Pork is illegal in Qatar, and observant Muslims will not drink alcohol. The meat they eat must be Halal: the name of God must be uttered at the moment the animal is killed (normally by slitting its throat) and as much blood as possible should be drained out of the animals' body before it dies.
In Qatar, despite the hot weather, people do not wear revealing clothes (singlets and shorts) as it is a quranic requirement that Muslims, both male and female, dress and behave modestly, for non-Muslims, wearing revealing clothes will be offensive to the Qatari culture.