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* Vommiting  
 
* Vommiting  
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On abdominal palpation the colon is distented with firm faecal material. Digital rectal examination will reveal hardened faecal balls.  
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On abdominal palpation the colon is filled with firm faecal material.  
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Digital rectal examination will reveal hardened faecal balls, there may be a palpable mass or sticture, anal sac disease or perineal hernia depending on the cause.
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===Ultrasound===
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Abdominal ultrasound shows a colon imapcted with faecal material. It may also reveal the cause in some cases such as foreign body, colonic mass or stricture.  
 
==Treatment==
 
==Treatment==
  
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