The video shows the sedated pit bull pup being dragged on the floor before getting up and stumbling into the shelter’s kill room, while other dogs in the background loudly howl and bark... The center defended [killing] the dog — who it said was named Maverick — telling The Post he was brought to the shelter by the NYPD on April 25 at the behest of his Bronx family after allegedly biting his owner... But when Maverick was picked up by police at his former home, sources say the pooch was friendly, wagged his tail and hopped right into the back of the police cruiser where he remained calm and friendly the whole ride to the shelter.