I just noticed you mentioned a dog-sled ride. Be aware that there are 2 types...one involves a helicopter to a part of the glacier with a bed of snow...the other involves an apparently rough ride on a dirt/gravel trail. Be certain of what you reserve.
We spoke to many who did the glacier version of the trip and loved it. They do this out of Juneau (and Skagway) and at some places in the interior. Last I heard, the warm summer had caused enough of a snow-melt that they had to close up shop in Juneau in mid-August (but maybe that's wrong). I'd check into it and have a back-up plan.