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 ? '' 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 .