Matrix, a 15-month-old Belgian Malinois, looks back at his handler, Officer Joshua Robinson of the Yarmouth Police Department, while traversing an obstacle course during a demonstration following their graduation from police training in Vassalboro on Friday.

Matrix ushers in a second era for Yarmouth police, whose first police K-9, Sultan, retired in 2012 and had to be euthanized at age 10 in 2015 after nearly a decade of service.

Matrix has been living for months with the family of his handler, Officer Joshua Robinson of the Yarmouth Police Department.

Matrix chills during his graduation from police training.

Officer Joshua Robinson praises Matrix during a demonstration following their graduation from police training.

Matrix gets lots of pats from officers of the Yarmouth Police Department after the 15-month-old Belgian Malinois graduated from police training on Friday.

Officer Joshua Robinson of the Yarmouth Police Department loads Matrix into a cruiser after their graduation from police training.

Matrix at 10 weeks old during his early training with Jay Cooley, a Maine State Police dog handler.

Matrix at 4 months, before he grew into his ears, while training with Jay Cooley, a Maine State Police dog handler.