We use the cordless pet dremel - it is very quiet, and have no problems. We used clippers before for dogs, but it was a battle and scary because the last thing you want to do is hit the quick. I get a flashlight (pocket sized) and shine it behind the nail. I then mark with a sharpie - choose whatever color you want

and mark where the quick is. Then, I just sand until I get to that point. We try to do this once a week as the quick will pull back if you don't let the nails get too long and keep them short so you can go even shorter. If you can hear their nails when they walk, they are too long. Dremeling is kind of fun especially when you consider there are so many different attachments to do the projects around your house and then your dogs nails!