Sniper Wolf is Fox-hounds best shooter, by taking Tranquilizers she is able to sit and wait for nearly days, weeks and months, aiming on one target. As Ocelot said, she even at times fals in love with her victums before she kills them. Hal Emmerich is in love with her, after she saves the dogs he tried to protect. She is nice to him, allowing him to always feed them, thus his eventual crush on her. She is responsible for shooting Meryl, but later your able to kill her before you manage to get to Volkan Raven.