I would agree with Sharron on this one, with one exception. If this is truly OCD (Which some dogs do have). Then I would reccomend the behaviorist first, and the meds only as a secondary if needed. A good amount of dogs who fixate on things to an obssesive point do quite well with redirection training. The sooner you can see a behaviorist the sooner you can start practicing redirection techniques. Good luck, and keep us posted.
--Charlie the Parson Russell Terrorist
--Zaire the Basenji Ninja
Daniel the human stuck in the middle
B.R.A.T. Basenji Rescue And Transport
Russell Rescue Inc.
"He cannot be a gentleman that loveth not a dog." - Old English Proverb