A 16-year-old boy accused of killing four dogs has been remanded in custody after prosecutors raised concerns he would hurt humans.
The ACT Children's Court this morning heard how police found an iPad with a "bucket list", referring to "killing someone" when they searched the teenager's home.
The boy, who cannot be named, has been charged with two counts of aggravated cruelty to animals relating to the deaths of a Rottweiler and cross-breed between November and this week.
But police believe he is also responsible for the death of two more dogs.
According to a statement tendered in court, the boy showed friends a disembowelled dog beside a walking track in January.
It is alleged he told them he snatched the dog from a backyard before strangling it.
This month he allegedly showed friends a mobile phone video of a dog running and on fire.
Police found three dead dogs at a site in north Canberra yesterday.
"Police suspect that further dogs will be located in the area," the court document states.
Magistrate Karen Fryar ordered a forensic mental health assessment report be prepared and marked the boy a detainee at risk.
Prosecutor Michael Clark said police held fears the teen might reoffend, interfere with witnesses or tamper with evidence.
But defence lawyer Michael Toole said the last concern was unfounded because police were presumably still searching the vacant north Canberra block where the bodies were found.
He suggested a curfew could allay fears of reoffending.
The court heard the boy was also allegedly seen pulling down fence palings in the early hours of the morning at the home of a Canberra teacher.
He allegedly told the teacher he was researching a biology assignment involving dogs.
And an anonymous source told police the boy had later threatened to burn down the teacher's home.
"I have to say that the [alleged] facts of this matter are some of the most concerning facts that I've seen for a long time," the magistrate said.
"I agree that there are concerns about whether [the accused] would reoffend if released on bail."
She also said she had real concerns for the young person's well-being.
The court heard that the teen had no prior criminal convictions.
The boy was remanded in custody, and is due to reappear in court next month.
His mother was present for the court proceedings.