Police of the province's Vinh Tuong District detained Son on Saturday on charges of involuntary manslaughter. Son, a relative of the victim, lives just 50 meters away from the girl's home.
The dogs, a male and a female, were fed rice and cornmeal and had been vaccinated. On Wednesday evening, Son let them outside without muzzles after feeding them.
At approximately 7:45 p.m., the child was playing near her home when the dogs attacked her, biting her neck and abdomen. Despite being rushed to the hospital, the girl succumbed to her injuries.