I won second try with hares on medium, I think the trick is to:

A) make sure you get at least one hare to one of the central two spots (will always be possible) and camp it there. Keep your other hare moving around on your side.

B) the opponent will have to bring two hounds over to catch your other hare. To do this they will have to create a gap between the first and second hound in the middle spot above/below your camped hare. As soon as this happens, move your camped hare upwards.

It's pretty easy after that TBH. The AI has usual burnt a load of moves by that point and you have so many options from that position