About Us
AZPetVet Westbrook Animal Hospital has been a part of the community since 1998.
Over the years, our experienced and compassionate team has provided tender, loving veterinary care to thousands of pet patients – many for the duration of their lives. As caring providers of quality preventive, medical and surgical veterinary care, our goal is to help you keep your beloved pets healthier and happier at every stage of their lives. It’s our privilege, and our promise, to always do our best for you and your pet.
The doctors and staff at AZPetVet Westbrook Animal Hospital want to be your trusted partners in caring for your pet and keeping them in good health. We strive to build long term, family-like relationships with our clients and their pets. We also pride ourselves on offering a broad range of services from routine wellness to advanced veterinary treatments and services for those treasured members of your family.
Watch this video to learn more about the AZPetVet family.
WOW Promise
We’re animal lovers and pet parents, and just like you, we want the very best for our furry (and sometimes not so furry) family members. That’s how the WOW Promise became the foundation of everything we do. Whether it’s routine wellness exams, medical, surgical or dental services, payment plans, grooming or other services, our goal is to WOW you and your pet, every step of the way.
Only The Best
Our Family of Hospitals
For more than 35 years, our AZPetVet family of animal hospitals have been caring for your furry friends. Our reputation has been built upon outstanding service and nurturing our relationships with pet parents, like you.

Our Doctors

Dr. Chris Hummel
I graduated from Purdue University School of Veterinary Medicine in 1994. I spent time practicing in Houston, Texas, and the greater bay area in northern California before moving to the greater Phoenix area in 2003.
Since coming to the valley, I have worked in multiple veterinary hospitals within the AZPetVet family of hospitals as a relief veterinarian. I started working as a full-time veterinarian at Goodyear Animal Hospital from July 2005 to September 2007 before transferring to Westbrook Animal Hospital as a partner/veterinarian in 2007. I enjoy all aspects of veterinary medicine, from surgery to medicine in dogs, cats and small mammals, such as guinea pigs and ferrets.
My spouse and I live in northwest Phoenix with our 3 wonderful rescue cats, Kazi, Stache and Cricket. When I am not working, I enjoy kickboxing, walking, hiking, cycling, Tai Chi, yoga, caring for my plumeria collection, and reading.

Dr. Martha Ullman
I grew up in the Northwest Indiana/Chicago area. I graduated from Purdue University in 2009. I first moved to Phoenix for an internship after school but returned to the Midwest to work in several states before ultimately returning to the valley.
My interests in practice include preventative medicine, surgery, diagnostic imaging, and dentistry. In my free time, I enjoy hiking, running, baking, and equestrian sports. I live in the Phoenix area with my husband, our dogs: Elli and Freya, our one-eyed cat: Odin, and our Sulcata tortoise: Tyre.

Dr. Brandy Stewart
I grew up in Hawaii, where I met the love of my life. I attended the University of Hawaii at Mānoa for a bachelor’s and a master’s in animal science. I attended Colorado State University and received my Doctor of Veterinary Medicine in 2019. My love for animals began at a young age with a childhood pet, a kitten named Angel. Angel had Hydrocephalus (water on the brain) And, Boom! My obsession with veterinary medicine began. My many childhood trips to the zoo and later volunteering at one ignited my passion for exotic animal medicine. I love working with exotic animals, but my main passion resides in the feline department.
My husband and I fell in love with Arizona and decided to relocate here! We have a long-haired kitty named Gidget and a small chihuahua mix dog named Lady. In my free time, I enjoy spending time with family, watching movies, reading, visiting zoos, and exploring the outdoors. I am excited to have joined the AZPetVet team and look forward to meeting you and your furry family.

Dr. Caitlin Johnson
I was born and raised in the Valley of the Sun. I attended the University of Arizona, where I completed my undergraduate degree in Veterinary Science in 2015. Then, I moved to the Caribbean island of St. Kitts, earning my Doctorate of Veterinary Medicine at Ross University in 2019. My senior clinical year was spent at the University of Illinois, where I figured out just how much I dislike winter, so I decided to move back home to Phoenix. I am interested in all aspects of small animal medicine, soft tissue surgery, and pocket pets.
In my free time, I enjoy traveling, exploring Arizona, and spending time near the water. While at home, I enjoy watching TV with my two cats JD and Luna.