Dag René Burgos Spangen was born on 21 October 1966. His older brother is fellow cross-country skier Ricardo Burgos.[1][2] They were born to a Norwegian mother named Bertha and studied in Norway.[3]
Guatemala would compete at the 1988 Winter Olympics in Calgary, Canada, for their first appearance at the Winter Games.[4] Dag and his brother would compete and represent the nation at these Games, competing in two cross-country skiing events at the Canmore Nordic Centre Provincial Park.[5][6]
Both of them would first compete in the men's 30 kilometre classical event on 15 February 1988 in a field of 90 competing athletes. There, Dag would place 80th out of the 87 competitors that completed the course. He would finish with a time of 1:47:38.5, 23:12.2 away from winner Alexey Prokurorov of the Soviet Union.[6] He would then compete in the men's 15 kilometre classical event four days later on 19 February 1988 in a field of 90 competing athletes. There, Dag would place 80th out of the 85 competitors that completed the course. He would finish with a time of 53:00.8, placing just above his brother. The winner of the event would be Mikhail Devyatyarov of the Soviet Union who had finished with a time of 41:18.9.[5]