I went through something similar a few years ago. At the suggestion of a friend, we spent a weekend conditioning our dog. Starting Saturday, we would leave the house for relatively short durations, first taking walks around the block. Don't make a big deal when you leave or on your return. By lunch time, we started leaving by car (this seemed to be a big trigger with her). Same technique, short duration leading to longer trips. Sunday morning, we went through our normal work routine and left the house for nice bfast. Spend the day running errands back and forth to the house. By Monday, she was greatly improved.
This sounds like my take on it. Also is the dog bonded to one person? I've worked with german shepherds that are so intensely bonded to one owner that this becomes a problem.
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