Every animal I've owned in the past has had clear nails, so I could always see the quick and know how far to cut. Now, one of our 5 dogs has black nails. We use a PediPaw (different brand, same concept) to cut all the dogs' nails, but I've been noticing that Princey (the one with black nails) doesn't get them cut far enough back. I know this is because whoever does his nails (usually my husband or his mother) is afraid of hurting him, but I also know that if they keep going like this, his nails are going to get way too long. They're already starting to look too long, and I want to put a stop to the problem before it gets out of hand. I've heard that there's some sort of sign that you're getting close to the quick when you dremel the nails, a white dot or something? Could someone please explain this better, and give me any other tips that you think would help? Thanks in advance.