The best way to avoid cutting the quick is to find them before you start trimming your dog’s nails. You can do this by using a nail trimmer with a built-in light or by shining a flashlight on your dog’s nails so you can see where the quick is. Once you know where the quick is, you can avoid cutting it when trimming your dog’s nails. If you’re not sure how to find the quick-on-black dog nails, you take your dog to a groomer and have the groomer trim your dog’s nails for you. In the process, you can ask the groomer to help you find the quick so that you can trim your dog’s nails on your own next time.