The owner first checks the severity of the crack: if the sole of the foot is only red and swollen, it may be caused by frostbite due to cold weather or the dog digging hard on the ground. At this time, buy disinfectant and anti-inflammatory drugs and apply them to your pet every day; if it is cracked, If the infection is severe and accompanied by bleeding pustules, the owner cannot handle it by himself and must send the pet to a pet hospital for treatment.