Dr. Brennan was born and raised in San Francisco, California.

After working as a medical researcher in biochemistry, she attended University of California Veterinary School in Davis California. For the last 40 years, she has been changing lives in Santa Cruz, California.

The lives she has changed? Animals, owners and people those who work with animals every day. In addition to her years as a practicing veterinarian, Dr. Brennan has served as a search and rescue dog trainer, instructor and handler with the California Rescue Dog Association (CARDA) and the Monterey Bay Search Dogs (MBSD). Her decades long commitment to the physical and behavioral health of animals gives her clients – animals and people alike – unique access to talent, experience and the ability to change an animal’s behavior.