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					Originally Posted by  TLC     This is really bizarre...   
Maybe you should have bloodwork done and also a Bile Acid test as well...Something 'funky' may be going on..   
My Roxy has anxiety issues and they cause her to do 'laps' too, but not for hours at a time, it's only for minutes when she is under dire stress (in her mind at least)...   |  
 
  I agree. Its sound slike there is something medical going on. I think a trip to the vets for a check up would be a good idea, and if thats all clear, i would treat it as an obsession.