Dogs rest during the Sedivackuv Long dog sled race in Destne v Orlickych horach January 23, 2015. Each year, racers from all over Europe arrive at the village of Destne in the Orlicke mountains in Czech Republic to take part in the race. (Photo by David W. Cerny/Reuters)

A musher greets his dog during a break in a stage of the Sedivackuv Long dog sled race in Destne v Orlickych horach January 22, 2015. (Photo by David W. Cerny/Reuters)

A dog rests during a break in a stage of the Sedivackuv Long dog sled race in Destne v Orlickych horach, January 22, 2015. (Photo by David W. Cerny/Reuters)

Dogs rest during a break in a stage of the Sedivackuv Long dog sled race in Destne v Orlickych horach January 22, 2015. (Photo by David W. Cerny/Reuters)

A dog rests during a break in a stage of the Sedivackuv Long dog sled race in Destne v Orlickych horach, January 22, 2015. (Photo by David W. Cerny/Reuters)

A musher greets his dog during a break in a stage of the Sedivackuv Long dog sled race in Destne v Orlickych horach January 22, 2015. (Photo by David W. Cerny/Reuters)

A musher greets his dog during a break in a stage of the Sedivackuv Long dog sled race in Destne v Orlickych horach January 22, 2015. (Photo by David W. Cerny/Reuters)

Dogs rest during a break in a stage of the Sedivackuv Long dog sled race in Destne v Orlickych horach January 22, 2015. (Photo by David W. Cerny/Reuters)

Dogs wait for the next stage of the Sedivackuv Long dog sled race in Destne v Orlickych horach January 22, 2015. (Photo by David W. Cerny/Reuters)

A musher takes care of his dog during a break in a stage of the Sedivackuv Long dog sled race in Destne v Orlickych horach, January 22, 2015. (Photo by David W. Cerny/Reuters)

A musher takes care of his dogs during a break in a stage of the Sedivackuv Long dog sled race in Destne v Orlickych horach, January 22, 2015. (Photo by David W. Cerny/Reuters)

A dog looks out of its cage before the Sedivackuv Long dog sled race in Destne v Orlickych horach January 23, 2015. (Photo by David W. Cerny/Reuters)

A musher rides his dog sled during a stage of the Sedivackuv Long dog sled race in Destne v Orlickych horach January 23, 2015. (Photo by David W. Cerny/Reuters)

A musher rides his dog sled during a stage of the Sedivackuv Long dog sled race in Destne v Orlickych horach January 23, 2015. (Photo by David W. Cerny/Reuters)

A musher rides his dog sled during a stage of the Sedivackuv Long dog sled race in Destne v Orlickych horach January 23, 2015. (Photo by David W. Cerny/Reuters)

A dog rests during the Sedivackuv Long dog sled race in Destne v Orlickych horach January 23, 2015. (Photo by David W. Cerny/Reuters)

A musher carries his dog to a veterinary station before the Sedivackuv Long dog sled race in Destne v Orlickych horach January 23, 2015. (Photo by David W. Cerny/Reuters)

A musher rides his dog sled during a stage of the Sedivackuv Long dog sled race in Destne v Orlickych horach January 23, 2015. (Photo by David W. Cerny/Reuters)