Sinbad, the Coast Guard’s most famous mascot. He was adopted by a crewman from the cutter Campbell prior to World War II. He was so beloved by the crew that they actually enlisted him in the Coast Guard. Sinbad had a book written about him. [Source]
Bobbie the Wonder Dog (1921–1927) was a dog from the U.S. state of Oregon who became famous for traveling 2,551 miles (4,105 km) to return to his master’s home in the city of Silverton.He is sometimes referred to as Silverton Bobbie. [Source]
King Buck, a Labrador Retriever, successfully completed an unprecedented 63 consecutive series in the National Championship Stake and was the National Retriever Field Trial Club champion for two successive years (in 1952 and 1953), which accomplishment was not duplicated for nearly 40 years.
He was also the first dog to appear on a United States Fish and Wildlife Service Duck stamp, which always featured a water fowl.[Source]