Meet Our Doctors

Cheryl Pfeffer DVM, CVA                Alison Vanderhoof  DVM, CVA                 Liz Thomas DVM            Kristen Rivers DVM


Dr. Pfeffer_Veterinarian_Practice_Owner.jpgDr. Cheryl Pfeffer

Cheryl Pfeffer  DVM, CVA is a native of Oklahoma. She grew up in the Shawnee area and always knew that she wanted to be a veterinarian.  She obtained her Bachelor of Science Degree in 1990 and her DVM degree in 1995 from Oklahoma State University.  During Veterinary School, she completed an internship in exotic animal medicine at Kansas State University, College of Veterinary Medicine where she had the opportunity to work with two zoos.  After graduation, she and her husband moved to Dallas where she worked with both companion animals and exotic animals.  She came home to Oklahoma in 2005, where she has continued to work with all of the pets that she loves.  She joined the family of Animal Medical and Surgical Hospital in 2010.

She received her Acupuncture certification at the Chi Institute in Florida

Dr. Cheryl Pfeffer loves being able to make a difference in the lives of her patients and their people.  She enjoys working with people and their furry, scaled and feathered family members.  Her special interests are Dermatology, Ultrasound, Endocrinology, Internal Medicine, Orthopedic and Soft tissue Surgery, Feline Medicine, exotic pet medicine, Acupuncture and Herbal therapy.  

Her free time is spent with her husband James, her three children, four dogs and one cat. She enjoys spending time with her family, painting, sewing and gardening. 

Dr. Pfeffer is a member of the American Veterinary Medical Association, the Oklahoma Veterinary Medical Association, the Tulsa County Veterinary Medical  Association and the Association of Avian Veterinarian.


Dr. Alison Vanderhoof

Tulsa Veterinarian Dr Alison Vanderhoof

We are very excited to have Alison Vanderhoof DVM, CVA as part of our AMSH family. She is originally from Texas but moved to the Tulsa/ Broken Arrow area several years ago.  She had a career in banking before she pursued her original dream of becoming a veterinarian. She attended Oklahoma State University for her bachelors degree and her DVM degree.

She is certified in Animal Acupuncture through the Chi Institute in Florida. She also has strong interests in controlling chronic pain, herbal animal medicine, soft tissue surgery, internal medicine, dermatology and exotic pet care.

She spends her time outside of the office with her husband Dustin, dog, rabbit and 2 cats. She enjoys running and OSU football.

Dr Vanderhoof is a member of the American Veterinary Medical Association, the Oklahoma Veterinary Medical Association,the Tulsa County Veterinary Medical            Association and the American Association of Traditional Chinese Veterinary Medicine.


Dr. Liz Thomas

Dr Liz Thomas at Animal Medical and Surgical HospitalDr. Thomas was born in Tulsa.  She graduated from Jenks high school and attended Oklahoma State University for undergrad and for her DVM.

She loves the bond people have with their animals.  "It is so special and unlike any other.  Who else in your life is always there for you, never argues and loves you unconditionally?"  She is passionate about feline medicine, nurturing the bond between people and their pets.  She finds tremendous reward in empowering people to be active and involved in the health of their pets and making a sick pet feel better.

She is married to her high school sweetheart and has one human child.  She also has a few furry babies: Oslo, Heidi and White Foot. Her hobbies are spending time with her family, exercising and going to the beach.


Dr Kristen Rivers

Dr Kristen Rivers

Kristen Rivers DVM is now a part of our AMSH team!  She grew up in a military family.  She spent her teenage years in NW Florida.  Whe earned her Bachelor's degree in Biomedical Sciences and minor in Biomedical Physics at the University of South Florida.  

Dr Rivers and her husband moved to Broken Arrow/ Tulsa area soon after where she started to pursue her dream to become a veterinarian.  She graduated in 2018 from Oklahoma State University College of Veterinary Medicine.  She previously practiced at Bent Arrow Animal Hospital in Broken Arrow.

She has a strong interest in small animals and exotic medicine.  She loves every aspect of veterinary medicine.  She especially loves soft tissue and orthopedic surgery, internal medicine, cardiology, dentistry, ultrasound and reproductive medicine. 

Dr Rivers enjoys spending time with her husband, fishing, hiking and taking their kayaks out on the river.  she spends alot of time with her horse, Marvel.  

She is a member of the American Veterinary Medical Association, Tulsa County Veterinary Medical Association, Association of Avian Veterinarian, Association of Reptilian and Amphibian Veterinarians and the Association of Exotic Mammal Veterinarian

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Location & Hours

Tulsa Office Location

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Office Hours

Monday:

7:30 am-7:00 pm

Tuesday:

7:30 am-7:00 pm

Wednesday:

7:30 am-6:00 pm

Thursday:

7:30 am-6:00 pm

Friday:

7:30 am-6:00 pm

Saturday:

8:00 am-6:00 pm

Sunday:

Closed

Closed

Broken Arrow Office Location

Find us on the map

Office Hours

Monday:

7:30 AM-6:00 PM

Tuesday:

7:30 AM-6:30 PM

Wednesday:

7:30 AM-6:00 PM

Thursday:

7:30 AM-6:30 PM

Friday:

7:30 AM-6:00 PM

Saturday:

8:00 AM-1:00 pm

Sunday:

Closed