Some importent words about training and working performance in the harness, by Karsten Grønås, kennel Vargevass, Sweden, from the English Siberian Husky book, 2002.
"Working performance in the harness, should be good, they should be very concentrated and very serious towards their work."
"Endurance and speed are elementary in a sleed dog, I fell. They have to be mentally strong so they can handle the great amount of training which is put on them. I like dogs who are calm, but yet happy to go out on whatever trip I take them. They should be able to go on even when the going gets tough."