Meet our wonderful Doctor and Staff!

  • Dr.
    Diana Stiles

    Dr. Diana Stiles is native to Southern California, having grown up in the nearby San Gabriel Valley. From the age of 9, she knew she wanted to be a veterinarian and passionately pursued her dream. She is a 2001 graduate of Colorado State University, College of Veterinary Medicine and Biomedical Sciences. Upon graduation from Veterinary School in 2001, she returned to Southern California to start her veterinary career. Her main interests include internal medicine and preventative care, and she especially enjoys being in the exam rooms talking with her clients. She is grateful for the many clients who have been with her for years, allowing her to be a special part of their pets' lives from their early years all the way into their senior years. She is excited to open Rancho West Animal Hospital and looks forward to continuing to provide high quality, compassionate care to the pets of the Inland Empire. Dr. Stiles also volunteers her time with a local dog rescue group and is an active member of the American Veterinary Medical Association. Dr. Stiles is married to her high school sweetheart, with whom she has three beautiful children. They also share their home with their 2 dogs, a bearded dragon, and 2 rats. In her free time, she enjoys spending time  with her family, camping, water sports, and reading.  

  • Roxanne Aviles
    Hospital Manager

    Roxanne is our Hospital Manager. She has been in the veterinary field for 9 years and has a passion not only for animals, but to making sure clients are happy too. Since she was a little girl she has always had a special bond with animals. Growing up she has had a number of family pets, such as dogs, cats and fish. Currently, her and her high school sweetheart own two cats, Ollie and Mollie and a pit bull named Dolce. On her free time she loves to spend time with her other half, her pets and family. 

  • Jessica Romero
    Lead Tech/Registered Veterinary Technician

    Jessica is our head technician and licensed RVT. She started at Rancho West as an intern while going to school to pursue her RVT license, and has been part of our team ever since! Jessica has two dogs, Abby and Penny, that she treats as her babies. In her free time she loves spending time with her family and friends.

  • Jordyn Stiles
    Veterinary Assistant

    Jordyn is one of our veterinary assistants. Jordyn aspires to be a veterinarian and has always loved being around and helping all animals. She has one dog named Jessie, and a bearded dragon named Loki. She is currently in school studying animal biology and pre-veterinary medicine. In her free time she loves to hang out with her friends and family, workout, and spend time outdoors. 

  • Melissa Meza
    Veterinary Assistant

    Melissa has loved being a veterinary assistant with Rancho West since 2019. She is currently pursuing her RVT license at Mt. Sac. She has two dogs, Seven and Bear. In her free time she loves hanging out with family and watching movies. 

  • Greg Davis
    Veterinary Assistant

    Bio Coming soon!

  • Mayra Luna
    Veterinary Assistant

    Myra started at Rancho West through her externships, and is now part of the Rancho West Family. She is a student at Platt College Ontario studying to become an RVT.  She is a proud dog mom to a beautiful pup named Momoa (Mo).  Myra loves coffee, game nights, and going on new adventures.

  • Elanica Temblador
    Veterinary Assistant

    Bio Coming soon!

  • Bethany Hernandez

    Bio coming soon!

  • Ben and Jerry West
    Hospital Cats

    Our hospital cats Ben and Jerry, can often be found roaming around, demanding attention. They are super sweet and each one has their own personality. Ben is a strong willed and curious little guy, whose favorite thing to do is pester his brother Jerry. Jerry is much more shy than his brother. He loves to play with his cat toys and when Ben isn't pestering him they have a good time rough housing with each other.

  • Ginger West
    Hospital Cat

    Ginger is another rescue that Rancho West took in. From the moment we adopted her, she took over Dr. Stiles' office and made herself at home. She is very feisty and often demands Dr. Stiles' attention while she is writing up charts or going over cases.

  • Bella West
    Hospital Cat

    Bella is a rescue cat that Rancho West adopted. She can almost always be found napping in her extremely fancy bed. She will also always be more than happy to take any spare treats you might have.


Find us on the map

Rancho West Animal Hospital

8645 Baseline Rd. Rancho Cucamonga,CA 91730 (909) 466-5490

Office Hours

Monday - Friday:

9:00 am - 6:00 pm


9:00 am - 2:00 pm




Read What Our Clients Say

  • ""Best experience! My poor dog had been itching for 5 days relentlessly. One injection and her allergies have been relieved! She is sleeping peacefully tonight! Thank you Dr. Stiles!! You are the Best!!""
    Dawn M
  • ""I could not have asked for a better place. Sadly I had to put down our dog last weekend. The treatment I got and my puppy got was over the top amazing. It's not an easy thing to put your pet down. Having amazing customer service is always a good thing but here they actually care! Thank you from the bottom of my heart for everything!""
    Kerri D
  • ""We found our new fav. Vet!! The first time I met Dr. Stiles I right away had a good feeling she gave my father and I a warm welcome and introduced herself. She took a look at our pregnant female and after examining her she told us the problem and was 100 percent correct. She could have taken advantage of us and gave us the run around but she didn't. She is honest and trustworthy. We had another concern with a puppy and again very honest with her answers and did not try and rip us off or stress out the puppy in any way. I will be telling everyone about Dr. Stiles at rancho vet!!! Thank you for everything you do.""
  • ""I love it here. The doctor is spectacular
    Really nice and professional
    Lovely office""
    Marianne Brenna K.