AllMovie

The success of dog stars like Strongheart and Rin-Tin-Tin inspired a number of copycats (or should that be copydogs?). Peter the Great was one of those lesser lights, and as is usual with dog films, he's pretty much the whole show. Barbara Jane (Eleanor Boardman) is planning to elope with Jack (Raymond McKee). But, on the night he is to whisk her away, she is attacked by Phil (Earl Metcalfe), a boarder in her house. Her elderly stepfather (Paul Weigel) hears her cries and comes to her aid, but Phil shoves him down the stairs and kills him. He escapes just before Jack arrives. Circumstances point to Jack as the killer and he is arrested. But his dog, Peter, saw the chain of events through a window and he knows who the real murderer is. While Jack is in jail, Peter wins the warden's trust and is able to pass notes from Barbara. Then, when Jack escapes, Peter holds the guards at bay. Jack, Peter, and Barbara cross the Mexican border and find Phil. Peter chases Phil down and guards him until the police can hear his confession.