Michelle put super sniffer Lilly through her paces watched by a large group of people including a number of cruise ship passengers.
The adorable beagle was easily able to pinpoint a banana hidden in a box, then a kiwifruit in a backpack among a bunch of boxes and luggage laid out on the ground.
Lilly had been donated to the Ministry by an Auckland family and proven highly successful as a biosecurity detector dog, Michelle said.
"Lilly's phenomenal and it's a privilege to work with her. She does absolutely great work because of her highly sensitive nose and her ability to detect lots of different odours."
Michelle said that included Lilly having detected lizards and snakes hidden inside a package at the Auckland International Mail Centre 18 months ago. The offender was subsequently identified and convicted.
MPI senior trainer Alan Willox said in conjunction with the new mobile biosecurity x-ray machines, detector dogs like Lilly were a vital tool because she could pinpoint exactly where any contraband was hidden within mail or a piece of luggage.
"Lilly is pretty tenacious and she's excellent at her job,"Mr Willox said.
Mr Willox said MPI used mostly hunter dogs and beagles made great biosecurity dogs because they would work "all day every day" and were very focused on the task.
MPI also has a beagle breeding programme that had proven 100 per cent successful.
Celebrity Solstice passenger Pam Finlayson from the UK said she "got sniffed" during a biosecurity search of all the passengers luggage.
"It's great to see these lovely dogs helping protect New Zealand from unwanted pests.
Clearly they have a phenomenal sense of smell and it makes sense to use them."
Port of Tauranga commercial manager Leonard Sampson said Biosecurity Week provided a good opportunity to strengthen the awareness of biosecurity risks within the community.
More facts about MPI biosecurity detector dogs
MPI bought the first beagles in 1995
60 biosecurity detector dog teams operate at NZ's border
Cost $20-$40,000 to train
Training takes about 16 weeks
Can sniff out meat, vegetables, fruit, seeds, and plant materials