Sinbad (born ca. 1937, died 30 December 1951) was a mixed-breed dog, facetiously described as "a canine sailor" with rank "Chief Dog (K9C)" and status "USCG, Retired", who "served 11 years sea duty in the United States Coast Guard, including combat in World War II aboard the ". Brought aboard by a sailor who had intended him as a gift to a girlfriend, he was nevertheless said to have "never had an owner or master". A biography was written for him, and contrasted with an assertion that "no Coast Guardsman [was] the subject of a biography until the dawn of the twenty-first century."