Meet Our Veterinarians

Meet Our Doctors

meet_dr_allison_moser_mayo.jpgDr. Allison Moser Mayo

Also a veterinary clinic director and a 1989 graduate of the Virginia-Maryland Regional College of Veterinary Medicine. Dr. Mayo has been with the practice since Jan. 1995. She has been active in animal welfare in the Dale City and Woodbridge communities for many years. She can often be found leading a Cub Scout or Brownie Troop through the animal clinic on an educational tour, having found that kids love to see x-ray evidence of flatulance.  She is a proponent of teaching kids how to care for and love pets, while also learning how to be safe around them. She is an adjunct professor with the Northern Virginia Community College Veterinary Technician program, having mentored two students through their education there.  Dr. Mayo is married to Kevin (NOT a veterinarian!), and has four kids - Nathan, Joe, Rebecca and Gabriel.  Additionally, they have many pets-dogs, cats and birds.  She and her husband have a dream of eventually owning a small farm where they would be able to have goats, sheep and maybe pigs (that they would never eat!).

"Why do I come to work, why do I still love to do this job?  Our veterinary teams at our two hospitals are the best people you can know, and together we make a difference every day.  Whether it's a wellness exam for a new kitten, an emergency weekend surgery on an ill dog, or a school visit to teach kids (and teachers) about our amazing profession, every day holds a new challenge and a new reward."

Dr. Heather Hurst

Dr. Heather Hurst earned a B.S. in agriculture and animal technology at Murray State university in Kentucky in 1998 and her DVM with honors from Auburn University in Alabama in 2002. She has been with the Gunston practice in Lorton since June of 2003. Dr. Hurst's special interests include internal medicine and surgery, and she has 5 cats, 3 dogs, and 1 bird.


Dr. Malia Coppage

Dr. Coppage, her husband Clay (who proudly serves in the Air Force), her two dogs, Trickseigh and Mariah, joined us from North Carolina.  She and Clay welcomed their first daughter, Kate, in July 2019.

She grew up in Indianapolis, Indiana.  She completed her undergrad at Purdue University and attended veterinary school at North Carolina State University where she received her doctorate in veterinary medicine in 2013.  She has completed two veterinary internships: a rotating internship at Wheat Ridge Animal Hospital in Colorado and a specialty Internal Medicine/Critical Care internship at Gulf Coast Veterinary Specialists in Texas.

Dr. Coppage brings to the Dale City team an enthusiasm for internal medicine, dermatology, surgery, and preventative medicine.  She also demonstrates the high level of compassion and quality care that Dale City Animal Hospital is known for. In her free time, she enjoys spending time with her dogs and family, watching movies, and traveling.

meet_dr_judi_vinch_1.jpgDr. Judi Vinch

Dr. Vinch has always had a love of animals and a love of science and found that Veterinary Medicine was the perfect blend of both.  Dr. Vinch earned her Bachelors at Bowling Green State University and then went on to graduate with her DVM from The Ohio State University in 1996.  After working in Columbus, Ohio, Dr. Vinch and her family relocated to Northern Virginia in 2004.  She worked for 7 years at Sacramento Veterinary Hospital before joining our Gunston veterinary hospital team in July 2011.  

She places a strong importance on the special bond that our clients and their pets have.  About her goals for each visit she says, "I want every client to feel that they have been heard and that their pet has been valued as if we were treating our own."  Her special interests are feline medicine and surgery and dentistry.  

Dr. Vinch and her husband, Jim, make their home in Woodbridge with their son, Golden rescue Ace, their cat, Midge, and their guinea pig, Cinnamon.

meet_dr_patty_katz.jpgDr. Patty Katz

Dr. Katz joined the animal clinic staff in June 1996.  She is a 1994 graduate of Virginia-Maryland Regional College of Veterinary Medicine.  She is a familiar face to many of our clients who stop by on the weekends and is loved by clients and staff for her great sense of humor!

Dr. Katz was inspired to go into the field because she grew up with pets and always had a strong interest in medicine.  SHE loves coming to work because of the people she gets to interact with, both staff and clients.  Her love of  pets and people carries over into her hobbies; she has been doing work as a volunteer at Northern Virginia Therapeutic Riding Program (NVTRP) where she works with amazing horses and handicapped individuals.

She is married and has a son and a daughter, a Russian Tortoise named Milo, and two dogs and two cats named after the Peanut characters:  Linus (cat), Charlie Brown (cat), Snoopy (dog), and Lucy (dog).  She also enjoys yoga and Moth Story Slams.


Dr. Justin Odom

Justin Odom is proud to be joining such a talented and kind team of veterinarians and staff members. He was born and raised in Florida where he received his first degree from FAU’s honors college. He then spent a year in upstate New York by the finger lakes. Finding that the coldest Ithaca winter in its 122 years of records did not agree with his Florida blood, Justin moved to the famously sunny United Kingdom where he graduated from the Royal Veterinary College.

In his spare time, Justin enjoys riding western, crafting and hiking. He looks forward to adopting a new dog towards the end of summer to make his house feel like a home. Until then, he will make do with his fish tank.

Dr. Mary Galloway

Dr. Mary Galloway has been associated with our veterinary hospitals since 1995, and currently is a relief veterinarian for us. She has had a long history of involvement with companion animal training and canine reproduction, initially as a successful obedience competitor and later as a breeder of Shetland Sheepdogs (Shelties). Prior to and during veterinary school, she worked as a companion animal trainer.  She is also the owner of Fairhill Veterinary Services, providing reproduction and behavioral counseling.  


Dr. Maria Guerrero-Reyes

Dr. Guerrero-Reyes earned her Doctorate of Veterinary Medicine (VMD) from the University of Pennsylvania School of Veterinary Medicine in 2020 and is excited to be joining the fantastic team of compassionate veterinarians and staff at Gunston & Dale City Animal Hospital. She has special interests in internal medicine and ophthalmology. 

Dr. Guerrero-Reyes is also fluent in Spanish. Dr. Guerrero-Reyes was born in Buenos Aires, Argentina and raised in New Jersey. She received her Bachelor of Arts in Slavic Languages & Literatures at Princeton University in 2008 and then went on to complete a Master of Arts in Slavic Linguistics at the University of Chicago. Prior to veterinary school, she worked as a veterinary assistant in Rochester, NY and Northern Virginia. 

Dr. Guerrero-Reyes and her husband, Richard, live in Woodbridge with their beagle Biscuit and their 3 cats (Rosemary, Pancakes, and Maude). She makes the best empanadas and enjoys baking, learning new languages, music, and arts & crafts.

Our Licensed Veterinary Technicians

Michele Booth, LVT - Clinical ManagerMichele

Michele Booth graduated from Northern Virginia Community College in 1987, receiving her A.A.S. in Veterinary Technology.  She has been with the Gunston Animal Hospital practice since October 1998 and is now the Senior Veterinary Technician and Clinical Manager.  Michele has a special interest in anesthesia and dentistry.  She also participates with many continuing education opportunities and loves improving her veterinary knowledge and skills.

Her interest in this field stems from a love of animals that has been present since she was a young child.  She got her start in veterinary medicine while in high school working as a Kennel and Veterinary Assistant, this is where she learned of the position of Licensed Veterinary Technicians.  What Michele loves the most about Gunston and Dale City Animal Hospitals is the high level of care and medicine practiced.  She also loves her work family and spending time with her coworkers.

In 2017 Michele married Brad who she shares three beautiful daughters with, Kelsey, Kaitlin, and Kelly.  They also share their home with her three cats and three dogs, Ruby the Great Dane, Buster the Cavachon, and Cinnamon the Peekapoo.  She has a special affinity for Great Danes and loves horses, horseback riding at Meadowood Stables, loves to bake, and loves the beach.

meet_andrea_tiede_lvt_1.jpgAndrea Tiede, LVT - Clinical Manager

Andrea Tiede started working as kennel attendant at Dale City Animal Hospital in 1997.  After a few months, she quickly became a veterinary assistant. Andrea had always wanted to be a veterinarian. After working at the hospital for awhile, she decided that she preferred nursing over becoming a doctor. She decided to pursue becoming a licensed veterinary technician after graduating high school. She graduated from Hylton Senior High School in 1999 with an advanced diploma. After high school, Andrea went to Northern Virginia Community College and received her A.A.S. in Veterinary Technology in 2002. Andrea is the senior licensed veterinary technician and clinical supervisor at Dale City Animal Hospital.

Andrea married Joshua Tiede in October 2003. They live in the Manassas area with two dogs and 2 cats.  They now have 2 beautiful daughters, Hannah and Hailey.


Stephany Pizarro, LVT

Stephany has lived in NOVA her entire life.  She began working at Dale City Animal Hospital while in Tech School, after shadowing the doctors and staff for experience.  During her Internship she also began to work at the Gunston location, where she now primarily works.  She thought she wanted to be a veterinarian until she was introduced to the LVT field.  She has had a passion for working with pets since a young age.

What she loves the most about her job are the hands on duties she completes as an LVT and has a special interest in dentistry.  She loves the family friendly atmosphere at our practices and enjoys getting to know all of our clients and helping them care for their pets.

Not only is Stephany a Licensed Veterinary Technician but she is also a Certified Dog Groomer and Fear Free Certified since 2016.  Her Fear Free Certification means she takes special care to relieve fear or stress any patient may be experiencing while visiting an unfamiliar environment.  Stephany married in 2016 and she and her husband's pets are all former Have-a-Hearts.  She likes to bake more than cook and will sometimes bake a variety of dog treats.

Brandy Fabre, LVT

Brandy has been a valuable part of Gunston and Dale City Animal Hospitals since 2010 when she started as  a Kennel Assistant.  From the start, she was meticulous in her care with our boarders and we were excited to watch her grow into her current role of Licensed Veterinary Technician.  She graduated from NOVA's LVT program in 2018 and we are proud to announce that she passed her VTNE in July of 2018.  She has a growing interest in dentistry and dental radiographs are one of her favorite things!

She was inspired to continue in the field not just because of her love of animals, but also because of the people she works with.  She feels fortunate to have been mentored by Dr. Mayo and Andrea Tiede who pushed her to pursue her talent for veterinary medicine.  Their guidance helped her realize this is where she was meant to be.  She considers the staff her second family who support each other in every endeavor.

Her family has three dogs with Finley being her own rescue pet.  She loves the beach and exploring new placed, Emerald Isle is her favorite.  Brandy loves to draw in her free time, especially wolves.  Her other cherished pastime is napping!  Because wolves are her favorite animal her dream job after she retires would be to volunteer at a wolf sanctuary or possibly help track packs.

Ashlynn Stack, LVT

Ashlynn stayed on with us after shadowing at Dale City Animal Hospital, she has been an important part of our family since 2013.  She splits her time between both locations.  She earned her License as a Veterinary Technician in 2018.  She is also Fear Free Certified and has a Bachelor's degree in Animal Science from the University of Maryland.  She has always had dogs and cats since she was young and enjoyed being around animals.  Her pets have brought her family a lot of joy so she knew she wanted to be involved in helping them in any way possible.  What Ashlynn loves about Gunston and Dale City Animal Hospitals is the interaction all of her coworkers have at each hospital; she truly feels we are a work family.

She has four older brothers so she enjoys watching and playing sports.  In total, they have five cats and two dogs, including three Have-a-Heart brother cats.  Her dream is to run her own rescue/sanctuary for animals of all kind in the future.

Our Veterinary Assistants


Bonnie Buning, Veterinary Assistant Supervisor

Bonnie joined the Gunston and Dale City Animal Hospital family in 2012 and quickly became the resident cat whisperer and has fostered several kittens through our in-house adoption program, Have-a-Heart.  She is also responsible for guiding our Veterinary Assistants and helps ensure that we continue the high level of care that we strive for.  Bonnie has a Bachelor's in English with a concentration in Creative Writing.  She is also Fear Free Certified and is currently in the Veterinary Technician program through Penn Foster.

Bonnie's inspiration is her childhood cat who was diagnosed with cancer.  During her cat's illness she learned patience, how to observe, and comfort when needed the most.  The experience made her realize how much she cared for animals and the love that she is able to share with patients who need help.  She loves working for our hospitals because she enjoys the learning environment and experiencing something new every day.

She lives with eleven cats and is proud to be a crazy cat lady!  She loves all types of crafts and the color purple.  If you've visited our hospitals you have likely seen her crafts up front which she makes to benefit our Have-a-Heart program.  She also has a "small" obsession with vampires and Celtic lore; she can nerd out wicked hard at a moment's notice.

MadeiraMadeira DeGarmo, CVA

Madeira came to us after completing an externship at Gunston Animal Hospital through the Animal Behavioral College where she earned her certification as a Veterinary Assistant.  During her externship she demonstrated the kind of compassion and care that our hospitals value for our patients.  We were lucky to have her accept our offer to stay on as an official member of our family.

She has always had a love for animals and while watching Animal Planet she saw a commercial about becoming a Veterinary Assistant and thought it sounded like a good fit for her.  She says she has never regretted her choice and loves helping animals!  Besides helping animals, she loves who she works for and with.  She enjoys coming to work each day because everyone gets along so well.  She felt our family welcomed her with open arms and she loves it here (and we love her!)

Madeira has a Bearded Dragon named Earl, and also shares her home with her daughter's dog, Leonidas.  She is a motorcycle enthusiast and rides her bike to work most days.  If she's not helping animals, she's on her bike.  Madeira speaks German.  She was in the German Exchange in High School and lived there for three years.

Paty Patricia Flores

Paty got her start at Dale City Animal Hospital as a Kennel Assistant.  She continued to seek out more responsibility and knowledge and is now a familiar face to many as one of our Veterinary Assistants.  She is a 2017 graduate of Hylton High School and has aspirations to pursue a degree in veterinary technology as she is inspired by the great Licensed Veterinary Technicians she works with at DCAH.

She first gained interest in working in the veterinary field because her two dogs.  They taught her how to love animals and she wanted to share that love with other pets, sick or well.  She has a strong desire to help care for pets and to keep them healthy.  Prior to working in the field she wanted to become a hairstylist and has a cosmetology license by changed her dreams after finding that she loved the veterinary field.  She enjoys the work environment at our hospitals and loves seeing cute, adorable pet faces each day she's here.

Paty has Mexican and Salvadorian roots and was raised in Woodbridge.  She is the baby of the family and has two Chihuahuas, Speedi and Daisi, who are her whole world.  She's a big fan of the Greenbay Packers, Washington Wizards, the shows Friends and The Office, she is fluent in Spanish.  She will also choose Pepsi over Coke any day.

Katie Michel

Katie has been a Veterinary Assistant at Gunston Animal Hospital since 2018.  Katie wanted to join our field because she loves all kinds of animals, cats, dogs, reptiles, and rodents.  In fact, she is the proud owner of two cats, two dogs, three snakes, and a very smart goldfish.  She has enjoyed working at GAH because of the learning environment.  Several of our staff members enjoy education and team building and Katie feels she has benefited from that.  She is taking this love of learning and animals and is currently enrolled in a Veterinary Technician program.  She really enjoys drawing and you may have seen her artwork in the form of face painting at some recent community events that Gunston and Dale City Animal Hospitals participated in.

Daijah Rodriguez

A Veterinary Assistant with Gunston Animal Hospital since 2017, she was invited to join our team after shadowing at Dale City Animal Hospital.  She impressed our team with how gentle and kind she was with our patients.  She's known that she wanted a career that dealt with the care of animals since she was young, she has always loved them.  Daijah loves being able to learn something new every day and especially loves being able to care for patients and provide them comfort while in our care.  She is currently in school to become a Licensed Veterinary Technician.

Daijah shares her home with her two dogs, Karma and Kale.  She loves nature, elephants, giraffes, and grew up a "military brat".

Our Client Care Coordinators

Marianna Marianna Langenbeck

One of our Gunston Animal Hospital Client Care Coordinators, Marianna has been a smiling and friendly face at our front desk since 2016.  She has always had a love of animals and grew up with them and they continue to be a big part of her life.  Prior to coming to the veterinary field, she worked for PetSmart and she knew that she wanted to continue working with pets.

Marianna loves coming to work every day because she feels her coworkers are like a small family.  She also appreciates building strong relationships with our clients and seeing how much people care about their pets.

She has an adorable two-year-old daughter who already loves animals.  She also shares her home with two dogs.  She is left handed and her favorite animals are elephants.

Grace Mendoza

Grace, a very skilled Client Care Coordinator brings with her a talent for organization and is very detailed oriented which helps keep Gunston Animal Hospital running smoothly.  She has a big place in her heart for animals and enjoys advocating for them.

What she looks forward to when coming to work are the staff pets, spending time with Chauncy the hospital cat, seeing her work family, and watching how much our clients love their pets.  Grace enjoys spending time with her playful kitten, nature walks, and goes to pet stores for fun.  She also outgrew a cat allergy by working at Gunston Animal Hospital, her favorite meal is Mac and Cheese, and her favorite animal is an Alpaca.

Our Administrative Team

Lisa Lisa Larsen, CVPM - Hospital Manager 

Lisa has been with our veterinary hospitals since the spring of 2011 and has held a variety of positions between our two locations before taking on the role as Practice Manager in 2013.  Her lifelong love of working with animals found her working as a Kennel Attendant, Zookeeper's Assistant, Veterinary Assistant, and Anesthetic Assistant for several years before finding her home with us at Noah's Ark Animal Hospitals.  In the past, she also volunteered at shelters and in human healthcare with therapy animals where she realized she loved the positive impact the human-animal bond can have.  She comes to work each day excited to spend time with her work family, the clients, and pets.  She is inspired by her compassionate coworkers and strives to provide the support they need to continue their important work.

Lisa is a member of the Society for Human Resource Management, the Veterinary Hospital Managers Association, and earned her title of Certified Veterinary Practice Manager in 2018.  She is originally from Nebraska where she attended the University of Nebraska - Lincoln before moving to the Northern Virginia area.  She and her husband, Luke, share their Montclair home with a lively collection of Shiba Inus, cats, Chiweenies, and one super energetic Dachshund.  Several of her pets were adopted through the Have-a-Heart program where they were cared for by the staff at each hospital before being healthy enough for adoption.

Office Hours

Our Regular Schedule

Gunston Animal Hospital


7:30 am-6:00 pm


7:30 am-6:00 pm


7:30 am-7:00 pm


7:30 am-7:00 pm


7:30 am-7:00 pm


7:30 am-3:00 pm


Open - Hours Vary, Call for Appointment Times

Dale City Animal Hospital


7:30 am-8:00 pm


7:30 am-8:00 pm


7:30 am-6:00 pm


7:30 am-8:00 pm


7:30 am-7:00 pm


7:30 am-3:00 pm


7:30 am-3:00 pm


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