I have always used a dremmel, then a finishing file to smooth. But on dogs with really dark nail, it is nearly impossible to see so I do a very small amount and check,drill, check .
@wizard:
So did the hoodie help keep mosquitoes from pestering him?
Nah. It's too hot up here right now so he only wears it indoors. Perhaps I should look for a tank top to keep them away though :p