Fifteen-year-old Leah lives on a housing estate that backs onto the dog end of the Thames some 20 miles east of London. She lives in a run down flat with her mum Val who unable to cope much with life takes out her frustrations on her daughter both physically and emotionally. Deprived of love and attention at home Leah goes looking for it elsewhere. She lurches around the estate with abusive lads like her boyfriend John who at only nineteen is already angry at the world. Dog takes place on what starts out as ordinary day for Leah but turns out to have a shocking and violent conclusion when John is pushed over the edge by an innocuous incident.