Ranger is a golden retriever who has been trained as a search-and-rescue dog. In this adventure, Ranger travels to the Colosseum in ancient Rome, where there are gladiator fights and wild animal hunts Ranger befriends Marcus, a young boy Ranger saves from a runaway lion, and Quintus, a new volunteer gladiator who must prove himself in the arena. Can Ranger help Marcus and Quintus escape the brutal world of the Colosseum?

Ranger is a time-traveling golden retriever with search-and-rescue training. In this adventure, he goes to a Maryland plantation during the days of American slavery, where he meets a young girl named Sarah. When she learns that the owner has plans to sell her little brother, Jesse, to a plantation in the Deep South, it means they could be separated forever. Sarah takes their future into her own hands and decides there's only one way to run -- north.

Ranger, the time-traveling golden retriever with search-and-rescue training, joins an early twentieth-century expedition journeying from New Zealand to Antarctica. He befriends Jack Nin, the stowaway turned cabin boy of Captain Robert Falcon Scott's ship. They're racing against a rival explorer to reach the South Pole, but with unstable ice, killer whales, and raging blizzards, the journey turns into a race against time... and a struggle to stay alive.

Ranger is a time-traveling golden retriever with search-and-rescue training. In this adventure, he goes to Viking age Iceland, which proves to be tough terrain for Ranger to navigate. Usually it's Ranger's job to save the day before he can return to his family, but he meets a girl named Helga who rescues him more than once. And when a nearby volcano threatens to erupt and Helga's new baby brother or sister starts to come early, they must journey through ash and smoke to find Helga's father. But if Helga doesn't need Ranger's help, how will he ever get home?

Ranger travels to San Francisco and meets Lily Chen. She was sent from China to America to work as a young servant, but she dreams of studying to be a doctor. When the Great Earthquake hits, Ranger arrives in time to rescue Lily from falling beams in the mission house where she lives. Together they flee to safety, stopping to help another girl, May Wong, save her little brother from the family's collapsed market. Lily and May try to make their way through the ruined city with Ranger at their side. But can they escape crumbling buildings and raging fires, all while facing anti-Chinese...

Ranger, the time-traveling golden retriever with search-and-rescue training, sets out to help a girl find her family in New Orleans during Hurricane Katrina.

Ranger, a time-traveling golden retriever with search-and-rescue training, heads to Normandy on the morning of the D-Day invasion where he meets Leo, a Jewish boy who is hiding with a local farmer, and Walt, a young American soldier fighting to free France from the Nazis. Illustrations.