Why do dogs drool? Drooling can be normal in some dogs, especially some breeds such as Great Danes or Basset Hounds.
Excessive drooling can occur in any dog and can be caused by a variety of reasons. For example, some dogs may drool when they smell certain foods or are excited. Other dogs will drool if they are nauseated or have an oral abnormality such as a dental problem or something caught in their mouths.
Ptyalism is the term used to describe excessive salivation or drooling. For more information, please read Ptyalism