There are some ground rules (pardon the pun!) BEFORE you start:
1. You never, ever apply pressure to the nail with grinding head. Allow the speed of the spinning drum and the friction of the sand to do the grinding. If you apply pressure, it will press on the quick and it will get too hot. Both mean that your dog will be uncomfortable and unhappy.
2. Never keep the Dremel in one spot longer than three seconds and never do the same nail for more than three seconds continuously. Once again, this will cause the head and the nail to get too hot. You will burn and hurt your baby. I alternate around nails and then come back to allow cooling time. I usually do two paws at a time. So, I do one nail for 3 seconds, the next, the next and the last. Switch paws and repeat on other paw. Return to first paw and repeat whole sequence.
3. Always support the toe and nail you are currently working on. There will be some vibration from the grinding and your dog will be more comfortable if you lessen the effect of this by holding the toe in question. Also, this enables you to have better control in case your dog moves the paw so you don't accidentally grind fur or pads instead. Incidentally, if you push slightly on the underside of the pad, it will extend the nail out a bit further for easier grinding: