This happened in New Jersey, when the dog by the name of Curry was walking with its owner.
When Curry suddenly began to bark and ran up the bear chasing him.
"He has been doing this for 5 years or more, this is his job. We have children and he has stopped a lot of bears and coyotes.This dog saved my children and some others many times for being on guard." - says the owner of the dog.
More info: youtube.com