I hate my sister's emotional support dog
Her dog seems very friendly, why do you hate the dog?
He jumps on me because she can't control him and he doesn't smell very good. The smell is really off putting.
Maybe you should tell your sister she should take the dog to a groomer for a bath. You could also suggest that she get some obedience lessons for the dog. Tell her that the dog's odor and behavior are becoming a problem.
I'm not sure she'll listen to anything I say. She's very stubborn and thinks she's always right.
That sounds like a difficult situation to resolve, but it sounds like someone needs to help her understand the issues with her dog. You may need to talk to her several times about the dog and maybe get another family member to speak to her as well. If there are multiple people pointing out the issues she may be willing to listen.