Sarah Francis (Edmondson) is a young teacher who hasn’t quite got her life together; the last thing she needs is someone else to look after. However, when her grandmother bequeaths Sarah her prized possession, a spoilt pug named Patrick, she is forced to step up to the plate. With the help of a kindly vet (Skrein) and a fellow dog walker (Bennett), Sarah finds her feet and discovers that Patrick might very well change her life for the better.