Changeover, a son of In The Pocket now retains the Len Smith Mile, which he won at Menangle NSW on April 26.
The horse returned a positive swab to the anti-bleeding drug tranexamic acid.
Details of the appeal have not yet been released, but Small's lawyers apparently argued successfully over a point of law on the drug's classification.
It is understood that harness officials in New South Wales will not appeal the ruling.
Small is currently appealing a six month ban in New Zealand and faces a possible charge in Victoria after his pacer Zenad returned a positive test to a different drug earlier this year.
Small was unavailable for comment at Alexandra Park last night but celebrated the decision with Changeover's victory in the $25,000 Majestic Horse Floats Free-For-All.
It was the 6-year-old's 27th win and first since April 26 in Australia.


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