More trending stories
The dog, Jango, has been with his K-9 handler, veteran Rialto police officer Mike Mastaler, for two years.
Just before the attack, Mastaler let the dog out and went upstairs to change clothes, he said. His son apparently went out the back door, looking for his mother.
By the time Mastaler heard what was happening and ran outside, the neighbors had just pulled his son away, and he put Jango in his kennel.
Jango has since been quarantined, and police Capt. Randy DeAnda said the department has to decide whether to put the dog down.