There is a contract between man and dog. I am not sure of the precise words. But apart from a few dogs that go Cujo, they all live up to it. With man, it's more hit and miss.
Once it's over, it's over. You can't say, as men have a tendency to say: "Tomorrow". There is no tomorrow.
There is only today and now. Dogs know this. Bibi, above, certainly does.