Help… Lost White Dog in Gallatin Canyon!

Missing - all-white shepherd mix! Sadly no collar or leash on, but he is microchipped.
His name is Karma, very friendly.
Located in Canyon by Montana White Water Rafting/Storm Castle.
Please be on the lookout.
Still missing as of Monday morning.
Installed new door lock and door jam after previous escapes this month and he found a new exit out of cabin.
We were in town for 4 hours and returned home to door open and pup gone so unsure on afternoon timeline.
We are frantically looking.
Call Logan with any details, please!! No questions asked, we just want our buddy back.