This electric nail file can be used on cats, as well as small to large dogs. It has two speed settings, so it's best to start with the lower setting if your pet isn't used to it. It's quiet and gentle, so it's also recommended for pets that don't like having their nails clipped. I have another one of these and use it on my small and large dogs, and they don't mind it at all! This item is brand new and unused.