The man posing as animal control said the lost dog's owner would have to make an appointment to get the dog back and pay $79 ahead of time using Cash-App or a gift card -- indications of a scam.
Officers named the 200-pound pig "HAMrietta" and say she has a "sweet personality with a sweet tooth to match."
Surveillance cameras spotted the large, flightless bird, named Mallory, wandering through intersection of a Boston suburb.
Specially trained climbers went up the mountain, coaxing the scared, cold dog into their arms.
A surveillance video shows the woman's 10-month-old pregnant Frenchie, Melani, in the arm of one suspect as two people run out the door.