The body of the 29-year-old woman who ran her own dogs at the time of the attack was found on Saturday in the forest of Retz off the northeastern village of Saint-Pierre Aigle.
An autopsy found that the woman had died from "bleeding from multiple dog bites to the upper and lower limbs as well as the head," prosecutor Frederic Trinh said in a statement on Wednesday, the prosecutor said.
The woman's partner said she had gone for a walk with her dog and later phoned him to report the presence of threatening dogs, Trinh said.
"I went into the woods, saw them in an SUV, looked for them and met some hounds, a rider, and then I called (our dog) Curtis, and that warned me Curtis Bellen ", said Christophe identified partner of the wife to the CNN daughter BFMTV.
"I headed for the abyss, the gorge, I saw thirty dogs arrive, so I moved away," Christophe told BFMTV.
The man told BFMTV that he found the body of his partner, who had been stripped and bitten all over.
Investigations are underway to determine which dogs have attacked the woman.
Officials confirmed in a statement that saliva samples were taken from 67 dogs, including dogs belonging to a nearby organized hunt, as well as those from the victim's dogs.
The organization stated that the society's 30,000 dogs are trained to hunt wild animals and obey humans in all cases, and that all dogs in the hunting party had undergone salivary tests.