Since its composition, "Hound Dog" has been recorded more than 250 times, and is one of the best-known Rock & Roll songs. The best-known version of "Hound Dog" is the July 1956 recording by Elvis Presley that is ranked no. 19 on Rolling Stone magazine's list of The 500 Greatest Songs of All Time. Presley's version, which sold an estimated 10 million copies globally, was his best-selling song, and "an emblem of the rock 'n' roll revolution". It was simultaneously no. 1 on the US pop, country, and R&B charts in 1956, and topped the pop chart for 11 weeks—a record that stood for 36 years.

Elvis Presley's original 1956 RCA recording was inducted into the Grammy Hall of Fame in 1988, and is listed as one of the Rock and Roll Hall of Fame's "500 Songs That Shaped Rock and Roll".

In 1956, Elvis went on The Steve Allen Show and sang Hound Dog to a Basset Hound. He was not allowed to dance on the show, since Allen ran a family-friendly program and Elvis' pelvis was not considered family-friendly.
~Source Wikipedia