WARNING: GRAPHIC CONTENT

A Perth woman is warning park-goers to proceed with caution while walking their pooches after her 77-year-old father was attacked by an out-of-control dog.

Yesterday morning was like every other morning for Tony Stackpole, pictured. He got up, dressed and walked his daughter’s Great Dane, Dexter.

But routine went out the window when an off-leash Mastiff lunged at Mr Stackpole at Sir James McCusker Park in Iluka, sinking his teeth into the dad’s leg and pushing him to the ground.

“My dad called out, ‘Has your dog done this before?’ and the owner replied ‘No’,” Mr Stackpole’s daughter Rebecca Elston said.

She claimed the owner remained on her phone even after the unprovoked attack, leaving her father to struggle to his feet. “He was very faint and in shock,” Ms Elston said. “My dad had been chatting to various people in the park but at this particular time he was alone with no witnesses.”

A dog lover himself, Mr Stackpole has been walking Dexter daily for 14 months, since his own dog died.

The grandad had to drive himself home and has since received a tetanus shot and antibiotics to prevent infection of the wound.

The incident was reported to police and the ranger.