My dog is 7 months old and she pees and messes at both my back doors to the house, it is like she is trying to get into the house to pees, she will move back and forth at the back door, finally when she sees I am not letting her in she will do her business right there, any suggestions to stop this.

Can you give a little more info...

Is your dog an outside only dog or is it allowed inside?

If she is allowed inside then she is probably just waiting at the door(s) to come inside and finally can't hold her bladder anymore and just goes by the door.

It could be mild separation anxiety.
Does she cry at the door or wait there without moving around the backyard at all?

You may need to personally take your dog outside to go potty. Something may have scared her and she doest want to be away from safety. Go out there with her.. Praise her when she potties.. Maybe play with her a little bit before heading back inside. Make going outside a good thing. Not a negative thing that the dog is dreading to have to do every time puppy has to go potty.