The Grey Hounded Hare (1949)

The Grey Hounded Hare is a 1948-produced, 1949-released Looney Tunes (reissued as a Blue Ribbon Merrie Melodie) short film made by Warner Bros. Pictures and starring the voice talent of Mel Blanc. It was directed by Robert McKimson, and animated by John Carey, Phil DeLara, Manny Gould and Charles McKimson, with music scored by Carl Stalling. The title refers to the greyhounds of the plot as well as "hounded" meaning pestered or pursued relentlessly.

More at Wikipedia.