Flying with pets

I could use some help on how to go about flying with my small dog/yorkie. I have never done this before and I'm hoping it's not too expensive..
Has anyone done this?

I will be bringing her as carry on in the cabin.
I know each airline has different requirements.

Good tips. Thanks! I know Delta don't need a health certificate.
    Comment deleted
    Yeah. They allow up to 4 pets in cabin on every flight. Every airline is different though.
    About Val Paille
    Current: Laguna Niguel, California
    Birth: July 19
    On since: Nov 3, 2013
    Boston/Cali. Army Family. Christian, Mom to a beautiful daughter who is 18. Married to my best friend. Known him since I was 14. EDD: 7/11/16 ♡