His wife ran into the home as the bear killed the family dog and took her into the yard.
The attack came two days after Rick Mann encountered a bear and two yearlings in his garage. FWC believes the same bear was involved in both attacks.
When his 5-year-old Maltese-Yorkie mix, Reese, barked, the bear attacked, clamping down on the dog twice.
"When she came back the second time, I grabbed whatever I could," Mann said. "There was a vacuum cleaner there. I started swinging at her."
Reese underwent five hours of surgery.
"He's got seven puncture wounds, a bruised liver, a bruised kidney, numerous lacerations," said Roxane Mann, Rick Mann's wife. "Just a lot of issues. But he's hanging tough."
Roxanne Mann said the bear opened the refrigerator in the garage and helped herself to the food it contained, showing no fear of humans.
"The fact that she was starting to leave the garage and then came back to attack for the second time was very uncommon for a bear," Rick Mann said.
Word is spreading about the brave dog that stood up to the bear to protect his owner. The veterinarian who has been treating Reese has collected more than $1,000 in donations to help pay the vet bills.
FWC said area residents should keep their garage doors closed, not leave food outside and keep dogs on a leash.