Hop, Look and Listen is a 1948 Looney Tunes cartoon directed by Robert McKimson that features Sylvester and Hippety Hopper, as his first appearance. At the start of the short, Hippety Hopper escapes from a zoo. When Sylvester sees him, he believes that that the kangaroo is actually a king-size mouse. A bulldog tries to convince the cat that there is no such thing, but when he too sees Hippety Hopper and his mother (Who was searching for him), he and Sylvester hitch a ride on the Water Wagon.
The song playing on the opening titles is "You Never Know Where You're Goin' Till You Get There", which had been sung by Sylvester a few weeks earlier in Back Alley Oproar.
The cartoon was reissued in the 1954-55 season (evident from the style opening rings used: red rings with a blue background). Unlike most other reissued Looney Tunes, the original closing sequence was kept. In 1995, Turner Entertainment restored the original opening for the cartoon's "dubbed version". The cartoon has yet to be fully restored (with non-faded colors) for a DVD release.