Dog pulling/struggling/not peeing now on walks?

My idiotic 6-year-old sibling threw a tantrum to walk the "family" dog (I take care of it, no one gives a frick, obviously) my mother complied just to tick me off and all throughout the walk, my sib was yanking and pulling on the leash like crazy, and now when I try to walk the dog, she puts her head down and either stands stock-still or starts pulling real hard, and when she's not pulling she bolts ahead and of course the leash snaps taut and she starts pulling again. What do I do? I have to take the dog out every two hours and I can't stay out there for hours fighting with her. Yes my siblings are animal abusers and it tortures me that my parents don't care.
 
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