Dog Sledding? Don't worry.
I was able to identify 3 mini tours for dog sledding fans.
Take a look:
Dog Sledding Tour: half-day/1day in Minami Furano (South Furano) town:http://h-takarajima.com/detail/index/422
Just move from Sapporo to Tomamu station by limited express train. They are waiting for you. The best Dog Sledding tour for you.
Dog Sledding Tour near Asahikawa:http://h-takarajima.com/detail/index/1597
this is a tour in Takasu town (near Asahikawa city)
It's rather easy to move from Sapporo to Asahikawa, because both cities are rather large.
Exchange once again at the Asahikawa station, and move by local bus to a nearby station.
They are waiting for you at the bus station.
Dog Sledding Tour plus Travel by the legendary steam locomotive in Kushiro:http://h-takarajima.com/detail/index/1242
Kushiro is a rather distant place from Sapporo (about 300km east of Sapporo),
so take this tour as the 3rd option (not the best option).
You can find other activity tours (including all seasons) at:http://h-takarajima.com/search&area1_id=&area2_id=&genre1_id=39&genre2...
To find a winter activity tour, select "Winter Specialities" on the Activities menu and click the "Search with These Settings" botton.
It's still too early to apply for winter activity tours, so wait for several months and check to see if there are any changes on these Web pages.
If you have more questions, ask me freely.