The dog's nails can be cut below the blood line, but not near or above the blood line. If the nail is cut to the blood line, the dog will feel pain and bleed. And your dog’s nails need to be trimmed regularly because nails that are too long are more likely to break. You can use pet-specific nail clippers to trim it. If your dog is sensitive to nail clippers, you can choose to trim it with an electric nail clipper.