Lawyers for the B.C. SPCA will be in a North Vancouver courtroom Friday fighting for the release of documents detailing the mass slaughter of 100 healthy sled dogs in Whistler.

The non-profit animal welfare agency is leading the investigation into the incident, which prompted B.C. Premier Gordon Campbell to call for the creation of a task force to probe the deaths.

The SPCA obtained a court order for WorkSafe BC's file on the case, but the compensation board sought an exemption, saying it can't release confidential records.

The agency said it was a leaked version of a compensation claim that prompted an investigation into allegations that former Howling Dog Tours owner Robert Fawcett shot and stabbed the dogs to death before dumping their bodies into a mass grave.

Documents paint a graphic and disturbing slaying scene, where some animals wandered around with half their faces blown off after surviving being shot in the face.

The SPCA is only looking to have documents released that relate to the killings, manager of cruelty investigations Marcie Moriarty told ctvbc.ca.

"We don't care about his medical records. We're not trying to invade anyone's privacy. The hope is we get all relevant records that can help in the investigation so we can find out exactly what went on," she said.

A representative for WorkSafe BC said the board will hand over the documents if the judge orders it.

A joint statement issued by Outdoor Adventures and Fawcell said the sled dogs were slaughtered because many were not adoptable and either too sick or old.

The statement also says that there had been "considerable" effort to get the dogs adopted, but "the efforts at adoption were not as successful as hoped."

Meanwhile, the RCMP say they're concerned about an increasing amount of threats made against people connected to Outdoor Adventures Whistler and Howling Dog Tours.

Sgt. Peter Thiessen said the allegations have touched a nerve across the country but "no one has the right to threaten to harm or kill someone they suspect could have been responsible or involved."

The threats, some described as "very graphic," have been made face-to-face, by phone and through social media websites.

The claimant was granted compensation for post-traumatic stress after he says he was ordered to shoot the pack in April 2010. Online comments by a man calling himself Bob Fawcett on a forum about post-traumatic stress disorder say he was told the company would fold unless the dogs were killed.

"I was forced to kill and it has pretty much destroyed my soul," a Dec. 27 post under the same name alleges.

"I have done the worst of the worst for the wrong people. I have been used to do things normal humans cannot even think of."