Sorry to revive a five-year-old thread but here is a further observation about dog walking on Skye gabbro
Further to the comments above, a freind and I recently walked with a large collie-cross bitch from Glen Brittle campsite to Coire Lagan then on up the Great Stone Chute to the summit of Sgurr Alasdair.
The dog coped fine with both the small scree on the lower half of the Chute and the larger rocks and choss in the gully above.
As others have said, where the gabbro is slabby it has a very coarse grippy texture but this did not cause the dog any discomfort either.
The dog was fine on the final scramble. However, my friend and I were less confident about how safe the dog would be on the exposed bit right at the top so we took it in turns to do the last few yards, one of us keeping the dog on the lead as the other explored the summit.
The dog had no problem on the way down (same route) and the next day her paws showed no ill effects.
So IME that particular route is fine for a strong healthy dog that is used to rough or rocky walks.