Greg and Kate's children are grown. He's at loose ends, dissatisfied with his job. She's taken up a career in midlife and is prospering on her own. Then one day, while playing hooky from the office, Greg finds a stray dog in the park and brings her home. Sylvia proves an escape for Greg, but becomes a rival for affection to Kate, as well as a threat to a more simplified way of life. The marriage is put in serious jeopardy, as the three go toe to toe and paw to paw in an attempt to resolve the situation.