Jules, a 9 kg Bulldog, took her guard dog responsibilities seriously when the bears approached her family's property in Monrovia in California.
When two bears managed to make it into the garden in broad daylight, Jules responded - running at the bears, which were five times her size, without hesitation, and barking at them until they fled.
"It blew me away, I couldn't believe that she turned into a wolverine," homeowner David Hernandez was quoted as saying by the CBS LA.
Two bears - believed to be about a year-old each - wandered into the family's front yard. A third bear was on the balcony, just out of range of the camera.
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Jules was rewarded for her courage with a bath, treat and plenty of affection from her grateful owners.
Hernandez said a wildfire in the area has affected the food supply in the the foothills for the bears - meaning more have been coming down in search of food.