The officer was pulled to the ground by the dog but managed to call for back up.
He suffered moderate to serious injuries to his entire body during the attack, and was now receiving medical treatment.
Following the attack the man and his dog left the scene in a vehicle, police said.
When police signalled for the man to pull over, he fled to a house in Bainesse.
When officers arrived at the property they were confronted by the man who was wielding a metal bar and displaying threatening behaviour, police said.
Detective Inspector Chris Bensemann said police were rallying around the officer who was doing his job when he were "viciously assaulted".
"This appalling and unprovoked attack on this skilled and valued officer shows the volatile nature of our work and how incidents we attend can quickly escalate."
Officers were speaking to a number of witnesses, he said.
Mr Bensemann said the man was in police custody and would face a number of charges.
His dog was seized by local animal control.
A police spokeswoman said the officer had suffered bite wounds to most of his body, as well as being punched in the face, and was receiving medical treatment at a local medical centre.
He had not been admitted to hospital.
She was unable to confirm what breed of dog was involved.
"I've asked the officers at the scene... I think they are a bit more concerned with their colleague at this stage which was entirely understandable."
She was unable to comment on what charges the man was facing, but said it was likely he would appear in court at some stage this week.
"There were a number of people around at the time of the attack so we are still speaking to them. I think there was a large amount of people who witnessed it.
"Once we have gone through that process and spoken to them... then we will confirm his charges and he will appear in court."
