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Chicago, IL.  --  A 4-year-old boy, reportedly a foster child, was mauled to death by a Rottweiler Sunday afternoon in his foster family-s Southwest Side backyard. The boy was found dead in his backyard at 3819 W. 61st St. at 3:18 p.m. after being mauled by a Rottweiler, according to Fire Media Affairs Asst. Director Eve Rodriguez. Alex Angulo, of the 61st Street address, was taken to Holy Cross Hospital where he was pronounced dead at 4:14 p.m., according to a spokesman for the Cook County Medical Examiner's office. Police responding to the scene found more than one dog at the home although only one is believed to have attacked the boy, police News Affairs Sgt. Antoinette Ursitti said. Angulo was reportedly attacked by his foster uncle-s dog, according to a source. The grisly attack left the boy without part of his leg.   The Illinois Department of Children and Family Services is investigating Alex's death, according to spokesman Jimmie Whitelow, who said DCFS has not had prior contact with the family. Whitelow was not able to comment Sunday night whether there were any other children in the home at the time of the attack.   Wentworth Area detectives were probing the attack Sunday night, but would not confirm whether charges would be filed. An autopsy for Angulo is slated for Monday.