Blow on your pie cop gets a new dog.

A cop whose 3am food safety advice was heard around the world still gets recognised while he and his police dog are on the job.

"Always blow on the pie" policeman, Sergeant Guy Baldwin's new pup Capo was among the graduates from the police dog and handler training course in Wellington on Thursday.

Baldwin's advice to a man suspected of being a car thief captured by reality cop show Police Ten 7 in 2009 became a world viral hit on YouTube.

MAARTEN HOLL/FAIRFAX NZ Sergeant Guy Baldwin, of Auckland, with Capo, is now celebrating 20 years as a dog handler, but still receives shtick about the most headline-grabbing moment of his career: his infamous Police Ten 7 "always blow on the pie" quip.

When interrogated about what he was doing driving around in the small hours of the morning, the teen replied he was out to get a $3 pie.

Baldwin replied: "At three o'clock in the morning that pie has been in the warming drawer for probably about 12 hours, it'll be thermo-nuclear. You must always blow on the pie. Safer communities together, OK."

The footage of Baldwin's deadpan whipped around the world and even inspired a South Park spoof.

His new dog, Capo, was his sixth, and the first female dog he had worked with in his 20 years as a dog handler.

He said 20 years was a long time to be running around in the night-time leaping through people's backyards with a dog to catch suspects – "the fences don't get any lower."

Asked if criminals ever gave him flak about his moment in the spotlight, he said he still got the occasional reminder.

"From time to time it does happen, unfortunately. I think it's pretty old hat, now."

Capo graduated on Thursday, alongside two more new dogs, Luke and Mist.

Constable Jason Page from Whanganui got Luke after his last dog, Faris, died from cancer.

Mist's dog handler Constable Elyse Lewisis starting the role the first time to become one of just two women dog-handlers in New Zealand when she joins the dog section base in Dunedin.

She follows in the footsteps of Senior Constable Sue Burridge, and her dog Hades, who work in the Wellington police dog section.