"I thought it was ideal because it gives him the message that I want to send, and it's a really intimidating-sounding song", she told the outlet.
It turns out big cats are not fans of heavy metal.
The animal started creeping toward them, and Gallant realized it was a cougar when it was about 50 feet away.
Dee Gallant and her dog Murphy were hiking through the wilderness of Vancouver Island in British Columbia last week when she found herself in a spine-chilling predicament. They are considered "spot and stalk" hunters and have extremely good vision.
About the song, Gallant said: "I thought it was ideal because it gives him the message that I want to send, and it's a really intimidating-sounding song".
"I looked over to the right and there it was, I couldn't make it out at first and thought 'oh that is a unusual color, that's not a tree, '" she recalled. "It was crouched down, doing that kind of prowl, predator walk that they do - that was when I waved my arms and yelled 'hey, you stop!' and it did". "I looked over to the right and there it was, I couldn't make it out at first and thought 'oh that is a odd colour, that's not a tree, '" she said.
The incident lasted a total of five minutes - "I actually thought it was really cool that I got to see a cougar for so long", she said. As soon as he heard the first note, he bolted.
Gallant told Kelowna Now that she was about two kilometres deep into the trail when she saw something unusual in the distance.
Gallant kept the song on loop for the rest of her hike, making sure to stay in the middle of the road, keeping Murphy close and continuing to stay alert.
"I would love to contact them someday and tell James Hetfield [Mettalica's lead singer] that he saved my life", she laughed.