The third option is the scissors style clippers. These clippers are made for puppies, very small dog breeds, and cats. They act just like the pliers-style clippers they are just a smaller version. Safari makes these as well and the larger ones.
The fourth option is the grooming file. This is typically used to file down the tips of dogs nails if they’re sharp and uncomfortable. This is a manual version. I’ve personally used this, and I think it worked very well for my dogs with smaller nails, but my dogs with thicker nails needed to be filed with a dremel.
Lastly there is the dremel. This is an electric version of the grooming file. They are usually bought for household projects, but the cordless ones work very well on dog nails. My personal favorite is the 2-speed Dremel 7300. It’s pretty simple for longer nails use the high speed and for shorter touch-ups use the low speed. This option allows for you to get closer to the kwik without cutting into it. I use this in my own home, and at my work with client dogs and it works very well. When you buy it, it arrives with everything in the picture above along with a wall charger for the battery.