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Has there been any straining to urinate or abnormal colored urine?
It is not uncommon for there to be a very small amount of discharge from the penis, or more commonly, seen at the prepuce (sheath)If there is significant discharge, or it is more yellow or green (than clear), has a mal-odor, or your dog seems excessively irritated, it may be caused by a urinary tract infection or even an infection or inflammation of the glans of the penis - commonly called a balanoposthitis.
Aside from a normal UTI - a balanoposthitis is an inflammatory condition of the glans penis and prepuce - commonly caused by a bacterial infection.When there are signs such as above, we recommend making an appointment with your veterinarian for evaluation.At times a urine sample is taken and the discharge can be evaluated under the microscope to look for bacteria.If that is the case, then a course of antibiotics will be prescribed.I hope this helps!