He failed to appear at court on 21 July and was found guilty of both offences in his absence.
He was fined £1,500.
The court heard that Mr Arnold shod at least two horses on 27 December 2008 at a property in Drax, Selby, North Yorkshire.
And on 7 January an investigator employed by the Farriers Registration Council (FRC) saw him shoeing horses at a property in Belton, Doncaster.
This article was first published in Horse & Hound (20 August, ’09)