Among the several inadequately realized elements in Lawrence and Meg Kasdan’s amiably shambling comedy, Darling Companion, is the performance of one of the cast, a performer with whose work I wasn’t previously familiar. Kasey, who uses only one name professionally, in the distinguished tradition of such luminaries as Arletty, Capucine, Fabian, and Madonna, plays Freeway, a pivotal character whose disappearance early in the picture precipitates what little narrative development Darling Companion contains. In his limited screen time, Kasey gives the most earnest and effective performances in the movie. Of course, as a seven-year-old mixed-breed collie shepherd, it might be said that he’s been typecast, but I prefer to regard his selection by the filmmakers as fortuitously apt. Kasey delivers.