Our Team
Dr. Nichole Weinstein DVM
Medical Director
Medical Director
A California native, Dr. Nichole Weinstein graduated with her pre-veterinary degree from Cal Poly, Pomona, California. She then earned her Doctorate in Veterinary Medicine at the University of the Philippines. She obtained her license to practice in the US at Iowa State University in Ames, Iowa. She then went on…
Jacob Ruiz DVM
Veterinarian
Veterinarian
We are thrilled to introduce Dr. Jacob Ruiz, who has been a valued team member at our hospital since 2016. This year, he graduated with high honors from the esteemed Western University College of Veterinary Medicine and passed his national boards early and with excellence. Dr. Ruiz brings a superior…
Melissa Rezk, RV
Practice Manager
Practice Manager
Melissa brings over 14 years of experience in veterinary medicine, including more than five years in leadership roles. As Practice Manager, she is dedicated to supporting her
team, fostering a positive hospital environment, and ensuring that every patient and client receives compassionate, high-quality care. Outside of work, Melissa enjoys spending time with her two toddlers and getting lost in a good book whenever she can.
team, fostering a positive hospital environment, and ensuring that every patient and client receives compassionate, high-quality care. Outside of work, Melissa enjoys spending time with her two toddlers and getting lost in a good book whenever she can.
Maria, RVT
Registered Veterinary Technician, Room Supervisor
Registered Veterinary Technician, Room Supervisor
Maria received her RVT license from Carrington College, following the completion of her Bachelor's degree in Zoology from Humboldt State University.
As the supervisor of our veterinary assistant team, Maria leads with exceptional care, attention to detail, and a deep commitment to mentorship and teamwork. She plays a vital role in supporting our doctors across many facets of patient care, and her communication with clients is consistently clear, compassionate, and informative.
Alejandra
Veterinary Assistant
Alejandra joined the Arrow Dog & Cat Hospital team in August 2023, bringing with her a cheerful attitude and a lifelong passion for veterinary medicine. It all began when she was just eight years old and accompanied her family dog to its first veterinary visit.
She earned her Associate Degree in Veterinary Assisting from Platt College and plans to continue her education to become a Registered Veterinary Technician.
Cecilia
Veterinary Assistant
Veterinary Assistant
Cecilia is a valued member of the Arrow Dog & Cat Hospital team, bringing a strong sense of purpose, attention to detail, and a deep respect for both patients and clients. She graduated from the Registered Veterinary Technician (RVT) program at Mt. San Antonio College, building on her Bachelor of Arts in Psychology from Cal State University, Fullerton.
Beysa
Vet Assistant
Vet Assistant
Beysa joined our team as a Veterinary Assistant in January 2025. Currently pursuing her Animal Science degree at Cal Poly Pomona with plans to attend Western University's veterinary program, Beysa's passion for animal care began when she started caring for neighborhood cats - a calling that grew stronger over time.
Olivia
Veterinary Assistant
Veterinary Assistant
Future DVM – Class of 2028, Iowa State University College of Veterinary Medicine
Olivia Hanley has been a dedicated Veterinary Assistant at Arrow Dog and Cat Hospital since June 2022. A proud Upland native, Olivia is currently completing her B.S. in Animal Science at Cal Poly, San Luis Obispo, with graduation expected in March 2024.
Osmara
Customer Service Representative
Osmara has been volunteering in animal hospitals since 2015 and began working in practices full-time in 2019 after earning her AA in Animal Science. Osmara is also a certified dog groomer. Osmara has loved and lived with animals her entire life, so a career in the veterinary field was a natural fit! She joined the Arrow Dog & Cat Hospital team this year! Osmara’s critter crew include two dogs, one cat, one rabbit, and two desert tortoises. In her free time, she enjoys grooming dogs, spending time with her animals, reading, and listening to audio books.
Krystal
Receptionist
Receptionist
After an impressive 18-year career in law enforcement and over 25 years in customer service, Krystal followed her lifelong passion for animal care by joining our team as a Receptionist in January 2025. As she puts it, while she loves many things in life, her true passion has always been animals - not just loving them but caring for them, too. Having always had pets, Krystal considers it a dream come true to work in an animal hospital.
Karen
Registered Veterinary Technician
Registered Veterinary Technician
After earning my degree in Veterinary Technology in 2005, I have been a Licensed or Registered Veterinary Technician in four different states. Inthis stage of my career, I have developed a strong passion for customer care and truly enjoy the dual role of supporting both our patients and their families.
Osmara
Customer Service Representative
Customer Service Representative
Osmara has been volunteering in animal hospitals since 2015 and began working full-time in veterinary practices in 2019 after earning her AA in Animal Science. She is also a certified dog groomer. Having loved and cared for animals her entire life, a career in the veterinary field was a natural fit for her. Osmara joined the Arrow Dog & Cat Hospital team this year.
Krystal
Customer Service Representative
Customer Service Representative
Krystal brings an impressive 18-year career in law enforcement and over 25 years of customer service experience. In January 2025, she followed her lifelong passion for animal care by joining our team as a Receptionist. While she has many interests, Krystal says her true passion has always been animals—not just loving them, but caring for them as well.
Alejandra
Veterinary Assistant
Veterinary Assistant
Alejandra joined the Arrow Dog & Cat Hospital team in August 2023, bringing with her a cheerful attitude and a lifelong passion for veterinary medicine. Her interest in the field began at just eight years old when she accompanied her family dog to its first veterinary visit.