Ingrown nails are uncommon on most pets if they are active enough. If your pet plays around enough and is groomed regularly it is less likely that it will encounter an ingrown nail. If the nail is not trimmed it can split and become injured. Any overgrown fur can hide an ingrown nail and then it will become a problem. Simple first aid can take care of an ingrown nail however they are very painful and may require veterinarian assistance to treat.