Lindbergh's Dog Wahgoosh

Why didn't the Lindbergh family dog bark? Anne and the household staff admitted the dog always barked at strangers, but Lindbergh gave somewhat muddled testimony at Hauptmann's trial that Wahgoosh, their terrier, wouldn't be expected to bark. Why the differing opinion?
by Ronelle Delmont

Ronelle Delmont:  Lindbergh Kidnapping