The daughter of loving-but-work-consumed parents, Gretchen has a lonely life at the family's country house. She has a huge imagination, so nobody believes her when she says she found a wolf in a nearby cave. That she proves everybody wrong will be evident to dog-tale fanciers of all breeds, from Lassie Come Home to Marley and Me. Adorably natural 8-year-old Sharyn Moffett makes a terrific film debut in My Pal, Wolf, which deals sweetly