She has 2 cats (Bruce and Clark) and an English Bulldog named Buckingham(Bucky).

Dr. Brian Nelson, DVMDr. Brian Nelson is a 1978 graduate of Iowa State University College of Veterinary Medicine. He grew up in central Iowa and moved to Wisconsin after graduation. Dr. Nelson began working at West Allis Animal Hospital in August 1978 working for Dr. W. G. Schwalbe and ended up buying the practice from him. He has special veterinary interests in general medicine, soft tissue surgery, laser surgery, and ferret medicine and surgery.

Dr. Nelson met his wife Karen in West Allis and they have three grown sons, two dogs, and one cat. In his spare time he enjoys golf, racquetball, music, movies, and spending time with family and friends. After almost 40 years of practice there are still things he hasn’t seen yet and that keeps him interested!

Dr. Karen Selbert, DVM with dogDr. Karen Selbert received her undergraduate degree in Communications from Truman State University (formerly Northeast Missouri State University) and then earned her DVM from the University of Missouri in 1998. She began practicing at the Eastside Animal Hospital in southern Indiana and helped grow their practice for the next nine years including helping facilitate the founding of the Go Rover Go Dog Agility Training Center.

In 2007 Dr. Selbert relocated with her husband, a Presbyterian minister, to O’Fallon, Illinois who began working with a church development near Scott Air Force Base. She became a principal veterinarian for the Troy Hawthorne Animal Clinic, participating in emergency care responsibilities with their 24-hour emergency and referral practice in Glen Carbon, Illinois. She also established the first dog park in Troy and offered dog agility classes there as well.

Dr. David Mentjes, DVM with DogDr. Mentjes has been practicing in the Milwaukee area since graduating from the University of Illinois at Champaign-Urbana in 1993. He joined the staff of West Allis Animal Hospital in 2007. Prior to joining the West Allis Animal Hospital team, Dr. Mentjes practiced in Greenfield and Menomonee Falls, Wisconsin. His special interests include wellness care, general medicine and surgery.


Dr. Kaylyn Goertz grew up in West Allis and received her undergraduate degree in Biology at Carroll University in Waukesha, WI. Prior to veterinary school, she volunteered at a nature center and a wildlife rehabilitation center. She received her DVM degree from the University of Wisconsin – Madison and returned to her hometown to join the West Allis Animal Hospital team in 2019. Her favorite part about working with animals is building relationships with her patients and their families.

In her free time, Dr. Goertz’s interests include music, camping and hiking, and traveling, especially to national parks and natural areas. Her favorite travel experiences include Acadia National Park in Maine and lower Antelope Canyon in Arizona. She currently resides in West Allis with her Beagle mix named Ted, Chihuahua mix named Izze, and a cat named Smidge.