How can my dog calm me?

Today I felt a Little down because I hated where I was living and people hate me here. My 4 year old **** Tzu, Charlie, came and sat at my feet, whinning, until I picked him up. I felt calm and didn't care where I was anymore, that Charlie calmed me with nothing but me lifting him up and holding him. I love Charlie like he is my son, but he use to not beable to do this until I left for 8 mounths then came back. I this normal for Charlie to calm me and will it happen forever, or just till the happy-giddyness of me being back wears off? Help!