[navillusc]

If she was kennel kept in a puppy mill or farm, it may be 'habit' since she likely didn't have much space to herself. If there are no health or neurological issues, maybe taking her on walks in straight lines and non-circular patterns may help, and engage her as much as possible so she has little time to herself for now.

The dog in the video looks to me to be bored/stressed/nervous and that may be why it is pacing in the circular pattern quite redundantly. There is something called 'muscle memory' which may be partly to blame. She may well come out of it within a month or less, depending on how much distraction she receives. The video looks like the circling dog just changed 'cage' homes and is reacting to the new one with the same old habits from the previous home.

The circular pacing may also be a 'personal comforting' activity...to keep herself from 'thinking' about her situation...a 'metronome' sort of thing. People are known to do this as well.

I am no expert, so this is only a meager opinion. lol I truly hope she is healthy, and there is nothing wrong...that she is just in an adjustment period that will soon end. Your friend is wonderful to take her...please give her my best regards.