If there is an actual puddle, then this may be foul smelling urine. A veterinarian should be able to distinguish which. If the problem is urine, then a urinalysis and possibly urine culture and/or blood work are indicated.
Hope that helps. 
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Christopher A. Lee, D.V.M., C.V.L.S.
Promoting surgical options and pet comfort through the use of lasers.
www.acerlux.com
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