Hmm.. when I first got my dogs, they chased my cats but I think that was just because they had never seen cats before and they soon got out of it (they realised mom was NOT impressed!!). I think your problem is going to be a bit harder to solve.

I might be facing a similar problem soon. I'm moving onto a 2 1/2 acre property fenced with electric fencing. Our neighbours have 5 German Shepherds that are partial to cats! Hopefully my cats have the sense not to go next door!