"The veterinarian concluded that the dog would have endured significant pain and suffering over an extended period ... any lay person would have realised the dog was in need of veterinary treatment,'' Ms Border said.
Dog owner Joshua Skinner was charged with failing to ensure the dog received treatment to alleviate its pain, but he failed to show up in court several times.
Judge David Ruth in the Te Awamutu District Court condemned Skinner for his failure to help an animal that had obviously suffered great pain over a long period.
He sentenced Skinner to 300 hours of community work and ordered him to pay the SPCA $951.
Ms Border said although it was good the SPCA had obtained a conviction, nothing could make up for the unnecessary suffering the dog endured.
"We can't be everywhere at once _ we need members of the public to keep their eyes and ears open and call us if they see or hear an animal in distress, particularly over
the holiday period.''