mine does as a few of you know, she does it flushing hare, somtimes, but is also silent on some runs.
she will also do it a little on bushing rabbits daytime. but is silent on bunnys on the lamp.
mines only 1'4 kelpie, but mine might not have come from the kelpie side, as the dam (whip/grey), her sister did it. so with mine its more likely to have been inherated .