The reason for this, is that a dog with no legs cannot walk. Therefore, he cannot come to your location because he is disabled. Unless this certain dog can roll.
After Lennon's death the idea of reunion practically vanished.
Still, Paul McCartney, Star and Harrison got together during their work on "Free as a Bird" (which included the vocals of the late Lennon) for "Anthology 1", released in 1995, and for "Real Love" for "Anthology" 2 ”from 1996.
