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<center>'''What is the most likely diagnosis?'''</center>

<center>'''What is the most likely diagnosis?'''</center>

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This seven-month-old, male German Shepherd Dog started to become acutely lame on its right forelimb 5 days ago. The dog was presented as an emergency because of acute exacerbation in this limb. On physical examination the dog had a rectal temperature of 103.6°F (39.8°C); he was reluctant to stand and was only toe touching with his right forelimb once he did stand; no obvious external trauma could be seen. Orthopedic examination revealed no obvious skeletal fractures. Deep palpation of the left proximal ulna and the shaft of the right humerus was painful. Radiographs of the right humerus were taken.

<center>Several recently imported koi are showing extensive damage to their tails.</center>

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[[Image:ECC 18.jpg|center|200px|link=Small Animal Emergency and Critical Care Medicine Q&A 18]]

[[Image:Ornamental Fish 03.jpg|center|200px|link=Ornamental Fish Q&A 03]]

<center>Test yourself [[Small Animal Emergency and Critical Care Medicine Q&A 18|here]].</center>

<center>Test yourself [[Ornamental Fish Q&A 03|here]].</center>