Original: When Dodger sings "Why Should I Worry?" in the beginning of the film, some of the dogs shown are Peg, Jock and Trusty from Lady and the Tramp and Pongo from One Hundred and One Dalmatians.
Simplified: Also, Lady and the Tramps Jock, Trusty and Peggy, as well as Pongo from One Hundred and One Dalmatians, make cameo appearances during Dodger's "Why Should I Worry?"