From two earlier links:

"Brush said he wears a pistol on his walks because bears have chased his dogs in the past.

He drew a Ruger .454 Casull revolver. There was no time to aim, barely time to squeeze the trigger. He's not sure whether he got off two shots or three, but one proved fatal.

"Total luck shot," he said.

"It doesn't get any closer. He slid by me on his chin when I shot him," Brush said. "I was backpedaling as fast as I could. I wasn't even aiming. I tripped over my own feet as I pulled the trigger." "

Read more here: http://www.adn.com/2009/08/13/897940/twig-snap-alerts-dog-walker-to.html#storylink=cpy