I unfortunately know more about the Finnish side of Lapland. I play with sled dogs every winter. I know there is few places in Rovaniemi, but they are mosty hour trips. Multiple day safari is quite expensive.
The only link I know of in Sweden is http://www.huskysafari.com/eng/contact.htm but I haven't been dealing with them at all.
For the longer traveling, you might want to wait for the spring when the dogs are more trained and the snow is harder.