Richmond cancer survivor Maree Twomey shaves her head for the World's Greatest Shave

It's not every day a dog contributes to blood cancer support, but Ted from Richmond was happy to support the cause on the weekend, when his owner Maree Twomey took part in the World's Greatest Shave.

Ms Twomey was diagnosed with bowel cancer four years ago and underwent a major operation.

Almost four years to the day, which was a few days before Australia Day this year, she received the unbelievable news that she was cancer-free.

"It had been in its third stage and was going into terminal. I'm so blessed to have been given the news that I'm cancer-free," she said.

Ms Twomey's dog Ted - who is a basset-hound-mastiff cross - was cast in the role of the mascot for the event, sporting a World's Greatest Shave bandanna, and he also gave up a small strip of shaved fur for the cause.

The World's Greatest Shave supports the Leukaemia Foundation, which helps families beat blood cancer.

Ms Twomey was compelled to participate in the event so she could give back, and said every little bit helps.

"It's a way of giving back. If I could help all cancers, I would. To just give someone a chance is my aim," she said.

Ms Twomey is well-known in the community for her work with the Hawkesbury bipolar disorder support group Bipolar Bears which meets at Hawkesbury Hospital.