If the dog has light colored nails it is easy to avoid the quick. It's the pink shadow you see at the base of the nail. It's not too tough with dark nails either if you just look at the tip (you should be able to see how far in the quick is) and make a few small trims to be careful. When I trimmed my brother's Chihuahua mix pup I used a small pair of scissor style (as opposed to guillotine style) clippers...probably essentially the same as cat clippers. It was actually much easier and faster than clipping my own dog's thick black nails, since they're so soft and thin.