The gentle dog with a massive tumor who was rescued after being abandoned on a cold December night in Malden, Massachusetts, has had her medical bill paid off. It cost about $5,000 to both spay and remove the 13-lb. tumor from the mastiff, who’s been given the name Big Momma since a good Samaritan found her whimpering while tied to a pole in a Trafton Park playground, according to the Animal Rescue League of Boston.