Meet Our Veterinary Team

Meet the staff and medical professionals at Deer Grove Animal Hospital. We consider it an honor to provide your dogs with excellent veterinarian care!


We just focus on taking care of your pet! We’re anxious to get to know you, so we hope you’ll scroll down
and take some time to get to know us.

Our Doctors

Dr. Mark Flahaven

Dr. Mark Flahaven has worked at Deer Grove Animal Hospital since December 2013. He purchased the clinic in October 2015. In the seven years prior, he worked for a corporate practice at various locations throughout the Chicagoland area. He graduated from the University of Illinois, College of Veterinary Medicine in 2006. He is a member of the American Veterinary Medical Association and the Chicago Veterinary Medical Association. Dr. Flahaven is a Fear Free certified practitioner. His love of animals developed at a young age while spending time at his grandparent’s farm in southern Illinois. He spends most of his time with his wife Sarah and children, Charlotte, Violette, Margaret, and William. He also has several four-legged family members, two pugs named Kiki and Stinks, a basset hound named Lumpy, and cats named Moonie, Dweebs, Lil Cat, and Callie.

Sarah Flahaven

Sarah Flahaven grew up in and around Cincinnati, Ohio. She grew up around all kinds of animals: cats, dogs, chickens, goats, and rabbits. Living in a rural area, she showed goats at the 4-H fair and loved raising different kinds of animals. She has a special place in her heart for beagles, as she had four pet beagles as a child. After moving to Chicago, she graduated from Loyola University Chicago with a bachelor’s degree majoring in criminal justice. She also obtained her paralegal certification and worked for a while as an investigator. After meeting and marrying Dr. Flahaven, she decided to change her career path and dedicate her life to helping him and the pets at Deer Grove Animal Hospital. It has been the most fulfilling career path thus far and spending time with the animals is the best reward. She spends most of her free time with her children Charlotte, Margaret, Violette, and William and her fur babies: Lumpy, Kiki, Stinks, Dweebs, Callie, Lil Cat, and Moonie. She is a Fear Free certified veterinary professional.

Colleen Swanson

Colleen Swanson became part of the team in the Summer of 2018. She has two cats; Gizmo and Gus who demand food and likes to sit on her puzzles while she is working on them (the puzzles, not the cats). Colleen has always had a love for animals from a young age, especially cats. After high school, Colleen got a job at her local pet store where little did she know, her future employers were working in the same building. In her free time, she enjoys going to concerts and Sudoku.

Vickie Loranca (Assistant)

Vickies has been working at Deer Grove Animal Hospital for about 5 years. She has two dogs: Ruby, a cairn terrier, and Sadie, a chihuahua/dachshund mix. When she is not working, she loves to walk her dogs, read, and spend as much time with her grandchildren as possible.

Janeth Beltran

Janeth Beltran became part of the team in October 2021. She is currently enrolled in nursing school but has always had a love for animals. In her free time, she enjoys bird-watching with her orange and white cat, Oreo.