Boomer later found the suspects sweatshirt, the DNA was tested and now he is going to prison.
After a long a successful run, Guse knew it was time for Boomer to turn in his vest.
"It was something I'd never thought I'd see... They always say when the dog gets up and kind of looks at you like I do not want to jump in that car and go to work today then you know it's time to retire them," said Guse.
Guse said 11-year-old Boomer doesn't have a go get em attitude anymore and also has some health issues.
Boomer's last day ended with a party, complete with cake. Friday was a bittersweet ending to a job well done.
"It's going to be sad to see him go, but it's time for him to start enjoying some regular life," said Guse.
Boomer will live with Officer Guse and his family. A new K9 Officer starts in Glendale in the fall.