Welcome to Rancho West Animal Hospital! Your Veterinarian in Rancho Cucamonga, CA

If you live in Rancho Cucamonga or the surrounding area and need a trusted veterinarian to care for your pets – look no further! Dr. Diana Stiles and her associates treat all types of pets, including cats, dogs, pocket pets, and some reptiles. Your pets’ health and well being are very important to us. When first entering our doors, expect a warm welcome, and for you and your pet to immediately become our family. Here at Rancho West Animal Hospital we aim to be a calm and compassionate veterinary hospital, and provide you with the best care your pet deserves.

We are a full-service animal hospital, welcoming both emergency treatment cases, as well as pet patients in need of routine medical, surgical, and dental care. Dr. Diana Stiles has years of experience treating serious conditions and offering regular pet wellness care.

If you have any questions, call 909-466-5490, email [email protected], or use our "Contact Us" section on this page in the featured article section, and we will promptly get back to you. We also invite you to download our app on your phone, where you can schedule appointments, refill medications, place food orders, and submit adorable selfies of your pets.                                                                                             

Appointment Requests


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.