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Our Doctors

Dr. Michelle L Thomas, D.V.M

Dr. Thomas was born and raised in the Pacific Northwest. Her passion for animals led to a Bachelor of Science degree in Zoology at Washington State University in 1992 followed by a Doctorate of Veterinary Medicine, also at WSU. After graduating with high honors in 1996, she moved to Fort Collins and began working at Mulnix Animal Clinic. She feels very privileged to have had Dr. Mulnix as her mentor, friend and colleague for so many years. She purchased Mulnix Animal Clinic in 2015 and values the compassionate, talented and loyal Mulnix Animal Clinic team and wonderful clientele.

Dr. Thomas continually strives to improve her knowledge and stay on the leading edge to provide you with the latest treatment options. Her ultimate goal is to help educate and guide you through individualized treatment plans that will provide your pet a long, healthy and happy life at whatever life stage they may be in. She has also established a network of trustworthy specialists to consult or refer to when necessary. Her family oriented approach and enthusiastic demeanor is welcoming to everyone. She looks forward to challenging cases and meeting new and old loyal clients every day. Dr. Thomas is a proud member of the American Animal Hospital Association, American Veterinary Medical Association and the Larimer County Veterinary Medical Association.

When away from the clinic, she enjoys time with her family and all of their sporting events. Her daughter, Shelby, is in high school and softball is her passion. Her son, Garet, is in middle school and loves football and baseball. Her husband and high school sweetheart, Mike, has become an avid animal lover too. Her kids enjoy pet sitting and that has taught them responsibility, respect and appreciation of the love and companionship pets offer. When not at a kid sporting event she can be found walking the dogs, snow skiing, playing indoor soccer, reading or with friends.

Her furry family currently consists of "Bean" a rambunctious and snuggly adolescent golden retriever that is still trying to master the art of "retrieving", "Q", a 13 year old lab/border collie Heinz 57 that rules the roost, and 2 shelter kitties: "Duffy" aka 'Duffer Fluffers' a grey tabby and "Twix" the 16 pound 'kitten' that she and her kids came home with from the shelter. They also have various fish and Shelby's 10 year old frog named "Watermellon".

Dr. Kelly Gaffney, D.V.M

Dr. Gaffney is passionate in her work with animals, both big and small. She has been a warm presence of the Mulnix team since 2015. Dr. Gaffney graduated from Colorado State University in 2013. She currently practices both equine veterinary medicine and small companion animals. Dr. Gaffney believes strongly in preventive medicine, educating her clients on the best care for their pets, and building a strong foundation between herself and her clients.

Dr. Gaffney always stays current on the latest treatment and medication options available in veterinary medicine.  She believes that the best standard of care can only be given if we are constantly exploring what new strategies are out there to diagnose and treat our patients. She strives to be compassionate towards fearful pets. She believes a stress-free environment is essential for patients and has many strategies to help anxious furry ones. She considers the Doctor patient relationship a collaborative effort and can tailor treatment plans to suite both client goals and expectations as well as what is in the best interest of the pet.  She takes time to answer questions and explain case details about your pet so that hopefully an understanding of what is going on and what options are available are clear so that confidence can be gained and ultimately pets succeed.   

Since childhood Dr. Gaffney’s passion has been her love for horses. She currently enjoys riding and caring for her own horses; Slew her retired thoroughbred, Hershey her miniature horse, and Abraham her welsh pony. Helping her keep everyone in line are her pack of cattle dog pups. Adelaide, her youngest craziest baby is a bit of a cartoon in motion, hilarious, busy, and somewhat of a clown. Delilah is a little more introverted and challenging, but keeps things interesting with her unique personality. Finally, Berkley, the oldest and wisest of her pack is a gentle, sweet and loyal dog. He has endured a limb amputation and chemotherapy, and is now a cancer survivor for 4 ½ years!

Dr. Gaffney loves to paint and draw using many mediums, and creates mosaics, pottery, and works with stained glass. Moving from South Carolina to Colorado 16 years ago, Dr. Gaffney loves to get back to the ocean when possible, drink sweat tea, and visit her family. 


Office Hours


7:00 am-6:00 pm


7:00 am-6:00 pm


7:00 am-7:00 pm


7:00 am-6:00 pm


7:00 am-6:00 pm


8:00 am-2:00 pm