After a family dog attacked a four-year-old boy Monday afternoon, Denison Police say the owner is expected to relinquish the animal to the city’s custody to be euthanized.

At about 1:02 p.m. Monday, police and animal control officers responded to a dog bite call from the 900 block of West Morton Street. Denison Police Lt. Mike Eppler said the family’s dog, a pit bull and labrador mix, attacked the child unprovoked.

“The dog was chained up and the child walked up either to pet it or something, and the dog just attacked him — attacked the little boy,” Eppler said.

The dog was outside the residence, and Eppler said a family member ran over and got the dog off the child. The dog bit the boy on the head, and he was transported to the Texoma Medical Center then transferred by air ambulance to Children’s Medical Center of Dallas.

Eppler said the family told police Tuesday morning that the child underwent surgery, but he is expected to be OK. Eppler noted the boy will be in the hospital for a while.

The owner of the dog turned custody over to animal control officers, and Eppler said the owner was expected to sign an agreement with the city on Tuesday afternoon. After the agreement is signed, the city will take possession of the dog and euthanize it.