She can't accept that Ray has NO IDEA why. He just knows he wants out. Jane, however, has no intention of getting back in the saddle. And the Old Cow - New Cow theory is born. Jane decides that men have a lot in common with bulls, who always chose a cow they've never mated with over one they have.
All men are really looking for is a new cow.
Once a woman sleeps with a man, she becomes Old Cow. The ramifications of this theory, as seen through the eyes of a woman who's been cast aside, are played out in hilarious fashion. Jane's obsession with animal behavior could easily descend into the whiny ramblings of a woman who needs to let go and get on with her life, but the characters who surround Jane provide plenty of comic relief, and Laura Zigman's use of timing keeps the novel from getting bogged down in self-pity. It's not the kind of novel you spend hours puzzling over, but while you're reading it, it's an entertaining ride.