Dr O'Meara along with his son Harry and vet nurse Rebecca Kiem underwent 'the big chop' as part of the World's Greatest Shave, raising over $13,000 for the Leukaemia Foundation.

In the lead up, Dr O'Meara started a fundraising page which as off Friday had raised more than $6000, well surpassing his original $5000 goal.

Dr O'Meara was inspired to raise funds due to his wife Kel's cancer journey.

"Kel has had Lymphoma for 13 years and is still going strong thanks to the doctors and support staff at the Mater Hospital in Newcastle," he says. 

"Every day another 35 Australians are diagnosed with a blood cancer. That's one Aussie every 41 minutes. Although research is improving survival, sadly an Australian loses their life to blood cancer every two hours."

Nicole from Victoria's Hair and Beauty performed the chop, with Dr O'Meara originally vowing to sacrifice only the hair on his head, not his beard. 

However an in-the-moment decision saw his beard removed too, much to the delight of the Pet Medical and Scone Equine Hospital staff present. 

In the moments before he braved the shave, Dr O'Meara made a special announcement. 

"The Directors and Scone Equine Hospital will match the funds raised up to today," he said, which brought the final figure to over $13,000 with the help of $1000 raised from a raffle.

His son Harry also underwent the full chop, while Bec sacrificed her plaits to be turned into wigs for cancer patients.

"I thought 'why not?'" Harry said moments before his full head of hair fell to the ground.

The Leukaemia Foundation is the only national charity dedicated to helping more Australians with leukaemia, lymphoma, myeloma and related disorders survive their blood cancer and live a better quality of life. 

Money raised through the World's Greatest Shave fund vital research to help more people survive blood cancers, as well as making a difference to families by providing the emotional and practical support they need.