Why won't my dog come for a walk?

You must have patience! Do not tug her, it's not good. If she has a choke collar or anything, that's why! Replace it immediatly with a regualr collar. When she lays down or tries to sit, say 'come on girl' in a calm tone. You have to be calm and happy, for her to be. When she stops and seems she doesn't want to, don't tug, but wait for her to come. When she does, give her a treat. Every time she stops, do the treat thing. Once she starts walking, throughout the walk tell her how good she is and use nice gentle words. Just remember, don't tug. It's probably making the problem worse. If it gets worse, go to a vet. Plus yeah, it could be joint problems.