First Lady Molly has always been the only dog in the McPherson family, and she likes it that way, but all of that is about to change. When Mr. and Mrs. McPherson decide to foster Winston (a three-legged dog from a local animal shelter) until he can find his forever home, she isn't quite sure how she feels about it. He seems nice enough, even though his wooden leg (prosthesis) is a bit strange, but she isn't thrilled with the idea of sharing her family...