Kuczero didn't consider the possibility that a grizzly bear tugging at the nylon woke him.
He figured it had to be a dog he heard outside in the 4:30 a.m. stillness...
http://ap.peninsulaclarion.com/pstories/state/ak/20060730/75625003.shtml
Funny thing about that is I had a Newfoundland check out my campsite one night, and in the dark, I thought he was a bear... till he panted :~)