I use the Dremel 400 XPR (corded) tool w/ the flex cable attachment. It would clearly be overkill if all I used it for was trimming my one dog's nails, but it is a great tool. If I had a grooming shop, I'd definitely go that way. It's powerful, quiet, and variable speed. You can hang the drive unit on a hook and the tool end of the cable is extremely handy. Buy the best and you only cry once.