A 4-year-old Michigan boy was fatally mauled by a pit bull that the boy’s parents were dogsitting for on Tuesday, his family said.

“We experienced a family’s worst nightmare when a dog took the life of Benjamin,” his family said in a statement following the horrendous attack inside their Detroit suburb home.

The dog, which the family said has “never shown aggressive behaviors” left the youngster with neck and body injuries, according to WXYZ. He was declared dead at a nearby hospital.

Benjamin’s sister called 911 as her brother was being attacked, the report said.

The boy’s mother, who was also injured, tried desperately to defend her son, even stabbing the dog with a knife in a bid to stop the mauling.

Police were finally able to separate the dog from the boy by deploying a taser on the animal, the network reported.

The dog fled the home and was later found. The animal was then euthanized by a vet.

A GoFundMe was set up for the family, which as of Wednesday night, had raised nearly $20,000.