Meet Our Doctors in Peoria, IL

Whitney Veterinary Hospital would not be what it is today without the dedication of our hardworking and dedicated doctors and support staff

Nancy J. Hayes, D.V.M., C.C.R.T./Practice Owner

VeterinariansDr. Hayes began as an associate veterinarian at Whitney Veterinary Hospital in 1987. After being a partner for many years, she purchased the practice from Dr. Robert Whitney when he retired. She always knew she wanted to be a veterinarian. As a child, she adopted dogs, cats, guinea pigs, fish, goats, and other needy creatures. In high school, she worked evenings and weekends for their family veterinarian, cleaning cages, floors, and equipment, and assisting in any way he would let her. She never considered another career. Looking back, in addition to her love for pets, she had a desire to bring help and hope to their families, too.

Dr. Hayes attended Lincoln Land Community College (now part of University of Illinois) and continued to work full-time for her family veterinarian. Accepted into University of Illinois Veterinary Medicine program in 1983, she graduated in 1987.

As the practice owner, she mentors the other doctors and enjoys developing all of her staff to their fullest potential. Her special interests are orthopedic conditions, especially fracture repair and TPLO surgeries for repairing a torn ACL. She has advanced training in orthopedic surgery as well as certification in canine rehabilitation therapy. She enjoys diagnostic medicine including radiology, ultrasonography, and endoscopy. She has a soft spot for senior patients, but still needs to snuggle new puppies and kittens whenever possible.

Dr. Hayes shares her home with her mother, Le, and their four dogs. Poppy is their little golden who enjoys snuggling. Morgan is a flat-coated retriever who also enjoys snuggling, playing with balls, and is Nancy’s all-around pal as well as being an occasional blood donor for the hospital. Pebbles and Splash are the youngest of the group, Pebbles loves doing agility with Le. Splash is a frequent visitor to the hospital and loves to brighten our team’s day with her playful personality!

Dr. Hayes has served on many professional boards as well as local clubs. A life- long learner, she attends many regional and national continuing education meetings. She encourages and enables her entire team to do so as well.   

When Dr. Hayes isn’t working she enjoys dog training with Splash, traveling, and quilting. She also loves reading, agility shows, gardening, and photography.


VeterinariansDr. Myers grew up on a swine, cattle and row crop farm in Missouri and also spent time on her grandparents’ farms. Her desire to help all kinds of animals fueled her drive to obtain her Doctorate of Veterinary Medicine at the University of Missouri- Columbia. After graduation in 1998, she moved to Canton, Illinois, where she practiced mixed animal medicine for six years. She joined our practice in 2004 and now practices exclusively with dogs and cats.

Dr. Myers has a special interest in integrative medicine, soft tissue surgery, and has advanced training in dentistry. She is certified in Acupuncture, Spinal Manipulation (Chiropractic), Chinese Herbals, and Food Therapy. She is very passionate about the addition of integrative medicine into our practice and loves to see the successful outcomes for our patients.

Dr. Myers attends many local, regional, and continuing education meetings each year. She was president of the Illinois State Veterinary Medical Association in 2014-2015 and is a member of the Peoria County Veterinary Medical Association, Mississippi Valley Veterinary Medical Association, the American Animal Hospital Association, the American Veterinary Medical Association, the American Association of Traditional Chinese Veterinary Medicine, the American Veterinary Holistic Association, the American Veterinary Chiropractic Association, and the Association of Veterinary Acupuncturists.

Dr. Myers is married to Alan. They have two sons; Conner and Liam, a stepdaughter, Shaylee, and three grandchildren that keep them very busy and active. Their family also includes two Boston Terriers, three cats, a chinchilla, and three horses. She enjoys traveling, reading, running, and outdoor activities.

Michael E. Manthey, D.V.M.   

Veterinarians Dr. Manthey was raised on a cattle and crop farm near Wenona, Illinois, where he had a great appreciation for the work their veterinarian performed. Upon graduating from Peoria Christian School in 1999, he joined the U.S. Air Force. He served as a lab technologist in North Dakota for six years and then as an air traffic controller in Florida for four years. During his military career, he took college classes to achieve his goal of becoming a veterinarian. 

Following his military service in 2009, he pursued a career in veterinary medicine with a bachelor’s degree in biology from Illinois State University. He went on to earn a Doctorate of Veterinary Medicine from the University of Illinois in 2015. Dr. Manthey has special interest in cytology, ophthalmology, endoscopy, and various soft tissue and orthopedic surgical procedures.     

Dr. Manthey is a member of the Peoria County Veterinary Medical Association, the American Veterinary Medical Association, the American Animal Hospital Association, the Mississippi Valley Veterinary Medical Association, and the Illinois State Veterinary Medical Association.

He and his wife, Holly, are avid Cardinal and Illini fans. They have two sons, Nate and Caleb, who both enjoy sports, band, school, and spending time with the family pets: a rescued dachshund mix named Lily and a Brittany named Rory. He enjoys spending time with Holly and their boys, going to University of Illinois sporting events, fishing, traveling, and attending family church activities. 

Amanda Frazier, D.V.M.   

Dr. FrazierDr. Amanda Frazier joined our team in early 2021 as an Associate Veterinarian. Dr. Frazier grew up in East Peoria, IL, went to the University of Illinois for undergrad, and the University of Minnesota for Vet School. She grew up with a house full of pets; a dog, hermit crabs, guinea pigs, hamsters, a hedgehog, and birds!

Dr. Frazier got into veterinary medicine because she had a love for animals; she stays in veterinary medicine because she has a love for helping people. She enjoys challenging medical cases, soft tissue surgery, and anything feline. Dr. Frazier will be continuing on with our Feline Friendly Practice standards. She is a member of the Illinois State Veterinary Medical Association and the American Veterinary Medical Association.

She shares her home with a Border Collie named Gus and two cats; Ollie and Vinny. Dr. Frazier enjoys reading and anything active, including; hiking, biking, kayaking, and running. She likes to participate in triathlons and trail running.

Rachel A Hanley, D.V.M.   

Dr. Frazier

Dr. Rachel Hanley joined our practice in the fall of 2023. Dr Hanley attended Purdue University for her undergraduate studies and earned her Doctorate of Veterinary Medicine from the University of Illinois in 2021.

Dr Hanley joined us with an interest in learning Orthopedic Surgeries, Canine Rehabilitation and furthering her knowledge of Soft Tissues Surgeries. She looks forward to practicing with our high standards of patient care and learning more of our advanced diagnostics and patient treatment options. Dr. Hanley was drawn to our hospital’s mission of constant learning and the team-based mentorship program we provide to our doctors.

Dr. Hanley shares her home with her husband, Piper and Granger the golden retrievers, Ruby and Paisley her very sassy cats, and 30 chickens! She enjoys running with her dogs, gardening, spending time with family and curling up with a good book.