We are open for extended overnight care on most days. Please see our detailed hours below:
Friday: 9:00 AM – Saturday 6:00 AM
Saturday: 9:00 AM – Sunday 6:00 AM
Sunday: 9:00 AM – Monday 6:00 AM
Monday: 9:00 AM – Tuesday 6:00 AM
Tuesday: 9:00 AM – Wednesday 6:00 AM
Wednesday: 9:00 AM – 11:30 PM
Thursday: 9:00 AM – 11:30 PM
We are open for extended overnight care on most days. Please see our detailed hours below:
Friday: 9:00 AM – Saturday 6:00 AM
Saturday: 9:00 AM – Sunday 6:00 AM
Sunday: 9:00 AM – Monday 6:00 AM
Monday: 9:00 AM – Tuesday 6:00 AM
Tuesday: 9:00 AM – Wednesday 6:00 AM
Wednesday: 9:00 AM – 11:30 PM
Thursday: 9:00 AM – 11:30 PM
CEO
William O’Leary was raised in Chatsworth, California, in a family of horse trainers. Growing up surrounded by horses, hounds, and various farm animals, he developed a deep love for animals. At the age of 18, he secured his first job at an animal hospital, where he started by cleaning cages. Over time, William acquired technician skills and gained experience working at both a day practice and a local animal emergency clinic.
Later, William transitioned into veterinary pharmaceutical sales for IGI and laboratory sales for AVA. In 1998, he founded Mission Veterinary Clinic. He diligently grew the business, balancing his sales job during the day and working at the animal emergency clinic at night.
In 2022, William moved Mission Veterinary Clinic to its current location, just a few doors down from the previous site. This expansion provided the clinic with a much-needed facelift and brought in new doctors and staff.
William’s youngest son is currently in veterinary school and is expected to join the family business soon. In his spare time, William enjoys mountain biking, snow skiing, and wildlife photography.
Veterinarian
Dr. Emmanuel Pimentel Agonizante grew up in Mexico City, Mexico. He studied at the National Autonomous University of Mexico (UNAM) College of Veterinary Medicine and graduated in 2016. His special interests include small animal medicine, small animal surgery, and swine medicine. Dr. Emmanuel moved recently to California with his wife and children along with his pets. In his free time, he enjoys spending time with his family, watching movies, playing video games, and working out at the gym. He is very excited and grateful to be a part of the Mission Veterinary Clinic team and he looks forward to helping owners and pets every day.
Veterinarian
Dr. Flores is a Doctor of Veterinary Medicine at Mission Veterinary Clinic, bringing over 10 years of experience in animal health and care. From a young age, she felt a unique connection with animals and knew her life’s calling was to become a healer dedicated to saving their lives.
She earned her Doctor of Veterinary Medicine (DVM) degree from the National Autonomous University of Mexico (UNAM). To further strengthen her expertise, she completed a Diploma in Internal Medicine and Surgery of Small Animals at UPAEP and holds a Certificate in Emergency and Critical Care Medicine for Dogs and Cats from COMEFAC.
At the clinic, Dr. Flores enjoys tackling challenging cases that require detailed diagnostics and precision care. She is especially passionate about feline medicine and advanced surgical procedures. What she finds most rewarding is providing comfort to animals in distress and ensuring they receive the best possible treatment.
Outside of work, Dr. Flores shares her home with a Great Dane and six cats. Her journey into veterinary medicine is also shaped by a unique background—she first earned an undergraduate degree in International Relations before following her true passion for veterinary science. She also spent a year working at Chapultepec Zoo, where she contributed to the conservation and reproduction program for the endangered Mexican Gray Wolf.
With her dedication, compassion, and advanced training, Dr. Flores is committed to providing exceptional veterinary care to every patient she meets.
Student DVM
Patrick O’Leary, the youngest son of William O’Leary, was born during the construction of the original Mission Veterinary Clinic. Raised in the veterinary hospital, Patrick grew up assisting his family with various tasks, starting with emptying trash and cleaning cages as a young child.
To stay in shape, Patrick enjoys running with his German Shepherd, Heidi. In his spare time, he indulges in snowboarding and playing video games.
Patrick completed his undergraduate studies at California Lutheran University in Moorpark. Currently, he is a fourth Year veterinary student at WesternU College of Veterinary Medicine, set to graduate in May 2026. Upon graduation, Patrick plans to work full-time at Mission Veterinary Clinic.
Manager
Danny has been a cornerstone family member of Mission Veterinary Clinic since 2003, and we are truly blessed to have him with us. As a dedicated manager, he excels in every facet of the hospital, working tirelessly to assist both our clients and their pets. Danny’s passion for animals has been evident since his childhood, where he grew up with three German Shepherds. Even today, he can’t resist leaving his office to greet every German Shepherd puppy that visits our hospital.
With a natural ability and deep compassion for animals, Danny’s career path began in college with a focus on animal science. Later, he obtained a degree in computer science, which has greatly benefited our hospital.
Outside of work, Danny enjoys spending quality time with his wife and four kids. He has a diverse range of interests, including photography, cooking, and computer engineering. His upbeat attitude and strong work ethic make him an invaluable asset to our team. It’s a rare hour in our hospital when you don’t hear a staff member asking, “Where is Danny?”
Shift Supervisor
Andy joined Mission Veterinary Clinic in 2015, starting his journey with a deep commitment to animal care. His passion for veterinary medicine began in high school, where he dedicated months to volunteering, assisting, and cleaning before being offered a position as a veterinary assistant.
Andy pursued his academic interests in Animal Science at California State University, Chico, and further honed his expertise by completing a year of veterinary studies at UNR Facultad de Ciencias Veterinarias in Argentina. He is currently wrapping up his undergraduate courses, working towards a Bachelor of Science degree to pave the way for his application to veterinary school in the USA.
As a supervisor at Mission Veterinary Clinic, Andy’s dedication and hard work shine through in every aspect of his role. His background in competitive water polo and swimming, where he achieved success at the highest levels, has instilled a sense of discipline and focus that he applies to his veterinary career.
In his downtime, Andy balances his rigorous schedule with his love for playing water polo and video games, always striving to maintain a well-rounded lifestyle. His commitment to both his profession and personal interests makes him an invaluable member of the Mission Veterinary Clinic team.
Shift Supervisor
Jeanette graduated from UC Davis with a Bachelor of Science degree in Animal Science, specializing in companion and captive animals, and minoring in Nutrition and Food. Before joining Mission Veterinary Clinic in 2019, she gained valuable experience working in laboratories. Currently, she serves as a lead in the back staff, managing workflow and ensuring that patients receive the highest quality care. Jeanette is a dedicated advocate for her patients, known for her outspoken nature and constant pursuit of improvement. She is a proud pet parent to Chueco, Berlíoz, Ms. Mailey, and Rusty. Jeanette is a highly valued member of our team.
Veterinary Assistant
Shadyra began her career in veterinary medicine in 2006 at a different hospital before joining Mission Veterinary Clinic in 2016. She is highly detail-oriented and the go-to person when something can’t be found. Shadyra is dedicated to continuous learning, regularly reading and watching videos to enhance her knowledge of veterinary medicine, striving to be the best assistant possible. She cares deeply for all patients and consistently goes above and beyond for them. Shadyra has three dogs—Maggie, Georgie, and Lalo—who inspire her to treat clients’ pets like family. When Shadyra is caring for your pet at Mission Veterinary Clinic, you can be assured your pet is in good hands. In her spare time, she enjoys playing video games.
Veterinary Assistant
Carlos joins Mission Veterinary Clinic from Mexico, bringing with him a strong background in veterinary medicine and a deep passion for animal care. He earned his Doctorate in Veterinary Medicine from Universidad La Salle Bajío in León, Guanajuato, where his journey with animals began early in his education and quickly grew into a lifelong calling to care for dogs and cats.
From routine checkups to more complex cases, Carlos has gained valuable hands-on experience in private practices, with a particular interest in surgery and orthopedics. His long-term goal is to specialize in traumatology and orthopedic care, and he remains committed to ongoing learning and professional development.
Carlos is currently working toward completing the Educational Commission for Foreign Veterinary Graduates (ECFVG) program, which will allow him to become fully licensed to practice veterinary medicine in the United States.
What Carlos enjoys most about veterinary medicine is the opportunity to make a positive impact—no matter how small—in the lives of pets and their families. He believes every patient is unique and strives to provide compassionate, personalized care in every interaction.
Now beginning a new chapter in the U.S., Carlos is excited to join the team at Mission Veterinary Clinic as a veterinary assistant. As he transitions into this new role and works toward full licensure, he is grateful for the opportunity to contribute his knowledge, dedication, and love for animals to the clinic and its clients.
Outside of work, Carlos enjoys exercising, going on walks, reading, playing video games, and watching anime and sports—especially soccer, the NFL, and MMA. While he doesn’t currently have pets of his own, his passion for animal care shines through in all that he does.
Carlos looks forward to meeting you and your pets, and he sincerely thanks you for your trust and support as he continues to grow and give his very best—each and every day.
Veterinary Assistant
Pablo N. brings over four years of experience working with dogs and cats, driven by a deep passion for animal care that began with a personal story. As a child, Pablo formed a lifelong bond with a stray cat his sister named Esponja. She was his best friend for 17 years, and her illness and passing inspired him to dedicate his life to helping animals live long, healthy lives with the families who love them.
He earned his veterinary degree from the Universidad de Guadalajara and has received specialized training in feline-friendly handling, emergency care, and urgent care medicine. His professional interests include emergency medicine, surgery, and feline medicine—a field especially close to his heart.
Pablo is currently enrolled in the Educational Commission for Foreign Veterinary Graduates (ECFVG) program as he works toward becoming fully licensed to practice veterinary medicine in the United States. This step reflects his commitment to advancing his veterinary career and continuing to provide high-quality care to pets and their families.
What he enjoys most about veterinary medicine is seeing his patients recover and return home to their loved ones. He understands that pets are family and treats each one with the same care and compassion he would give his own.
Outside of work, Pablo enjoys martial arts, dancing, camping, fishing, and hiking. He shares his life with Nicole, his 8-year-old cat who came into his life during a hurricane and has been by his side ever since.
Pablo is proud to support pet families in the U.S. and is dedicated to making a difference as a trusted member of the veterinary team. “I understand how important pets are to their families, and I will treat them as if they were members of my own family.”
Veterinary Assistant
Alfonso S is a dedicated veterinary assistant with a strong academic foundation and a deep-rooted passion for animal care. Originally from Durango, Mexico, Alfonso’s journey in veterinary medicine began at an early age, inspired by the meaningful bond between humans and animals.
Surrounded by pets and farm animals throughout his childhood, he developed a profound sense of responsibility to care for them — a calling that ultimately led him to pursue a career in veterinary medicine.
He earned his Doctorate in Veterinary Medicine from Universidad Juárez del Estado de Durango, where he developed a special interest in diagnostic imaging, particularly ultrasound and radiography. During his clinical training and fieldwork, he also gained hands-on experience in emergency care and surgical support — areas that require a calm mind, technical precision, and effective teamwork.
Now based in the U.S., Alfonso works as a veterinary assistant while actively progressing through the Educational Commission for Foreign Veterinary Graduates (ECFVG) program. His goal is to become a fully licensed veterinarian in the United States, and he brings both skill and compassion to every patient interaction in the meantime.
Alfonso has worked primarily with dogs and cats, assisting in the diagnosis and treatment of various conditions that impact pets’ quality of life. His technical expertise, especially in imaging, plays a critical role in supporting accurate diagnoses and guiding treatment decisions.
Outside the clinic, Alfonso enjoys playing and watching soccer, staying active at the gym, and exploring new places through travel. Though he doesn’t currently have pets of his own in the U.S., his family back home in Mexico includes three beloved dogs — two Dobermans and a Pitbull — who continue to remind him of the deep connection between people and their animals.
Alfonso is excited to be part of the team and looks forward to providing attentive, knowledgeable care to every patient and client he meets.
Veterinary Assistant
From a very young age, Carolina Rodríguez Mercado knew she was meant to work with animals. Inspired by a deep love for nature instilled by her father—and a childhood filled with animal documentaries like The Crocodile Hunter, Dr. Pol, and Zoboomafoo—Carolina developed a strong sense of responsibility to care for and protect all creatures, great and small. As Steve Irwin once said, “We don’t own the planet Earth, we belong to it. And we must share it with our wildlife.” That belief has guided Carolina throughout her life and career.
Carolina earned her Bachelor’s degree in Veterinary Medicine and Zootechnics from the Universidad Autónoma de Ciudad Juárez, where she laid the foundation for a career rooted in compassion, curiosity, and a commitment to excellence in animal care. Her journey has taken her from small animal clinics to one of the most renowned zoological institutions in Mexico, the Guadalajara Zoo. There, she gained invaluable hands-on experience working with a diverse range of species—from kangaroos and rhinos to giraffes and elephants.
Her areas of special interest include surgery, emergency care, zoological medicine, and wildlife welfare. Carolina has also completed specialized training in wildlife medicine, including preventive care, chemical and physical restraint, and the development of PIMVs and UMAs—important tools in wildlife management and conservation.
Carolina brings with her over two years of professional experience, including a full year working in a veterinary clinic where she discovered her passion for surgery. Her practical skills are matched by her deep empathy, a quality that shines through in every patient interaction. Whether she’s helping a cat recover from illness or training a dog to overcome behavioral challenges, she finds great joy in seeing animals thrive under her care.
Outside of the clinic, Carolina is an avid gamer, book lover, and anime fan. She enjoys exploring new foods, discovering hidden gems with friends and family, and spending quiet moments with her own pets—two chihuahuas, Tequila and Griselda, and three cats: Pato, Mr. Norris, and Pandora.
Now continuing her professional journey in the United States, Carolina is both grateful and excited for the opportunity to grow as a veterinarian and serve a new community of pets and their people. Her goal is simple but powerful: to treat every animal as if they were her own and to offer the kind of care that makes a lasting difference.
“I know our animals are family, and I value their health and well-being as if they were my own. Thank you for your trust—I’m here to give 110% every day.”
Veterinary Assistant
McKenna’s path into veterinary medicine began in an unexpected way. She originally envisioned a career working with children, but after losing her beloved cat and closest companion at just two years old, she felt called to dedicate herself to helping both pets and their owners. She believes that for many people, a pet is their only family, and she strives to provide compassionate care for animals while also supporting the people who love them.
McKenna graduated from the University of California, Davis in 2022 with a Bachelor’s Degree in Animal Science. She is currently continuing her education through the Veterinary Technology Program at Platt College, where she is pursuing her Veterinary Technician License. Along the way, she has gained experience across a wide range of fields, from livestock and equine care to veterinary oncology, integrative medicine, and research. For the past three years, she has dedicated her focus primarily to small animals.
Her special interests include surgery and emergency care, and she hopes to one day expand her experience into wildlife medicine. McKenna also holds certifications through IUCAC for working with research animals such as non-human primates and sheep, and she looks forward to adding her Veterinary Technology certification upon completing her program.
What McKenna enjoys most about veterinary medicine is helping dogs and cats recover so they can return to their families. She finds it especially rewarding to see the joy and relief on an owner’s face when their beloved pet is healthy again.
Outside of the clinic, McKenna keeps busy with swimming—she even teaches swim lessons to students of all ages. She also enjoys spending time with friends and visiting Disneyland whenever she can. At home, she is happily surrounded by her four cats: Bella, a 16-year-old Maine Coon mix; Olive, a 6-year-old tabby; Allie, a 4-year-old calico; and Linus, her newest addition, a 4-month-old black tabby kitten. Each one holds a special place in her heart, even if they’d gladly trade her for a treat.
Veterinary Assistant
Jeremy’s passion for veterinary medicine began in the Philippines, where she grew up surrounded by stray animals in need of care. Witnessing how much they struggled without medical attention inspired her to dedicate her career to helping animals and supporting the people who love them.
She earned her Doctor of Veterinary Medicine (DVM) degree from the University of the Philippines and is currently completing the ECFVG (Educational Commission for Foreign Veterinary Graduates) certification, which aligns international veterinary training with U.S. standards. Her main area of interest is internal medicine, where she enjoys the challenge of diagnosing and treating complex cases.
Jeremy has extensive hands-on experience from her veterinary training in the Philippines, where she cared for a wide variety of species. She worked closely with dogs and cats—conducting wellness exams, providing medical treatments, performing surgeries, and educating clients on proper pet care. In the U.S., she has continued her career as a veterinary assistant, gaining valuable experience in general practice, emergency care, and high-volume spay and neuter programs.
For Jeremy, the most rewarding part of veterinary medicine is seeing sick animals recover and thrive, while helping owners feel informed and confident in caring for their pets.
Outside of work, she enjoys roller skating, making bracelets, and listening to Taylor Swift’s music. At home, she has a sweet but often “unamused-looking” Bengal mix cat named Ryuk, who loves cuddling and naps.
Jeremy is dedicated to providing compassionate care and strives to ensure every client feels supported and reassured throughout their pet’s care journey.
Veterinary Assistant
Kaori Betancourt has been passionate about helping animals for as long as she can remember. As a child, she often wondered how she could do more for her pets—and when she learned that there were doctors for animals, she knew exactly what she wanted to become.
Kaori earned her Doctorate in Veterinary Medicine from the Universidad Autónoma de Guerrero, at the Escuela Superior de Medicina Veterinaria y Zootecnia in Tecpan de Galeana, México. Since graduating, she has focused her career on small animal care, working extensively with dogs and cats. She is currently pursuing the Educational Commission for Foreign Veterinary Graduates (ECFVG) certification, a program that will allow her to become fully licensed to practice veterinary medicine in the United States.
Her clinical experience is both broad and hands-on. Kaori began as a veterinary assistant, performing a wide variety of tasks—from sample collection and patient monitoring to administering medications and providing intensive care. Over time, she expanded her role to include consultations, ultrasound diagnostics, X-rays, lab work, treatment plans, client education, and compassionate end-of-life care.
She has a strong interest in internal medicine and diagnostic imaging, particularly ultrasound. She is currently enrolled in a postgraduate program in Emergency Ultrasound and has also completed specialized training in abdominal ultrasound.
What Kaori enjoys most about her work is the constant opportunity to learn. “Every day is a chance to grow,” she says. “Whether it’s from colleagues, patients, or pet owners, I’m always learning something new.”
Outside of work, Kaori enjoys watching documentaries and exploring new foods. She’s also a devoted pet parent to three furry companions:
Kaori is excited to be part of the Mission Veterinary team and looks forward to continuing her journey while providing the highest level of care to every pet she meets.