Hi guys. My wife had a chihuahua before we got married, but it was also close to her parents, so she decided to leave it behind at her parent's house.
Well today I decided to surprise her with a 5 year old chocolate female I found in the paper. When I picked her up (she was staying at a grooming place) she was scared but pretty friendly. She climbed all over me during the car ride home and after getting home she stayed near me and even jumped up on me when I called her, but I had to leave and go to work for a little while so I put her in our large master bathroom for a little while. Well when I came back she was suddenly different and now keeps hiding behind the toilet and won't come out. If I approach her she growls a little, but nothing too fierce, and a little while ago I tried to pick her up when I saw her sitting on a pile of clothes near the toilet and she took off toward the toilet and nipped at me, not drawing blood or hurting much, but a little warning nip.
I know that all animals are different, but what can I do to help her understand that it's ok to come out and walk around? I will be needing to take her outside so she can potty.

