sick as a dog
Very ill, especially from a stomach malady. For example, I don't know what was in that stew but I was sick as a dog all night. This simile was first recorded in 1705. Why a dog should be viewed as particularly sick remains unclear.
Words nearby sick as a dog
siciliano,
sicilies, two,
sicily,
sick,
sick and tired,
sick as a dog,
sick at heart,
sick bay,
sick building syndrome,
sick call,
sick day