I currently have a female chihuahua who is a little over 2yrs old. She is a tiny cuddle bug and has always been the baby of the house. Since we would like her to have pups someday, we decided to get a male companion for her, even though he is younger than her (10weeks-but he's pretty stocky). Anyway, we just got him and of course her normal response is aggression! She is not really happy with him, even though he doesn't mind her. We've tried introducing them in a neutral place, with crates and everything...We can't be there all day and he still needs his 2nd shots so he cannot be outside...at home we have to keep them separate because she goes nuts! She barks at times and cries at others, seeming like she wants to play, but as he gets closer she gets mad. I'm not quite sure how to handle this, nor how long this is going to take because it is exhausting. Can anyone help me with this? Any ideas?Facts?Tips?