Size matters? Yeah, right.

Check out this 20-pound French bulldog named Jewels that did a bang-up job scaring away two 100-pound bears that showed up at a house in Monrovia, Calif. last Friday.

The homeowner was stunned by Jewels' actions. He said, "[It] blew me away. I couldn’t believe it...she turned into a wolverine."

It looks like this homeowner has the best security system he'll ever need.