"Get him!" Emily Jane Frater told her pitbull repeatedly as a police officer arrested her.
The dog did nothing, however, and Frater was left bemoaning the fact to officers, saying she wished her dog had bitten them.
She also said she wanted to put a bomb in the police station and Work and Income office.
Police had shown up at her house on May 15 to arrest her - but Frater had slammed the door in one officer's face, police prosecutor Sergeant Drew Morrison said. They had gone to the back door, which was locked, and told Frater she was under arrest and needed to let them in.
Frater had let them inside, and tried to set her dog on them, to no avail.
She appeared in the Whanganui District Court on Tuesday, pleading guilty to assaulting a police officer and breaching community work.
Judge David Cameron remanded her until August 17 for sentencing.
He also ordered a presentence report with home and community detention appendices.