The 50 Labrador retrievers and golden shepherds that make up the MTA’s K-9 unit are moving upstate — to a multimillion-dollar, 71-acre training facility.

The agency is prepared to pay $1 million for a swath of green in Stormville. The total cost of the facility — where old Metro-North trains will be used as practice — will be about $7 million, said the MTA, which formed the unit after 9/11.

Last year, the dogs were called on to check about 1,200 packages left unattended on the New York City transit system, yet this will be their first full-time home. Currently, their officers are their caretakers.