Our Practice

To us, pet care is more than just medicine—it’s an ongoing experience, a friendship to last a lifetime. Therefore, we work with you through every stage of your pet’s life to keep them as healthy as they can be. When you partner with us, we also educate you on your pet. In turn, you’ll know how to make the most informed choices when it comes to their welfare. After all, most of your pet’s care takes place in your home. Moreover, when they’re under our roof, they’ll be treated like the family members they are. When we’re not taking care of pets in our full-service facility, we’re helping our community. From Canine Companions for Independence to DFW Lab Rescue to Mazie’s Mission, we feel it is our responsibility to help organizations dedicated to improving the lives of pets everywhere. Along with Plano, we happily serve the pets of Allen, Frisco, McKinney, and other surrounding areas. Regardless of where you’re coming from, you and your pet are always welcome here.

  • David Cinclair, DVM


    Dr. Cinclair grew up in Plano and graduated from Plano Senior High School in 1987. A trio of very special Cairn Terriers and a love for animals were his inspiration to go to Texas A&M in pursuit of becoming a veterinarian. He attended Texas A&M and graduated magna cum laude in veterinary science. He also attended Veterinary School at Texas A&M and graduated magna cum laude in 1994. Dr. Cinclair moved to Frisco in 1994, and began practicing small animal medicine with an established and well-respected Plano practice. In 1999, he left the group and established Custer McDermott Animal Hospital in the West Allen/North Plano area, where he continues to practice today. Special interests include dentistry and dermatology.

    Dr. Cinclair is a member of the Texas Veterinary Medical Association and the American Veterinary Medical Association. He is also an active member of the Texas Academy of Veterinary Practice, an organization whose members strive for excellence through participation in a high level of continuing education seminars and labs. Dr. Cinclair enjoys and appreciates the opportunity his profession allows him to work with and care for dogs and cats, and to establish relationships with his clients. Dr. Cinclair and his wife Becky moved back to Plano in 2001. The Cinclairs have been blessed with four wonderful children, two Cairn terriers, and a cat. Outside of work, Dr. Cinclair enjoys spending time with his family, the outdoors, and following local sports teams.

  • David Pilkington, DVM


    Dr. Pilkington is a 1998 graduate of Texas A&M’s College of Veterinary Medicine. He knew he was destined to be a veterinarian after winning a cow milking contest in the first grade. While his career started with food animals, he is now happy to practice companion animal medicine. Dr. Pilkington moved from Connecticut to Texas in 1979, and became friends with Dr. Cinclair and his family shortly thereafter. He now lives in Plano with his wife Susan, their four children (Chandler, Bennett, Dorrie Beth, and Anne Marie), as well as their hairier children: Cotton, a DSH cat, and Penny, a King Charles Cavalier Spaniel (their newest addition).

    When not practicing medicine or volunteering, Dr. Pilkington enjoys spending time with his family, playing softball, various outdoor activities, and often to his demise, cheering for the Aggies. He is also very involved with men’s groups and youth education at his church in Plano. He is very excited to practice veterinary medicine not only with an esteemed colleague, but a good friend. Dr. Pilkington believes veterinary medicine is about helping pets, and people too. He is dedicated to strengthening the human-animal bond.

  • Alexandra Brewer, DVM CVMA


    Dr. Brewer is native to southeast Louisiana, where she attended LSU for both her undergraduate studies and veterinary school. Following graduation in 2007, she lived in various areas of the country, including Las Vegas and Charlotte, NC, before settling down in Texas.  She joined our practice in 2015 and has really enjoyed getting to know our clients and their pets. Recently, she earned her certification in veterinary medical acupuncture and is now offering that service.  She also enjoys preventative and geriatric care, internal medicine, and dermatology.

    Dr. Brewer and her husband Jason have two young children, and they enjoy exploring the north Texas area. She also shares her home with a yellow Lab named Benny (Dr. Brewer’s first baby), and a Pug mix named Mattie.

  • Stephanie LaGrone, DVM


    Dr. Stephanie LaGrone grew up in Plano, less than 5 miles away from CMAH. She graduated from Plano Senior High School in 2006. Growing up, she had a huge love for animals and brought home any stray she could find. She knew from a very young age that she wanted to be a veterinarian and began working at an animal clinic at the age of 17.

    In 2010, Dr. LaGrone graduated from Louisiana Scholars’ College
    at concentration in Scientific Inquiry. She then went on to receive her DVM from Louisiana State University School of Veterinary Medicine in 2014. In school, she worked with the Wildlife Hospital of Louisiana and is a huge fan of LSU football. After completing Veterinary school, Dr. LaGrone moved back to Dallas to be closer to her family.

    At home Dr. LaGrone enjoys reading, cooking, and spending time with her fiancé Spencer, and their pets. She has 2 cats, a Great Pyrenees named Wyatt, and a terrier named Milo. She also has pet dwarf goats and chickens.

  • Jeanie Bernier

    Practice Manager

  • Vickie Kennedy


    Vickie has been a receptionist at Custer McDermott Animal Hospital since September of 2003. From 1989-2000, Vickie lived in Hong Kong, China, and the Philippines. Before moving overseas, Vickie worked 9 years for Myers Financial Corporation in the Land Development department. Currently, she lives in Frisco and enjoys the company of her cats, Callie and Hobbs. In her spare time, Vickie likes to spend time reading, seeing movies and of course spending time with her cats.

  • Kevina Thompson


  • Sadie Nelson

    Veterinary Technician

    Sadie attended Texas A&M University in Commerce where she obtained her Bachelor’s degree in Animal Science in 2008. She has been working in the veterinary field since 2006 and joined our team in 2016. When Sadie is not at work, she is caring for a busy household consisting of her husband, Kevin, two young sons, 4 horses, 3 dogs, 10 chickens, and one cat. She enjoys spending time outside with her family and animals including ATV riding in the mountains and horseback riding. She is passionate about engagement with the team at CMAH as well as customer service and patient care.

  • Bailey Fields

    Veterinary Technician

    Bailey Fields has been in the Veterinary Field since 2013, working her way up from a Kennel Assistant to a Veterinary Technician. She joined the CMAH family in November 2018. As a child, she loved animals and would read and learn as much as she could about them, until she was old enough to work with them. She is a mom to 1 dog, 2 cats; one of which is a 3 legged Siamese. When she is not traveling with her family, she enjoys reading, video games, and spending time with her animals.

  • Kim Spitzer

    Veterinary Technician

  • Tammy Spade

    Veterinary Technician

    Tammy has been a Veterinary Technician since early 2016. Tammy joined the team at CMAH in March 2017. As a child, Tammy knew she wanted to work with animals someday, but put that dream on hold to start a family with her husband Steve. Tammy and Steve recently celebrated their 31st wedding anniversary. Tammy has 3 cats and 3 dogs. In her free time, she enjoys catching up on her favorite tv shows, spending time with her 9 grandkids, and traveling.

  • Lindsey Walker

    Veterinary Technician

    Lindsey is a Texas born Tennessean. She moved back at the beginning of 2017 to be closer to her Texas family. She has been a veterinary technician for almost 4 years and has enjoyed every minute of it. Lindsey has two dogs who love to hang out in the creek and camp. She also has a cat who doesn’t care much for the outdoors. Lindsey is grateful to be a part of the team at CMAH and looks forward to new adventures!

  • Callie Moseley

    Veterinary Technician

    Callie has been a veterinary technician since 2008, joining the CMAH family in May of 2016. Originally from Louisiana, she spent most of her life in the Plano/Allen area. She and her husband Perry welcomed a son, Josh, in 2006, later adding 3 cats (Elvis, Willie Nelson, and Beyonstray) and a Dachshund (Drake). In her free time, she enjoys painting, reading, and volunteering at the second chance SPCA; offering her technical skills performing laboratory testing, and fostering kittens.

  • Frances Vaughan

    Veterinary Technician

    After raising a family and moving to McKinney in June of 2003, Frances began to pursue a career in the veterinary field. She started out as a receptionist and attended classes to become a registered veterinary technician. With a lifelong love for animals and always having pets as part of her family, the choice was not a hard one to make. Frances joined the Custer McDermott staff in April 2006 as a veterinary technician. Helping clients take care of their pets, which in many cases are like family members, is one of the aspects of veterinary medicine that Frances enjoys the most. In her spare time, she enjoys spending time with her dogs, Polo, Noel, and Ricon. Frances also enjoys fishing, hiking, and trail riding on her Morgan horse, Skeeter.

  • Kelsey Chatigny

    Veterinary Technician

    Kelsey graduated from Stephen F. Austin State University in December 2017, receiving a Bachelor’s degree in Equine Science. She began following her passion in 2010 with volunteering at the McKinney SPCA and has continued in the veterinary field since. Kelsey joined the Custer McDermott staff in June of 2018. In the future, she plans to attend veterinary school and pursue Equine Reproduction afterwards. Kelsey enjoys working with her two dogs Sammy, a Rhodesian Ridgeback; and Chloe, a Jack Russell Terrier; competing at shows with her horse, Cuervo, and spending time with her family in her free time.

  • Curstin Williams

    Veterinary Technician

    Curstin has lived in Texas for most her life and she has always had a very big interest in animals since childhood. Wanting to get as much experience as possible in the veterinary world, she took all the classes she could in high school, and completed a 2 year program at a vocational school allowing her to become a Certified Veterinary Assistant. In her spare time she enjoys reading and spending time with her friends and family. She is currently the owner of a schnauzer terrier mix named Bella, however she credits her childhood dog Brownie, a lab mix, for being there for her while she grew up.

  • Wendy Gillman

    Veterinary Assistant

    Wendy has been working with animals off and on for over 20 years, joining the CMAH family in January 2018.  She has always loved working with animals, and taking part in the progression of animal care over the years. In 2008, she married the love of her life, Ryan, who embraces her love for animals; especially those with special needs. They have a 3 legged Brittany named Bud, a Douge De Bordeaux named Cre, a Leopard Tortoise name Turtle, 2 crested geckos, and a veiled chameleon. In her free time she likes to spend time with her husband trying food from other cultures, cooking, baking, reading, watching movies, taking walks with her dogs, and fostering animals.

  • Ashley Priest

    Veterinary Assistant

    Ashley Priest joined the CMAH family in April 2018. She has known she wanted to pursue a career in the Veterinary field since she was 6 years old, and after enrolling in a Veterinary program at Plano Senior High School, it has allowed her to dedicate more time to her passion for learning about Veterinary Science. She is currently enrolled as a freshman at Texas A&M University majoring in Animal Science. She takes pride in her role as her High School’s FFA President and raises market pigs. In her free time she enjoys riding horses, playing with her dogs, and hanging out with friends. Test