Authorities say a man working at a Southern California business was mauled to death by the owner’s four dogs. A 911 call about someone screaming sent Riverside County sheriff’s deputies to a property in Jurupa Valley, east of Los Angeles, at about 7:30 a.m. Tuesday. Authorities say the victim was attacked by three Belgian Malinois and a Cana Corso. His name wasn't immediately released. The county's Department of Animal Services say the man had been doing some work for the owner of a home that had been converted into a business, and he'd previously done work there without any problems. The owner wasn't present during the attack and later surrendered the dogs to be euthanized.