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EC: Helpful Websites
http://www.metpet.com/Reference/Dogs/Health/dog_drooling.htm
http://www.associatedcontent.com/article/46491/decrease_your_dogs_excessive_drooling.html
http://www.ehow.com/how_2251674_diagnose-excessive-drooling-dog.html
For sudden, excessive drooling: http://answers.yahoo.com/question/index?qid=20061007172953AAD3q1d