如果查不出原因，就有可能是荷爾蒙導致的
Hormone-responsive incontinence occurs in neutered dogs of both sexes and occasionally in spayed female cats but occurs most commonly in female dogs. The pet can urinate normally, but they leak urine while resting. Physical examination and blood and urine tests are usually normal in these pets. Hormone-responsive incontinence can occur months to years after a pet is neutered. As pets age they may become incontinent. This may be due to a weakening of the muscles that hold urine in the bladder. There are many diseases that can cause a pet to create more urine than normal (polyuria) and several of these occur in older pets. If a pet has one of these diseases and often has a full bladder, the full bladder can push against the weakened sphincter and cause incontinence. Older pets can also develop senility and simply be unaware that they are dribbling urine.
robinsonvet.com/documents/UrinaryIncontenanceHormoneResponsive.pdf
