Dog breeder lashes out after bullmastiff attacked his mother, 54, in Pheasants ...

The family of a 54-year-old dog breeder who was almost mauled to death by her beloved bullmastiff has lashed out at a reporter, screaming: 'You're lucky that dog's not here!'   

The pet - which reportedly weighed more than 80kg and was likened to the size of the Shetland pony grazing in the front paddock - sunk his teeth into the mother's face out the front of her home in Pheasants Nest, an hour south-west of Sydney, on Saturday. 

Her daughter, who is in her 20s, tried to save the mum but the vicious canine bit into her thigh so deeply that onlookers said her tendons and bones were exposed.

The beast only stopped when a brave neighbour stabbed him repeatedly with an iron bar in a move a local man said almost certainly saved her life.

When approached by Daily Mail Australia, the woman's son screamed across the lawn that his mother was still at Liverpool Hospital and the pet in question was dead.

Dressed in a black hoodie, he yelled 'you're lucky that dog's not here,' and gestured inside the family home where a chorus of dogs could be heard barking madly.

'You know what happened here the other day and you want to walk in here?' he bellowed, storming across the yard.

While it was previously reported that the family refused to hand over security footage when asked by police, the furious man claimed that was simply not true.

'The cops wanted me to get [the footage] right then and there, but I didn't give it to them because of what happened - I wanted to see my mum,' he said.

'I've got f***ing puppies here and I'm busy,' he continued, referring to his family's dog breeding business.

'You're f***ing lucky that dog isn't here.'

Inspector Dave Williamson from Narellan Police Station later confirmed the footage had been collected for review, but said the situation was 'extremely unfortunate'.

'The family are dog breeders and they've got a reputable business, but they're dealing with live animals and dogs are pack animals,' he said.

'It's a tragic circumstance and situation.'

Initial reports said the dog was an American Staffordshire Terrier - a notoriously violent breed responsible for multiple attacks, including a tragedy in July when a five-month-old baby was mauled to death on the NSW Central Coast.  

But Daily Mail Australia can now confirm the dog was in fact a bullmastiff, which can grow up to 70cm tall, weigh more than 60kg, and are traditionally kept as guard dogs.

Anyone who owns a staffy in NSW is required to report the animal to the council, ensure it's de-sexed and display warnings out the front of their home if the pet is aggressive - but no such requirements exist for bullmastiffs.