A teenager accused of assault and arson was sentenced to probation and jail Friday.

Pima County Superior Court Judge Brenden Griffin sentenced Robert Lee Jones, 15, to six months in the county jail and five years’ probation after a guilty plea to attempted arson of an occupied structure and aggravated assault on an incapacitated victim.

Jones, who was 14 at the time, was arrested in January 2013 on suspicion of arson, burglary and criminal damage in connection with a break-in and fires set to vehicles at a day-care facility.

Police used a service dog to trace Jones from the day-care facility and later arrested him at his mother’s house.

While incarcerated in Pima County jail, Jones assaulted a fellow inmate who was handcuffed to a table at the time.

Jones pleaded guilty to that charge as well. He was sentenced in both cases on Friday.

Griffin told Jones that punishment options would soon be exhausted other than prison for the juvenile offender.

He warned Jones to not squander the opportunity to change the direction of his life.

“You’ve got the power,” Griffin told Jones. “You can make all the choices.”

Jones said he realized he had missed the opportunities he was given in the past and said he planned to make the most of this one.

“This has gotten my attention,” he told the judge.

His attorney told Griffin that his client had grown up since his arrests and spending nearly a year in jail.

Contact reporter Patrick McNamara at 573-4241 or pmcnamara@azstarnet.com. On Twitter @pm929.