@Ben3185 A quick review of your profile and the house and it is obvious that you are not an on-site, or even local, host. Do you have someone in Vermont that can "check in" on the guests? Why did you agree to two more people than your published maximum? Do you have blankets and/or towels for cleaning off the dogs after they have been for runs in the snow and mud?
Since you don't want to cancel, and it doesn't sound like they have given you a reason, I would kill them with kindness leaving them 10 human and 3 canine treats with a festive holiday card.