The bladder of dogs changes greatly. When the bladder is full of urine, it moves to the abdominal cavity and even to the navel; when it is empty, it often completely retreats into the pelvic cavity. Therefore, it is manifested as variability in volume and position on veterinary B-ultrasound images. With the dog in a supine position, the veterinary B-ultrasound linear probe is scanned horizontally and vertically at the front edge of the pubic bone to measure the diameter and volume in the normal filling state before urination, because the bladder is in this anatomical position when it is full of urine.

The diameter and volume of the bladder measured by veterinary B-ultrasound are not significantly different from those measured by anatomical measurements, indicating that ultrasound can be fully used for the diagnosis of bladder diseases. The range of variation of the bladder diameter and volume measured by ultrasound. When the diameter and volume of the bladder of the Pekingese dog examined by veterinary B-ultrasound exceed the above range, we can suspect urethral obstruction (urethral stones), prostatitis, bladder muscle sluggishness, nerve paralysis, etc. If the obstruction is caused by urethral stones, the urethral stones can be found by veterinary B-ultrasound examination; if it is prostatitis, the enlarged prostate can be touched through rectal exploration; if it is neither of the above, then veterinary B-ultrasound is used to guide puncture and extract urine. When there is blood in the urine, it is bladder muscle sluggishness caused by inflammation, otherwise it is caused by nerve paralysis. When the dog does not urinate and the volume and diameter of the bladder examined by ultrasound are less than the above range, veterinary B-ultrasound can be used to examine the kidneys and heart, and it is easy to find the cause of the disease. Generally, when the bladder wall is inflamed, the bladder wall thickens and becomes rough on the veterinary B-ultrasound echo map. It remains to be further demonstrated that when bladder stones occur, the diameter and volume of the bladder increase, and stones with strong echoes appear in the liquid dark area, which can change their position when pressed with a Veterinary Ultrasound probe. However, bladder muscle tumors do not change their position when pressed. This further illustrates the accuracy of veterinary ultrasound in diagnosing bladder stones.

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