The real estate agent had gone to a home to collect rent money from a tenant on Monday when he was viciously attacked.
It is believed a pit bull was responsible for the man's injuries at Werrington, in Sydney's west, Nine News reported.
Paramedics raced to the scene on Railway Street about 2.30pm and treated the man outside the home.
He suffered wounds to his hands, arms and legs after desperately trying to fight off the dog.
The man, believed to be aged in his 50s, was later taken to nearby Nepean Hospital for further treatment.
His daughter took to a Facebook group to inform residents in surrounding suburbs of the attack.
'He fought it off as long as he could then called out for help as it wouldn't back off,' she wrote.
Penrith City Council's animal services team has taken possession of the dog as inquiries into the attack continue.
(Daily Mail - July 24, 2017)
