I have a six month old Shih-Tzu, Snickers, who I love to death. He is a really good dog and very playful and lovable. Two days ago, someone my fiancee works with said that they had Pitbull puppies that they had to get rid of and if they didn't find someone to take them they would have to take them to the Shelter. Well, we couldn't stand the thought of that, so we took one. She is 12 weeks old, (we named her Kahlua) and she is very lovable with people. The problem is that she doesn't seem to like Snickers very much. We brought her home yesterday and I tried to introduce them and she growled and snapped at him. I tried to introduce them again today, but she snapped at him again. I'm scared of her really hurting him. They are both crated so they are never alone together without very close supervison, but I'm scared that she will never get used to him because she might be too old. Anybody have any suggestions or ideas on how to socialize them?? I'm not sure what to do.