A cat’s bladder is in the middle of the abdomen, close to the tailbone. Generally, when you touch a cat’s abdomen, you will find a small hard ball, which is the bladder. Owners should be careful when touching, and do not use too much force to avoid risk to the cat. A stress reaction occurs. Usually, you should guide the cat to drink more water, or feed it some vegetables and fruits with high water content to help the cat urinate.