A tissue sample of a laryngopharyngeal mass from a 9-year-old male Dachshund dog was submitted to the Animal, Plant and Fisheries Quarantine and Inspection Agency for histopathologic evaluation. The mass measured was 3.1×3.0× 5.0 ㎝ in diameter and was first detected by computed tomography. Histopathologically, the nodules consisted of large round and polygonal cells with abundant eosinophilic cytoplasm. The mitotic index was 1～3 per view under a high power field (400×). Immunohistochemically, tumor cells were positive for vimentin and desmin, but negative for cytokeratin, S-100, and α-Smooth Muscle Actin (α-SMA). Based on these findings, the tumor was confirmed as Laryngopharyngeal Rhabdomyosarcoma. To the best of our knowledge, this is the first case report in Korea.

• Kyung-Hyun Lee(Animal, Plant and Fisheries Quarantine and Inspection Agency) Correspondence
• Soon-Seek Yoon(Animal, Plant and Fisheries Quarantine and Inspection Agency)
• Woo-Hee Park(Animal, Plant and Fisheries Quarantine and Inspection Agency)
• Moon-Young Rhyoo(Animal, Plant and Fisheries Quarantine and Inspection Agency)
• Young-Hwa Jean(Animal, Plant and Fisheries Quarantine and Inspection Agency)
• Ji-Youl Jung(Animal, Plant and Fisheries Quarantine and Inspection Agency)
• You-Chan Bae(Animal, Plant and Fisheries Quarantine and Inspection Agency)
• Sung-Min Park(Joongang Animal Medical Center)
• Myung-Hyun Lee(Animal, Plant and Fisheries Quarantine and Inspection Agency)