NEW HOPE, Ala. -- An Alabama mail carrier has been charged after authorities say she fed at least one dog meatballs that contained nails.

AL.com reports that 47-year-old Susanna Dawn Burhans was arrested Thursday and charged with aggravated cruelty to animals.

The U.S. Postal Service worker was arrested after a joint investigation by the Madison County Sheriff's Office and the Postal Service determined she fed the nail-laced meatballs to at least one dog in New Hope.

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Ed Glover of New Hope told CBS Huntsville affiliate WHNT-TV that he found one of the meatballs on the ground by his mailbox. He became worried about his dog Missy, and X-rays later showed that nails were inside the dog's stomach.

Glover told the station that Burhans was his mail carrier.

Sheriff's Capt. Mike Salomonsky says the investigation began with a complaint nearly two weeks ago, but at least one other resident has filed a complaint.

Further details haven't been released. It's unclear if Burhans has an attorney.

She was released from the Madison County Jail after posting $2,500 bail Thursday.