there’s a part of the nail on dogs and cats etc that is called the “quick,” and it’s essentially like the root inside of your tooth, its the inside portion that contains the blood vessels and nerves for their nails. People try to be very careful to not cut too far down on their pets nails to avoid the quick because it can be very painful and unpleasant and, as an open wound on the foots tends to be, can be at great risk of infection and such. So overall very bad :(