I htink much depends on the individual dog. Ive often taken dogs up easy scrambly bits (mongrels with collie tendancies) - and they've usually been OK with occasional help - eg on the step on Striding Edge. If your dog is small enough to be lifted, and wont object to being manhandled (you wouldnt want fido to take a chunk out of your face as you're lifting him up a rockstep) - and will sit and stay when told to let you get into a position to help the dog - then its reasonably safe. CMD would be within the capabilities of many dogs, I would have thought. We took two dogs over Crib Goch and they coped without any problems at all. Be warned, though that I once had to carry a 19kg dog for 4 miles - and, later, cough up £70 in vets fees after the dog blobbed off a fairly easy scrambly bit - so there are risks. I tend to keep the pooch on a long line nowadays to prevent any similar accidents.