The accused couple's vet, Karen Phillips, gave evidence at the trial that SPCA inspectors were unprofessional when they raided the Tararua property.
Mr Balfour had called her to help assess and treat the animals, she said.
SPCA staff smoked at the property and also made "inappropriate" comments while they were euthanising 47 of the dogs, Mrs Phillips said.
She said between the end of 2006 and January 2007, the Balfours' animal breeding operation had been plagued by outbreaks of ringworm and cat flu, and symptoms of a rare disease called panleukopenia.
When asked by the prosecution whether she had noticed the "grim" conditions the animals were allegedly found to be living in during house calls, Mrs Phillips said she had not noticed anything that caused her concern.