Wrong Word?

Hmmm. I have been using shusssssh to speed Rave up on her outruns/flanks when needed. I have been using pussshh when I want her to move into the sheep to speed the sheep up on the drive. Both have sssh sound. So does Rave try to slip around on the push because she doesn't want to go into the bubble (probably) or because she associates that sound with going around? I am going to try just telling her to walk up. Saying it quickly and in rapid succession and see if that makes any difference.