Who Gets Fluffy?

For four years investment analyst Anna has been married to would-be novelist, Mark Curtis. One Christmas Day the Curtises realise they have drifted apart, and decide to end their marriage. But when Mark claims sole custody of Fluffy, their adored dog, Anna is outraged. Just as the fur begins to fly in court, a long-held secret is outed and a surprise witness is produced: whose dog is Fluffy, and how did Anna acquire him?