The 46-year-old will consume only water for three days and continue to work.
"It won't be easy but I'm doing this by choice and I know I can eat at the end of it. These dogs don't have a choice. It's so disheartening to see such unnecessary suffering."
She hopes her efforts will encourage people to report cases of abuse or neglect, or to seek help if they are struggling to care for their animals properly.
"I want to do something that will draw attention to any other dogs that are tied up somewhere, slowly starving to death. I want to put my hand up and ask the people in our community to help us stop it from happening again.
"[The SPCA] can't be everywhere at once so we need neighbours, friends and family to report cases of neglect and abuse to us. We know it takes courage because people who abuse pets are likely to abuse people too - but the alternative could be letting an animal die."
SPCA chief executive Ric Odom said animal starvation was not uncommon but many more cases would occur than those reported to the organisation.