Meet Our Team

Dr. Dennis Sebunya, DVM


Dr. Sebunya grew up in a family that had numerous pets over the years and so he’s always had a love for animals. From a young age, he wanted to work in the medical field and so he decided that becoming a veterinarian would be the best way of combining the two things that he loved (medicine and working with animals). After graduating from veterinary school in 2001, he worked in a mixed animal practice in addition to doing some wildlife work. He then worked in a university research setting before returning to full-time small animal practice.

Prior to joining The Vet’s Animal Hospital in 2011, he spent almost 5 years in small animal practice in Parker and Aurora. While Dr. Sebunya enjoys the variety that comes with small animal practice, he has a special interest in soft tissue surgery as well as dentistry. He is a member of the American Veterinary Medical Association and the Colorado Veterinary Medical Association. Dr. Sebunya is excited to be a part of The Vet’s Animal Hospital because this is a practice that truly makes a difference in the lives of pets.

During his free time, he enjoys bodybuilding, CrossFit, martial arts and playing the guitar. He also enjoys spending time with his wife and two sons hiking, paddle boarding, and enjoying the great Colorado outdoors. Dr. Sebunya has a dog named Tucker who is always up for a good adventure. Tucker was adopted as a one-year-old through the Prison Trained Canine Companion Program.

Jean Sims

Client Services Coordinator

Jean is a Colorado native and has been working at The Vet’s Animal Hospital for over 13 years. She loves animals and tries to love on every pet that walks through the front door. She lives with her husband of 47 years and their 2 furry kids. Hank is a golden retriever that thinks everyone is his best friend and Duck is a lab mix that likes to have the couch all to himself! When she isn’t at the clinic she loves spending time with her family, tending to her flowers, and boating.

Julia Guerrero

Team Lead and Veterinary Assistant

Julia was made in Mexico, but was born in Colorado. Having had a love for animals from a young age, she decided that she wanted to work with them. She started working at The Vet’s Animal Hospital after graduating from Pima Medical Institute in September 2014. She has 2 dogs, Mili and Chente. When Julia isn’t working she likes to be on Netflix, read Harry Potter and be outdoors.

Eduardo Marquez

Veterinary Assistant

Eduardo was born in Denver, Colorado. He developed his love for animals early on after visiting his uncle’s farm in Kansas and helping around whenever he could for many years. Wanting to work with animals, he eventually attended and graduated from Pima Medical Institute. He has one dog named Angelo. During his free time, he enjoys playing video games, listening to music, being with family and friends, as well as spending time outdoors.

Roxana Kujala

Veterinary Assistant

Roxana moved to Colorado in her early childhood with her family. After deciding that she wanted to work with animals, she attended Pima Medical Institute and graduated in 2017. She lives with her husband and two dogs, Max and Oreo. In her spare time, she likes to binge-watch movies, read and play card games.

Jalyn Evans

Veterinary Assistant

Jalyn grew up in Thornton, Colorado. As someone who grew up with many animals, she has always loved being around them and interacting with them. She knew from the age of 5 that she wanted to work with animals and do what she could to help them. After graduating from Thornton High School, she attended Pima Medical Institute to further her education on working with animals. Jalyn has two rescues, a dog named Mocha and a cat named Elvis. She is planning to rescue more animals in the future. When she’s not working she enjoys hiking, watching movies, writing, playing video games, drawing and crocheting.