Maya IK chain


Hello, i have imported by bridge model of dog from 3ds to maya, as i read, with this way model looses ik chains, so i try it make inside the maya, i makes like on tutorial, same settings like u can see on preview, but if i select start and end of the ik chains, the leg always gonna straight, and cannot bend it, i makes something wrong, and im new in maya, can u advice whats wrong in this chase ? bones are reseted and settings same as the preview, but legs goes always to straight possition, thank u