A 10-year old German Shepherd presents to you with the complaint of licking the anal area. On examination, you find numerous ulcerated tracts in the perianal area that are draining purulent fluid. What is the diagnosis?
一只10岁的德国牧羊犬由于不停舔舐肛门周围前来就诊。检查中你发现其肛门周围有很多溃疡性瘘管并且有脓性分泌物流出。你的诊断是什么？
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