Dog sherrif is thrown

A dog leads a detective to a robber's hideout and fetches the police.

After exhaustive training, a police dog joins an arson investigation.

A rookie cop tries to prove his friend is innocent of a robbery, despite the police commissioner's objection to his use of a trained German Shepherd dog named Ace.

Ranger races to the rescue when Jim is framed on a murder charge.

A shoot out ensues when a criminal is revealed to be an undercover cop.