A dog was shot by Daly City police Monday morning after it mauled a 30-year-old man, officials said.

Police responded to a report of a dog attack at 7 a.m. at a residence on the 900 block of Schwerin Street.

The canine was found assaulting the victim in a backyard and police shot the animal.

“Officers on scene, fearing for the safety of the injured male, fired their duty weapons to stop the threat,” Daly City police wrote in a news release.

The 30-year-old man was taken to a nearby hospital in critical but stable condition after first responders performed first aid.

Police did not say if the dog survived the attack. Investigators are interviewing the pet owner.

A Vallejo mother and her 3-year-old son were hospitalized Friday afternoon after three pit bull terriers attacked them.

Daly City police did not immediately return a request for comment.

Gwendolyn Wu is a San Francisco Chronicle staff writer. Email: gwendolyn.wu@sfchronicle.com Twitter: @gwendolynawu