If you can stay awake, you'll see a performance by Keaton that is radiant in its simplicity, all ditheriness shaken off. She's still peaking - someone give her a great role.
The movie is not about the dog. It's about the people who find love, settle their differences, and get their priorities straight while searching for him. Still, when all is said and done, the dog is the only thing you care about in Darling Companion.