Empire Interactive published
Sheep for the PlayStation and PC (at least), and in the Blitz world I remember (long ago) Blu_Matt (come back Blu!) was writing Sheeper Keeper firstly as part of a No External Files competition and then subsequently (I think) with a view to it being published by (then) Guildhall. AFAIK though, it was never finished, and Blu vanished not-too-long thereafter.
As a bit of trivia, Beaker held two No External Files competitions way-back-when. I won one of them (yay for me!), and the other was won by HunterSD who went on to become Michael Reitzenstein who went on to do... nothing much... </blatant lie> :o)
Apart from all that though, I can't think of a sheep-herding game recently.