Actually a dremel tool is commonly used by professionals. I use one on my large parrots and they prefer it to the clipper - they just let me trim their nails one by one without a fuss. If your dog is well trained to the dremel there is little risk of hurting them because they don't argue against it. I like it because you can avoid hitting the quick and it rounds the points so you don't have you be concerned about sharp edges.
Love Them & Lead Them,
~Elizabeth & Doug
Dog Training the Way Nature Intended