Our caring and compassionate veterinary care team!

Meet the Veterinarians & Team of All Creatures Veterinary Service in Big Timber! We’re pleased to provide exceptional vet care for your pets!

Please call us at (406) 932-4324 to speak to one of our caring veterinary staff members!

Kirk Johnston, DVM

Veterinarian/Practice Owner

Dr. Johnston started his career at All Creatures Veterinary Service after graduating from Washington State University College of Veterinary Medicine in 1993. He has been a co-owner of the clinic for over 20 years and enjoys mixed animal practice in our rural community. Dr. Johnston and his wife, Elizabeth, have two daughters, Jessica and Darby, and a son, Nolan, who are finishing their high school and college educations.

Dr. Johnston was born and raised in White Sulphur Springs, Montana. He attended Montana State University-Bozeman to fulfill pre-veterinary requirements.

Kirk appreciates many outdoor recreational activities that Montana has to offer including hunting and fishing, horseback riding, and camping with his family. He and his family have many pets and have raised horses for several years.

Jason Hasbrook, DVM

Veterinarian/Practice Owner

Dr. Hasbrook grew up in Big Timber. He graduated with his DVM from Washington State University in 1998. He practiced as a mixed animal vet in Buffalo, WY and Absarokee, MT prior to returning to ACVS in 2002. Shortly after returning, he became partners in ownership of ACVS.

Dr. Hasbrook enjoys downhill skiing, so much so he has been skiing every month for the last two years! He also enjoys spending time with his wife, Heather, and his two sons, John and James. He stays busy watching his sons play sports.

Jeannine Peterson, DVM

Associate Veterinarian

Dr. Peterson joined All Creatures Veterinary Service in June 2018, shortly after receiving her Doctor of Veterinary Medicine degree from Colorado State University. She attended Montana State University-Bozeman where she received her Bachelor of Science in Cell Biology and Neuroscience in 2012. Her experience in Bozeman made her want to return to Montana and practice rural veterinary medicine.

Dr. Peterson is from the small town of Tenino, Washington. She grew up on a small farm which played a large role in her becoming a veterinarian. She has three dogs at home named Greta, Sage, and Josie.

In her free time she enjoys spending time with her husband. She also enjoys running, hiking, fishing, and hunting, especially upland game with her German Shorthaired Pointer, Greta.

Jessica French, DVM

Associate Veterinarian

Dr. French joined ACVS in June of 2022, after spending one year in practice in Idaho. She completed her pre-veterinary requirements at Montana State University – Bozeman and in 2021 received her Doctor of Veterinary Medicine degree from Iowa State University. 

Dr. French grew up on a small farm in Minnewaukan, North Dakota with many different animals which fostered her love for animals and veterinary medicine.  She has 2 cats, Gizmo and Bobby; 2 dogs, Ringo and Sandi and a horse, Chester.

When not at the clinic Dr. French can be found cheering on the Reed Point – Rapelje Renegades as her husband coaches football and basketball. When she isn’t at football or basketball games she enjoys spending quality time with her husband and daughter.

Anneke Johnson, DVM

Associate Veterinarian – Part Time

Dr. Johnson received her Doctor of Veterinary Medicine from Colorado State University in 2017. Previously, she completed her undergraduate degree in foreign languages as well as her pre-veterinary studies at MSU Billings and in Costa Rica. Born and raised in a small town called Lennestadt, Germany, a string of adventures eventually led her to Montana, where she decided to follow her childhood dream of becoming a veterinarian. She’s enjoyed helping people and their pets of Big Timber since February 2020. She is certified in Veterinary Medical Acupuncture for small and large animals.

Dr. Johnson is married to a Big Timber native and in her free time enjoys spending time exploring the beautiful open spaces of Montana with her family of two- and four-legged family members, some of which have spotted paws. She also loves to ride her horse, play banjo, travel, paint, and read books.

Deb Silverstein

Office Manager/Receptionist


Connie Weston

Receptionist – Part Time


Cheryl Garton

Receptionist – Part Time


Katie Kepford

Veterinary Assistant

Jessie Dulin

Veterinary Assistant


Maddy Stewart

Veterinary Assistant


Cheyenne Smith

Veterinary Assistant

Cheyenne joined ACVS in May 2022. She was born and raised in California and moved to Big Timber in 2021. She grew up loving animals both large and small. Ever since she was a little girl, she knew she wanted to be a veterinary assistant and help animals. 

Cheyenne has enjoyed learning about the veterinary science for both small and large animals. She wants to work towards getting her Veterinary Technician License in the future. 

In her free time she loves to spend time with her family, her dog Sasha, and cat Salem.