Seaman, the Newfoundland dog belonging to Meriwether Lewis, keeps an account of their adventures during the journey to the Pacific.

A 150-pound Newfoundland dog teams with Lewis & Clark for an edge-of-your-seat middle grade adventure. It is 1804, the year that Meriwether Lewis, William Clark, and the Corps of Discovery set out for their now-legendary exploration of the Louisiana Purchase. With no maps and little idea what wonders and dangers lie ahead, Seaman, a 150-pound Newfoundland dog, proves to be one of the most valuable members of the Corps. In the face of starvation, Seaman catches and retrieves game, and his intimidating size and teeth protect the small band of explorers – from Native American raiders and even a ferocious grizzly bear! As the bond and mutual trust between Seaman and the Corp grows, they're confident that nothing—not even raging waters and towering mountains—will stop them from reaching the West Coast. This thrilling fictional account of Lewis and Clark's expedition with the Corps of Discovery, Seaman, and eventually Sacagawea, is full of accurate details drawn from Lewis's own diary entries and will draw readers into one of the most exciting chapters in American history.

"Thomas Jefferson's Corps of Discovery included Captains Lewis and Clark and a crew of 28 men to chart a route from St. Louis to the Pacific Ocean. All the crew but one volunteered for the mission. York, the enslaved man taken on the journey, did not choose to go. Slaves did not have choices. York's contributions to the expedition, however, were invaluable. The captains came to rely on York's judgement, determination, and peacemaking role with the American Indian nations they encountered. But as York's independence and status rose on the journey, the question remained what status he would carry once the expedition was over. This is his story."--Provided by publisher.

Provides background information and historical details about the Lewis and Clark Expedition through the adventures of Seaman, the Newfoundland dog who served the Corps of Discovery as a hunter, retriever, and guard dog.

Born the runt of his litter and gambled away to a rusty old riverman, the Newfoundland pup Seaman doesn’t imagine his life will be marked by any kind of glory--beyond chasing down rats. But when he meets Captain Meriwether Lewis, Seaman finds himself on a path that will make history. Lewis is just setting off on his landmark search for the Northwest Passage, and he takes Seaman along. Sharing the curiosity and strength of spirit of his new master, Seaman proves himself a valuable companion at every turn. Part history, part science--and adventure through and through--The Captain’s Dog is the carefully researched, thrilling tale of America’s greatest journey of discovery, as seen through the keen, compassionate eyes of a remarkable dog.

Describes how Sacagawea found adventure guiding Lewis and Clark to the Oregon coast.