A dog's split nail can be treated by trimming it past the split. Most dogs eventually end up with a split nail at some point, but the nail must be examined to determine the appropriate course of action.
The dog's injured toe is held up to the light to see how far down the nail can be cut. If the split is too far, the dog needs to see a veterinarian. The vet typically removes the injured nail. However, if the nail can be cut at home, it must be done carefully. Any bleeding resulting from cutting the nail must be stopped, and a dog-friendly disinfectant must be used to prevent infection. The injured toe is bandaged to prevent further injury, and the bandage is changed frequently.