This is the first time the event has been held on snow in 15 years
Competitors in a Highlands dog sled rally are racing over a snow-covered course for the first time since the mid 1990s.
Siberian Husky Club of Great Britain spokeswoman Judy Wakker said the weekend event near Aviemore was an "amazing opportunity" for mushers.
"The atmosphere is amazing, it's buzzing," she said.
The Cairngorms experienced some of the heaviest snowfalls during the recent prolonged spell of severe weather.
Teams of Siberian huskies, Alaskan malamutes and Canadian Eskimo dogs are racing round a four-mile track on sledges instead of the usual wheeled rigs.
Ms Wakker said more than 200 competitors and more than 1,000 dogs were taking part.
"It's the first time we have run the sleds on snow for 15 years," she said.
"To get the opportunity to run sled dogs on snow in Scotland is amazing.
"Normally you have to go to the Alps in France and Germany to get the opportunity to run on snow."
Mrs Wakker said 2,000 to 3,000 spectators watch the annual event.
One of the event organisers, Sarah Robinson from Watford, said the race, which was attracting competitors from across the country was considered to be "one of the most challenging and prestigious of the Siberian Husky Club's series of rallies".
The event, held on Saturday and Sunday, was first staged in 1984.