In reply to girlymonkey:
Hi gm.
There are dogs who could manage Liathach fine, but I think they're very much the exception.
I'd say the scrambling difficulty, degree of exposure, and consequence of a slip are pretty similar to those on the Aonach Eagach, really, so you could judge from that, but I'd err on the side of not taking the mutt on this one.
On a side note, I don't know whether you know Adrian and Jo (used to live in Drymen, but now crofting in Inveralligin)? One time I met them by coincidence on a scrambly, stepped section on the Beinn Eighe ridge, while they were having a bit of bother getting their dog Buffy across it. I helped (largely lifting Buffy ledge to ledge, climbing to her, picking her up again and repeating, until we were clear); from that day on I was officially in Buffy's pack, and always got a great welcome from her, despite her general dislike of men. She was a great hill dog, and had an amazing life with them. But, aye, unless your hound is a keen scrambler, I'd probably not take it on the Torridon ridges.