The series stars the voices of Julie Bennett as Monica, Jackie Joseph as Sandy, Frank Nelson as Uncle Dudley and Frank Welker as Dinky the dog. It tells about two sisters that buy a tiny puppy at the pet store, the dog soon growing to enormous size and continually and unintentionally causing chaos and destruction in and around the house, to the ire of Monica and Sandy's Uncle Dudley. Episodes also saw the four main characters go sailing around the world, giving Dinky the chance to wreak havoc internationally.