I use a small Dremel on my dogs claws. Works great and no pain. They get used to it quick.

My girlfriend's Westie is way too neurotic to even be in the same room as clippers or Dremel. We tried giving her a couple of Gravol once. No dice. She woke up as soon as we reached for the clippers and shit on the floor. Like I said, she's never even ever been clipped so there's no good reason for her to fear it.