
If you become a member of the Siberian Husky Club Of Great Britain or are already a member then we have a special board for members where you can ask your questions and will get answers from experianced mushers. www.siberianhuskyclub.com. (sorry can't do links)
I know people who run Border Collies in harness, also many other breeds akitas and pointers are also popular.
Different people start training their dogs are different agers, i know people who start at around 9 months, some don't even start till they are a year.
All the best.
Jenna