Samuel Zamudio of Colton died Monday evening, and an uncle and his grandmother were arrested on child endangerment charges, the Los Angeles Times reported. Eustulia Zamudio, 42, and Marco Zamudio, 23, are to appear in court Wednesday.
Samuel's body was found in the back yard of the family's home. His clothes had been ripped off and he had "extensive wounds to the upper body," Colton police said.
The boy's uncle was responsible for him, and the grandmother owned the dogs and the home where the attack took place, police said.
Five adults and three children lived in the home, the Times said. Besides the five dogs involved in the attack, there were two others fenced in the front yard, the newspaper said.
Police said the five dogs that attacked the boy were taken to an animal shelter and would likely be euthanized.
The California mauling came a day after a 2-year-old boy was fatally attacked by three pit bull mixes in Gilbert, Ariz. No charges had been filed in that case.