I wanted to wait a bit before I posted my review. I have 3 dogs, and I wanted to try it on all of them at least once. I have 2 small yorkie dogs and then a large pit bull. The two smaller dogs were pretty easy to manage, their nails fit in the slot pretty good, and they were not really freaked out by the noise of the grinder. It scared them at first, but they were good after that. My big pit was a bit different. He's never had his nails worked on before, I should say first of all. At first he got very freaked out, but that was mainly by the grinding feel, not anything to do with the device. His nails are huge, so didn't fit in there so much at first, but after a few minutes, they were fine. The noise was a bit loud for him, but other than that, the grinder did what it was supposed to do. Since it was his first time, I didn't want to spend a long amount of time on him, thought I would ease him into it. But the grinder seems to work well, and I hope it stands up to the test of time.