Independent. Family Owned. Family Operated.

Treating Animals with Love and Care for More than 20 Years

Since 2002, the veterinarians and staff at Union Veterinary Clinic have been providing personalized care for small animals. Because we are a family-owned and operated, independent animal hospital, your pet will always receive top-quality medical care with plenty of loving attention.

Our Services

We are a full-service, small animal veterinary clinic providing comprehensive medical, surgical, and dental care. We also have an in-house pharmacy and laboratory providing a variety of tests, including digital x-ray.

The Neighborhoods we Serve

You are, of course, welcome to travel to our clinic, but most of our patients come from the neighborhoods near Union Station, including:

  • Capitol Hill
  • H Street Corridor
  • Atlas District
  • The Navy Yard
  • NOMA

The Doctors of Union Veterinary Clinic

Dr. Allison Gross

Hospital Director

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Dr. Gross grew up in Pittsburgh, PA. After graduating from Ohio State University College of Veterinary Medicine, she moved to Washington DC. She completed an internship at Friendship Hospital for Animals. After completing the internship she stayed on as a staff veterinarian there. She worked as a relief veterinarian throughout the DC area after leaving FHA, but has been established as a full-time veterinarian here since 2007. She is our Medical Director at UVC. She lives with her husband Ry, daughter Matilda, son Leo, dog Rooney and cat Sparkles.

Dr. David Massre

Assistant Medical Director

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Dr. Massre’s roots lie in the sunny town of Cooper City, Florida. He embarked on his academic journey at the University of Florida, where he pursued both his undergraduate degree and veterinary studies, proudly earning the distinction of being a ‘double gator’ upon his graduation. During his time in school, he cultivated a deep fascination for preventive care, as well as internal and emergency medicine.

Outside the world of veterinary medicine, Dr. Massre’s passions include hiking and immersing himself in captivating landscapes, often accompanied by his cherished canine companions, Marshall and Mango. One of his cherished dreams is to explore every national park across the United States.

Dr. Booris Yim

Director of Surgery

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Dr. Yim grew up in California and earned his Doctor of Veterinary Medicine degree from Louisiana State University School of Veterinary Medicine in 2011. He practiced as a full-time veterinarian in North Carolina for more than five years before relocating to the Washington, DC metro area in 2016.

After moving to the area, Dr. Yim worked for four years as a full-time relief veterinarian at hospitals throughout Maryland and Washington, DC, including Union Veterinary Clinic, before officially joining the team as a full-time associate veterinarian.

He has special interests in ophthalmology, dentistry, cardiology, and soft-tissue surgery. Prior to veterinary school, Dr. Yim earned a Bachelor of Science degree in Biological Sciences and Dairy Science, as well as a Master’s degree in Agriculture with a concentration in micro and molecular biology from California Polytechnic State University, San Luis Obispo.

Outside of the clinic, he enjoys practicing the clarinet and experimenting in the kitchen as an aspiring home chef.

Dr. Sydney Slottje

Associate Veterinarian

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Dr. Slottje hails from Upstate New York, where she completed both her undergraduate and veterinary degrees at Cornell University. During her studies, she developed a passion for soft tissue surgery and neurology. Now, as a general practitioner, she is thrilled to integrate these specialties with preventative care.

Outside of the clinic, Dr. Slottje loves spending time with her husband, especially while checking out new and local restaurants. She’s an avid reader and home cook, enjoys traveling, and is excited to fully explore everything DC has to offer—including her quest to become the Nationals’ #1 fan.


Practice Manager

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Max’s journey in veterinary medicine began right here in DC at Palisades Veterinary Clinic, where he started as a customer service representative. Since then, he has taken on a wide range of assistant and administrative roles, always guided by his love for animals and dedication to exceptional client care.

Beyond the clinic, Max has devoted nearly a decade to volunteering at the Smithsonian National Zoo’s elephant house, further deepening his connection to animal care.

When he isn’t leading the team at Union Vet, you can often find Max hiking alongside his Hound-mix, Troy — a loyal adventure buddy always ready for the next trail.


Veterinary Technicians

Antonio Perry

Technician Supervisor

Johnathan Ranga

Technician Supervisor

Aaron Carrington

Camille Nell


Veterinarian Assistants

Maikel Johnson

Melany Ruiz


Client Service Representatives

Katie Saunders

Kia Johnson

Rebecca Green


Maddux Pelusa Pantalones

Clinic Supervisor Cat

Maddox patrolled the halls of UVC from 2014 until the summer of 2025. Known for sneaking food, shredding toilet paper, and chasing ankles, he will always hold a special place in our hearts.

In his memory, donations to the Julie Fund help pets and clients with limited resources receive discounted or no-charge exams, treatments, and medications.

A Tribute to Our Former Owner, Dr. Julie Giles

The Julie Fund is a memorial tribute to the former owner of Union Veterinary Clinic. Dr. Giles passed away on February 11, 2009 due to complications from multiple sclerosis. She possessed a deep love for all animals and the practice of veterinary medicine.

Julie had a special place in her heart for kittens and cats, and she spread that affection, influencing many others to feel the same.

Monetary gifts donated to the Julie Fund will be used to help clients and pets with limited resources. These animals will receive discounted or no-charge examinations, treatments, and/or medications.

The Julie Fund is a registered 501(C)(3) through the Veterinary Care Foundation. All donations are tax-deductible. You can mail a check (payable to “Union Veterinary Clinic” with “Julie Fund” on the memo line) to the address at the bottom of this page or call us to donate using a credit or debit card.

We thank you for your support and know that Julie would be so happy to see the assistance we can offer to animals in need.

To avoid confusion please be sure to click the ‘Donate to Julie Fund’ option on the “Billing” page. Thanks!