Bloody dog attack in Sydney leaves three with severe bite wounds

Three vicious dogs that resisted Taser shocks have mauled a police officer and a couple in a bloody attack outside a home in western Sydney.

A 48-year-old man suffered multiple severe bite wounds to both arms and legs while his partner, 43, was bitten on the leg and hip when they were attacked by their neighbour's dogs on arriving home in Penrith on Wednesday night.

A police officer who rushed to the Parker Street scene suffered a dislocated shoulder and deep bite to her leg after two of the dogs knocked her to the ground. Blood could be seen splattered on the ground and fence of the property.

Inspector Kylie Koenig from Penrith Local Area Command said the officer's leg wound went through to the bone and that she would need surgery.

Blood stains on the ground at a house on Parker St in Penrith where a multiple dog attack took place on Wednesday evening.

"There was a young child that was present at the time," Insp Koenig told reporters on Thursday.

"It was quite a traumatic incident for all.

"They were extremely vicious dogs that required police to use OC spray numerous times and even resort to the use of a Taser, which had very little effect."

No decision has yet been made about future of the dogs, which were being held by Penrith Council yesterday afternoon.

Their owner, a 29-year-old man, and his 31-year-old partner were both due to face Penrith Local Court yesterday.

It's alleged the man threatened a senior constable after he was told the dogs had been taken to the pound.

The 31-year-old woman is accused of intimidating neighbours and breaching bail conditions.