The reason for my confusion if you're able to place a shepherd on a hill is because of the following in the Dutch rules:
On page 2 it says "A shepherd is not a follower/meeple."
On page 3, in the Hills section it says: "After drawing a hills-tile, immediately draw another tile face down and place it under the hill-tile. Place it according the usual rules. You may now place a follower on that tile."
Because they first make clear the shepherd is not a regular follower and then the next page with the hills tiles they only say you may place a follower.
This led our group to interpret this as it's not allowed to place a shepherd on a hills tile.
To me, it doesn't make sense and you should be allowed to place it on a hill, but an official ruling would be very welcome. Or, how is it described in the official German or English rules?