A. This is a bit unusual but I have seen a case like this before. It was stemmed from a neurotic behavior (being compulsive) and is something that training can usually help. I am not sure why it occurs, could be vision related perhaps so always first rule out any medical issues. I would seek the help of a trainer with this. You will need to work on redirecting the dog when walking (maybe focus on you, teaching "watch me" or a toy). I would be available to help with this on a private consult if you like.
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