Yes they are but not all shacks, our friends stayed in a grain bin aND brought their furbaby, the reservations site will tell you which ones are pet friendly, we had so much fun at NYE party
They do allow pets in certain rooms, but NOT in The Sky Shack!
I don't know. Check their website. I think for an extra fee they are dog friendly.
Info at website
Unfortunately I don't know. We traveled with no pets but I guess they are pet-friendly, might be a little bit of extra to be paid but the place is one of the best we have ever stayed at. The amosphere, the vibe, the area, the air is filled with the blues :)
Get an answer from Shack Up Inn staff and past guests.