Our Practice

We are a full-service animal hospital providing comprehensive pet healthcare services in Flower Mound, TX. Our veterinarians offer a wide variety of medical, surgical, and dental services. Our hospital has advanced equipment and technologies, including comprehensive in-house testing for accurate diagnosis, digital x-ray, surgical suites, dental suites, and a pharmacy. We are committed to providing quality care at every stage of your pet's life. From routine preventive care to early detection and treatment of a wide range of conditions and diseases, we have the expertise to provide the highest standard of care for your pet. We also serve Grapevine, Lewisville, Bartonville, Highland Village, & Coppell.

  • Dr. Lynn Dumas

    Chief of Staff + DVM

    Dr. Dumas was born in St. Louis, Missouri, and eventually moved to the East Coast growing up in New Jersey. She received her Bachelor’s degree in Biology with a Minor in Chemistry from Prairie View A & M University in Texas, and her Doctorate degree from Auburn University College of Veterinary Medicine in 1998. The first 10 years of Dr. Dumas’ career was spent in the Home of the Blues, Memphis, Tennessee, where she worked as an associate Veterinarian in private practice, and as an ER Veterinarian part-time. In 2008 Dr. Dumas relocated to San Antonio, Texas for a career opportunity as Chief of Staff at a busy, high volume small animal hospital where she worked for 5 years. In 2013 Dr. Dumas took advantage of an opportunity to work as a mobile Veterinarian traveling around the San Antonio area performing house calls and full service Veterinary Medicine on a fully stocked mobile LaBoit Veterinary Unit. For 5 years she served the pet families of San Antonio, offering full service comprehensive preventative and surgical care. She has many adventurous stories she can share with you about her time as a Mobile Veterinarian!

    In 2018 Dr. Dumas relocated to Flower Mound, Texas, which she is proud to now call home. She initially worked as an associate veterinarian, and then promoted to Chief of Staff at a high volume, high quality medical care veterinary hospital. In 2021 she took advantage of an opportunity to join the wonderful veterinary family at Cross Timbers Animal Medical Center, and was hired as the new Medical Director. She is excited to lead this wonderful, skilled and compassionate team, and to ensure that every furry family member receives excellent quality medical care at each visit. Client communication and client education is something that Dr. Dumas is passionate about! She looks forward to exceeding your expectations every day.

    Dr. Dumas lives in Flower Mound with her husband, Claude and their two children. Their beloved pet family include a Chiweenie, Averie Rose, a Shorkie (Shih Tzu/Yorkie mix) Jackson, their kitty, JoJo Atticus, a female betta fish, Sunny and an African Dwarf frog, Poppi (the children named the aquatic pets!) Outside of work, Dr. Dumas is on the go with her busy & active children. She enjoys going on long walks with Jackson and Averie, experiencing adventures with her husband and friends, working out, and getting lost in many good books. She can also be heard screaming during NFL and NBA season as she is a huge fan of basketball and football.

    Dr. Dumas looks forward to serving this community for many years to come as a family Veterinarian who will treat your pets with the same standard of care she would give her own pet family members. She looks forward to meeting all of the wonderful CTAMC pet parents, and continuing to cultivate the human-animal bond!

  • Dr. Dena Hartley-Lock


    Dr. Lock was born in Minnesota and while growing up, lived in Michigan, Wisconsin, Nevada, Texas and Tennessee. She received her Bachelor’s degree in Animal Science from the University of Nevada, Reno. She then worked in the veterinary field as a technician for 4 years while applying to veterinary school. She received her Doctor of Veterinary Medicine degree from the University of Tennessee, Knoxville. Her love of college football and the Tennessee Volunteers began here! During her time at Tennessee, she also realized her affinity for feline medicine and was the president of the student chapter of the American Association of Feline Practitioners for 2 years.

    After graduation, she worked for a nationally recognized feline practitioner for 2 years before joining Cross Timbers Animal Medical Center in 2004. She truly enjoys that this has allowed the diversity of getting to work with dogs, in addition to being able to continue her passion for cats. She is proud of the fact that Cross Timbers became a fear-free certified hospital in 2018. The entire staff works hard to provide a stress-free environment for all pets that have the pleasure of caring for. A future goal is to become ABVP certified in feline medicine. She is USDA accredited and has experience in international pet travel and helping clients who are traveling or moving overseas with their pets.

    Dena and her husband, Bevin were married in 2006 and in 2011, they had their daughter Zealyn and in 2012, their daughter Tinzley. The girls keep them active with gymnastics classes and they love attending school in Lantana where they also reside. The family loves to travel and they find as much time as possible to go to New Zealand where Bevin’s family lives and he grew up. They share their home with multiple felines and their dog, Tenny (Tennessee).

    Dr. Lock loves working with and getting to know patients and clients and forming bonds with them. She considers her clients and the staff at CTAMC her extended family.

    Member, American Association of Feline Practitioners
    Member, American Veterinary Medical Association
    Member, Texas Veterinary Medical Association

  • Dr. Ryan Galat


    Dr. Galat was born in Ft. Campbell, Kentucky and lived in Michigan for a few years before relocating to his hometown of The Colony, TX. Following high school, Dr. Galat spent four years as a security forces officer in the United States Air Force where he was stationed in England, San Antonio, and North Dakota. He received his Bachelor’s degree in Animal Science in 2019 and his Doctorate of Veterinary Medicine in 2023 from Texas A&M University.

    Dr. Galat has held a lifelong love of animals and has always found a way to work alongside them- from helping train military working dogs in the UK, to working as a veterinary technician for four years, to volunteering at various animal rescue/humane societies. As a new graduate, Dr. Galat’s veterinary interests are vast with particular emphases in areas including soft tissue surgery, dentistry, pain management, senior pet care, integrative medicine, and incorporating exotics (especially rats!) into his practice. He is a member of the American and Texas Veterinary Medical Associations and is certified in Fear Free veterinary techniques.

    Dr. Galat believes that client relationships and education are extremely significant aspects of veterinary medicine in order to ensure the best possible advocacy and care for the pets we hold so dear. He is excited to get plugged in at Cross Timbers AMC to help serve the community to the best of his ability. He has recently relocated to Flower Mound alongside his miniature Australian Shepherd best buddy, Quinn.

    Outside of veterinary medicine, Dr. Galat enjoys reading, writing, the Dallas Mavericks, exercising, live music, kayaking, LEGO, and spending quality time with family and friends (but mainly with Quinn).

  • Dr. John Harvey

    Relief Veterinarian

    Dr. Harvey was born in Metairie, Louisiana. He received his degree from the University of Florida College of Veterinary Medicine in 1998. Dr. Harvey began his veterinary career in the U.S. Army, serving as Chief Veterinarian at Redstone Arsenal in Huntsville, Alabama. He then joined a small animal hospital in 2001, serving as Associate Veterinarian, in Lake Mary, Florida.

    Dr. Harvey and his wife, Christine, excitedly discovered beautiful Flower Mound after a long search. They purchased Cross Timbers Animal Medical Center (formerly Aladdin Animal Hospital) to realize Dr. Harvey’s dream of practice ownership. Each and every day, the primary goal of Dr. Harvey and his staff at CT-AMC is to provide the most personalized and highest quality health care to each pet in our animal hospital family! Dr. Harvey has since stepped back and is now doing relief work.

    In addition to the practice, Flower Mound is exactly the community that the Harveys were seeking to put down strong family roots for years to come. Dr. Harvey and Christine have three children. There have been many pet family members through the years; including, beloved Rogue and Smokey, the couple’s college cats; sweet Casey Dog, a black and tan coonhound adopted from Redstone in Alabama; and many rescue animals that completed the family.

    When not taking care of our furry friends at Cross Timbers AMC, Dr. Harvey enjoys spending time with his family, golfing, hiking, reading and college football (Go Gators!). Dr. Harvey is also active in the community in the following ways:
    On Board of Directors, Flower Mound Animal Control
    On Board of Directors, Flower Mound Emergency Pet Hospital
    Member, American Veterinary Medical Association
    Member, Texas Veterinary Medical Association
    Den Leader for his son’s Cub Scout Pack
    Committee Chairman for the Cub Scout Pack
    Active Member of the WATCH D.O.G.S Program at his children’s school.

  • Dr. Al Arca

    Relief Veterinarian

    Dr. Al Arca has been with Cross Timbers Animal Medical Center since 2016 as a relief veterinarian.  He graduated with his Doctorate in Veterinary Medicine in 1988 from Texas A&M University.  Dr. Arca has been working as a relief veterinarian in the DFW area for over 14 years!  We are proud to have him with us on most Tuesdays throughout the year and on some Saturdays as his schedule allows.

    Dr. Arca is married to Dr. Sandra Arca, a pediatrician with Cook’s Children Network.  They have three amazing daughters who are following in their parents’ footsteps attending school at Texas A&M University.  The Arca Family includes 2 dogs and 2 cats.  When Dr. Arca is not taking care of his patients, he enjoys jogging, genealogy, reading and keeping up with his kids and furry friends.

  • Laura

    Practice Manager

    Laura has been with Cross Timbers Animal Medical Center since May of 2015. She was born and raised in the area and loves it! Outside of work she enjoys spending time with her many animals – dogs, cats, and even pigs! 

  • Abby

    Veterinary Technician

    Abby initially joined the Cross Timbers family in 2018 as a Kennel Assistant and has been working with our team as a Veterinary Technician Assistant since October 2019. She grew up right here in Flower Mound, graduated from Oklahoma State University with her B.S. in Zoology in 2017, and is currently attending Dallas College’s Veterinary Technology program in pursuit of becoming a credentialed Veterinary Technician. With previous experience in wildlife research, raptor husbandry, as well as domestic animal care including Fear Free and Cat Friendly certification, Abby loves getting to know and help take care of all our furry friends at Cross Timbers! In her free time, she enjoys sketching, getting outdoors, and spending time at home with her own two pups, Picnic and Sadie.

  • Christina


  • Kristyn


    Kristyn and her husband are longtime residents of Flower Mound having both grown up in the area. They have three kids-two sons and a daughter.  They share their life with three dogs, a pony, a horse, a crested gecko and a hamster. 

    Kristyn has over 5 years in the Veterinary Field and considers herself a lifelong learner. After attending SMU, she returned to TWU to further her education. A former teacher, she enjoys educating clients and providing support to our Cross Timbers Family. Forming lasting relationships with our animal friends and their humans is very important to her. 

    Kristyn enjoys getting outdoors, sports, traveling, riding her horse, yoga and time with family and friends.

  • Lulu


  • Mandy


    Mandy is a Veterinary Technician that worked her way up and transitioned from Kennel Assistant. She has always had a passion for animals and has a border collie, Leeloo, and two cats named Lunchkin & Blackberry. In her free time, she loves to volunteer at various animal rescues and environmental groups.

  • Gabbie

    Client Service Representative

    Gabbie moved from New York to Texas in January 2022. She lives in Flower Mound with her husband, Jerry, and their two dobermans- Athina and Ronin. She has been in the veterinary industry for ten years and loves getting to be the first person to greet every furry family member that walks in the door. In her free time, Gabbie likes to like watch movies, go to car shows and cuddle with her dogs. She can’t wait to meet you!

  • Laramee


  • Megan P.

    Client Service Representative

    Megan P. has lived in Flower Mound for 4 years, and is new to the veterinary medicine world! She lives with her husband, three kids, two dogs (Angel and Koda) and a cat (Glitter)! In her free time, she likes to go off-roading and fishing. She is a big-dog enthusiast and gets extra excited anytime a Great Dane walks in our clinic doors. Megan loves getting to interact with people and their pets every day, and is excited to be a part of helping pets live the happiest and healthiest lives they can!

  • Payton

    Client Service Representative

    We welcomed Payton to our team in August 2023. She lives with her husband and two cats. She enjoys spending time with her cats and watching scary movies

  • JP

    Kennel Assistant

    JP started working at Cross Timbers as a kennel assistant in November 2021. He loves working here because he gets to spend time caring for the animals. Before starting his job as kennel assistance, he volunteered at the Flower Mound Animal Adoption Center for 3 years. JP graduated from Flower Mound Highschool in 2021 and is currently attending a local community college. In his free time, JP loves spending time with his four cats (Peanut, Tanner, Boo and Bean), watching movies, working out and playing the piano!

  • Abigail


  • Reece

    Kennel Assistant

  • Taylor