I missed this one so I thought I would post to it.
The dremel or rotary tool was originally used for doing birds(parrots) nails because their quick is very long and close to the tip. It ends up being safer to use the dremel on their nails. It grinds like a sander so no big chunks come off. No worries of getting hit in the eye from a piece flying.
The dremel makes for a nicer job, rounded nail, shorter.
Also, groomers use many power tools.