 split toenail like right up the middle and um is there a way to prevent is there a prevention for that well the best prevention is keeping your dog's nails really well trimmed because i rarely see well-trimmed nails getting split it's when they grow out then you have enough nail to get caught on something and get it twisted um yeah split nails are kind of a little bit of a nightmare because they're very painful to the dog and my comment about split nails is the worse they are the better they are