It happened Tuesday night at Mark Stinziano's Hewitt home.
Stinziano posted video on Facebook from his home security camera that captured the interaction between the black bear and Riley the dog. He said he had no idea what was going on.
"I was working in the garage. My wife was inside just watching TV, and the bear was back here having a snack," he said.
The video shows the bear pulling down Stinziano's bird feeder before Riley races in from the neighbor's yard.
The pup doesn't hesitate or show any fear, barreling into the bear at full speed and chasing after it until the bear was gone.
"Riley-1 Bear-0," Stinziano wrote on Facebook.
Riley's owner Alan Tlusty said this is business as usual for his courageous canine.
"It's incredible," he said. "He does chase after the bear whenever he sees him in the yard ... but not like this."
Stinziano said Riley always checks in on his kids when they're playing in the pool.
"Now he is keeping them safe!" he wrote.
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