Our Team

The Team at The Pet Hospital of Tierrasanta

Our veterinary team is made up of highly qualified individuals committed to giving your furry friends the best care possible. To ensure that your pets receive the highest quality care and treatment possible, we work closely with pet owners.


Meet the incredible team taking care of your pets.

dr barnes
Dr. Barnes


Dr. Barnes recently moved from Massachusetts to San Diego fulfilling her life dream to live in California. Dr. Barnes graduated from Michigan State Veterinary School in 2011 and started her private practice. In her free time, she loves spending time with her three cats: Mew Mew, Patty Cakes, and Seth. Dr. Barnes also likes trying new places to eat, traveling, reading, and doing yoga.

dr mike
Dr. Casemier


Dr. Casemier was born and raised in Grand Rapids, MI, but now calls San Diego home.

After an honorable discharge from the U.S. Navy, he earned his undergraduate degree from Grand Valley State University. He then went on to earn his veterinary degree from Michigan State University.

He worked with horses early in his career but has since focused on companion cats and dogs. Dr. Casemier is grateful for the long-term relationships he develops with his clients.

When he isn’t taking care of his patients, Dr. Casemier enjoys spending time with his nine-year-old chocolate lab named Dexter and his five-year-old, aptly named cat, Lilith.

dr marie
Dr. Twibell


Dr. Twibell is originally from the coast of California. She earned her undergraduate degree from Cal Poly SLO and her veterinary degree from UC Davis Veterinary school in 2022. Her main interests include surgery and preventative medicine. She enjoys the teamwork of veterinary medicine and building relationships with her clients and patients.
When she isn’t taking care of her patients, Dr. Twibell enjoys horseback riding, hiking, reading, spending time with family and friends, and attending church and Bible studies. Dr. Twibell and her husband also have a shelter dog named Harper, which provides them with much love and laughter.

Dr. Michelle
Dr. D’Angelo


Dr. Michelle D’Angelo was born and raised in San Diego. After getting her bachelor’s degree at UC Santa Cruz, she continued on to veterinary school at UC Davis and graduated in 2006. She loves treating her canine and feline patients and has a particular fondness for old cranky pets.

In her free time, Dr. D’Angelo often travels, escapes to Disneyland, or plays word games on her phone. She has a fantastic shelter mutt named Homer and two wonderful cats, Gidget and Bacon.


Practice Manager

A San Diego native, Brittany has been working in the veterinary field since she was 17 and has been a part of our team since 2013. Outside the hospital, she spends time keeping up with her daughter, two Chiweenies (Baby Dog and Dash), and her newest rescue, Foxy the chihuahua.


Registered Veterinary Technician

Originally from Atascadero, CA, Tiffany has been living in San Diego for seven years and has been with us for three years. Tiffany graduated from San Diego Mesa College’s Animal Health Technologies program in 2015 and is now a registered veterinary technician at The Pet Hospital. She and her husband welcomed their first fur baby Tucker, a German Shorthaired Pointer, in January 2020. So she spends her days off at the dog parks and beach or takes him hiking.


Veterinary Assistant

​Native to San Diego, Isela has been in the veterinary field since 2015. She came to us after working at the animal shelter and other private practices. When she is not working hard at the hospital, she takes care of her two fur kids: Mia, the Jack Russell Terrier, and Jayden, the lab-pitbull mix, two years old. She also loves spending time with her family and friends. Isela is working on furthering her career in the veterinary field by taking her boards to become an RVT.


Veterinary Assistant

Jacqueline was born in San Diego, and her love for animals started as a kid when she would bring strays home. She attended school at PIMA medical institute in the veterinary assistant program and graduated in 2014. Jacqueline did her externship at Lakeside veterinary hospital and moved on and did some work at a groomer as a bather. She now works at both WAG hotels and the pet hospital. Jacqueline’s free time is spent hanging out with her 9-year-old daughter and 6-year-old miniature Dachshund.


Veterinary Assistant

Sarah has been a part of The Pet Hospital family since May 2021 and has worked in the veterinary field since 2007. Sarah graduated from SDSU in 2007 with a master’s degree in Psychiatric Rehabilitation. Sarah and her daughter love spending time at home with their 4 fur babies, Blue the sweet Staffordshire Terrier, Pepper Poppet, the cutest Frenchie; Zoe Zombee, the baby Sphynx; and Flash Gordan, the chubby Maine Coon. Sarah’s hobbies include collecting dolls, Acutonics (an energy-based non-invasive treatment like acupuncture), and Entomology (the scientific study of insects).



Born and raised in San Diego, Angela has worked with animals since she was 19. She has done most of her work with parrots, waterfowl, dogs, and cats. Angela worked as a Veterinary Assistant/Receptionist for six years before deciding to work solely in reception. Angela spends time with her fiancé and two boys when she is not at work. Angela has no pets but always keeps her eye out for her subsequent rescue.



Originally from Colorado, Cyra grew up in a small farm town where her love for animals began. Cyra joined our team in July 2021 after working as an assistant manager at a dog groomer and, before that, as a cashier at Petco. Cyra and her wife have another full-time job taking care of their 9 fur babies when she is not working. Three cats; Skipjack, Mackerel, and Anchovy, along with six dogs; Flying Dutchman (Giant Schnauzer), Mako Shark, Mama Odie, Tornado Potato, Tsunami (all French Bulldogs), and Ween Bean (Chihuahua). Cyra also enjoys reading, Dungeons and Dragons, magic gatherings, board games, and video games.



Lori graduated from San Diego Grooming School in 1980. With over 35 years of grooming experience, Lori is particularly interested in German Shepherds and Shih Tzus. When not grooming, she enjoys solving cryptograms.