Threads a few mos back, the consensus was waste of $ for GSD size nails. A dremel tool for the same $ is better, you can get one at wal-mart. For smaller breeds they work, but larger nails will slow down the spin. Getting your dog desensitized to the dremel is where the challenge is! I bought a pedi-paws and then googled reviews, returned it. I got it cheap from Kohls, like 75% off. I should have donated it to a rescue instead of returning it in hindsight.