A survey of myiasis among cases brought to the surgery clinic of The Veterinary Teaching Hospital at King Faisal University was made during the period January - December 2005 . It reveled that, sheep were the most species susceptible to myiasis (174 cases), this was followed by goats (169 cases), then cattle (64 cases) and the least incidence was among camels (53cases).Diagnosis of these cases showed that the flies were Lucilia sericata , Wohlfarhrtia nuba , Sarcophaga cruentata , Chrysomya bezziana ,Oestrus ovis and Cephalopina titilator . Most of the myiasis cases in animals were reported in the most rainy months in Al-Hass during the study period .This started from September (80 cases ) until  April (32 cases).