CHICAGO (CBS) — Four people and their family dog were stabbed early Wednesday, when two masked men broke into their home in north suburban Buffalo Grove.

Police said the homeowner grabbed a handgun during the home invasion, and opened fire, chasing off the suspects.

Just after midnight, police responded to a home invasion in the 400 block of St. Marys Parkway, and found several windows had been broken, and the front door had been forced open. Officers discovered a bloody scene inside.

Witnesses told police that two masked attackers had broken in, and a man armed with a large hunting knife repeatedly stabbed the 49-year-old homeowner. Three other people and the family’s German Shepherd also were stabbed.

During the struggle, the homeowner retrieved a handgun, and opened fire, causing the attackers to run away.

“It’s pretty shocking,” neighbor Bob Meyer said. “This neighborhood is very, very quiet. We’ve lived here for 30-plus years, and this stuff just doesn’t happen here; just doesn’t happen.”