Each dog poop bag has to be cut open by hand, the contents liquefied and put straight into the city's sewage treatment plant.

The borough mayor is asking dog owners to be respectful.

The pooprint. It's the latest way some landlords are getting dog owners to scoop the poop. “They do a doggie DNA for all the dogs in the building, and then if someone's not cleaning up after the dogs, they can find out who it is,” dog owner Kevin Mullan said.