A woman who was forced to give up all her animals and banned from owning any more for 10 years is challenging the penalties.
Anne Power was found guilty of recklessly ill-treating a horse and causing its death, after a two-day trial at North Shore District Court in March.
At sentencing three months later, Judge Nevin Dawson accepted the SPCA's suggestion for Power to forfeit her many animals and he imposed the decade-long ban.
In the High Court at Auckland this afternoon her lawyer Dan Gardiner argued against both her conviction and sentence, calling it a "miscarriage of justice".
He questioned the recklessness of the alleged act and whether the alleged recklessness actually led to the death of the 32-year-old horse.