MILFORD — A day care center where a teacher allegedly dragged a 3-year-old boy across the floor by his arm — then tried to manipulate it back into its socket while the child “agonized” in pain — has been sued for negligence.

The boy’s mother filed the lawsuit in August against Good Child Development Center and Tammy Gosney, an employee who was arrested and fired after the June 27, 2018, incident.

Gosney was charged with risk of injury to a minor in the case.

According to court records, Gosney’s criminal case has been sealed and continued to next October.

Messages were left with the lawyers involved with the lawsuit Friday.

A lawyer representing Gosney and the daycare has asked a judge to throw the case out of court because the lawsuit allegedly wasn’t served in time.

A hearing on a request by the plaintiffs to use pseudonyms in court filings has been scheduled for Oct. 28.

The mother and boy are identified as Sara and John Doe in court papers.

The lawsuit says the boy was in Gosney’s preschool class at Good Child Development Center.

On June 27, 2018, the lawsuit says, Gosney “physically abused the minor by dragging him by his arms several feet across the floor” at the day care center.

Afterward, the lawsuit claims, Gosney “attempted to manipulate the shoulder/arms of the minor back into socket, all of this while the child agonized in pain.”

The boy has “suffered extreme trauma, mental anguish, and psychological injuries, which are permanent in nature,” according to the lawsuit. “Tammy Gosney has disrupted and destroyed forever and for all time the minor’s childhood and adolescence.”

The lawsuit accuses Gosney of intentional, reckless and wanton assault, and the day care center of negligence in its hiring and supervision of her.

It seeks monetary damages, interests and costs of at least $15,000.