Our Veterinarians

The Riverview Animal Hospital team of skilled veterinarians welcomes you to our practice. Proudly serving the Durango area. At Riverview Animal Hospital, it is our daily privilege to provide quality vet care to your cherished pet, with compassion and competence. We hope to ensure a positive impact on our patients, pet owners and the local community.

The Riverview Animal Hospital Doctor Team


Shannon Mazur, DVM

Dr. Shannon Mazur joined the Riverview Animal Hospital staff as the directing veterinarian of the emergency and critical care service in June 2010. Dr. Mazur received her Bachelor of Science degree from Fort Lewis College while working as a technician here at Riverview, and attended veterinary school at Colorado State University where she graduated with honors in 2009. Dr Mazur became the managing veterinarian in 2015. Dr Mazur enjoys all aspects of veterinary medicine (especially giant breeds, emergency and internal medicine, and ophthalmology). Dr. Mazur enjoys spending time outdoors hiking and skiing, cooking, and listening to music with her husband, 2 young children, dog (and kitty).

Dr. randy hays

Randy Hays, DVM

Dr Randy Hays joined Riverview Animal Hospital in 2005. He moved to Durango after practicing in Ft. Morgan, Colorado. Dr. Hays graduated from Colorado State University with a bachelors degree in Animal Science in 1998 and a Doctorate in Veterinary Medicine in 2003. He is also a Certified Veterinary Acupuncturist. Dr. Hays enjoys living in Durango and being outdoors with his wife and 2 daughters.


Jessica Brooks, DVM

Dr. Jessica Brooks grew up in Midland, Michigan, and graduated from Michigan State University College of Veterinary Medicine in 2007. She practiced at a big clinic in Santa Fe before moving to Durango in 2010. Dr. Brooks loves the variety in veterinary medicine, where she can see everything from a healthy kitten or puppy, to performing a complex surgery, to dentistry, to hospice care, all in the same day. She also loves the long term relationships formed with clients and their furry family members. She is a member of the AAFP (American Association of Feline Practitioners) and heads Riverview's Feline Task Force. At home, she loves being a mom and spending time with her family in the mountains. She has three cats (Jinx, Charm, and Spell), and one adorable dog (Bristow).


Karen Nollet, DVM

Dr. Karen Nollet graduated from the University of Wisconsin-Madison in 2013. Although she's originally from Wisconsin (Go Badgers!), she's lived in Colorado for the past 4 years and loves the mountains. Dr. Karen has a special interest in cat and dog behavior challenges, internal medicine, geriatric medicine and dentistry. She loves working closely with pet families to make sure their furry family members have the best quality care. When Dr. Karen isn't working, she loves hiking in the mountains with her husband and young son. She shares her home and heart with Gordy (pictured), Francios The Cat, 2 horses and 2 mini donkeys.


Shawn Clark, DVM

Dr. Shawn Clark is originally from Atlanta, Georgia and is a 1998 graduate of The University of Georgia College of Veterinary Medicine. Dr. Clark has practiced as both a general practitioner and a emergency and critical care veterinarian in North Carolina, Washington State , and most recently Bozeman, Montana.

From a young age, Dr. Clark has always had a strong natural affection for all types of animals, be it dogs, horses, or even smaller furry creatures that have been part of his family over the years! He appreciates the human-animal bond and feels strongly in fostering this with each and every patient he sees. It is his goal to make every patient’s veterinary visit as stress free and happy as possible. Dr. Clark has a strong interest in both emergency medicine as well as soft tissue surgery and is always very committed to providing the highest quality of care for his patients.

When not working, Dr. Clark loves being outside, cross country and backcountry skiing, hiking, trail running, and mountain biking. His highest priority is always any activity that can be joyfully shared with his two dogs! Dr. Clark, his wife and daughter have a plump and healthy guinea pig, a very affectionate Jack Russell/Chihuahua mix, and a super energetic and enthusiastic Border Collie.