See if you can press it to push the swelling back into the abdominal cavity. If this is the case, it needs to be treated by binding or surgery. If it is really a hernia, you can observe it for a while. If it turns black, you should go to a professional pet hospital.

Hernia is an organ in the abdominal cavity, which passes through the weak point of the abdominal wall and protrudes to the abdominal wall, forming a mass in the abdominal wall.