I own a small female york shire terrier who just turned 6 and for some reason she refuses to climb stairs anymore. I’d think that she would be scared of the stairs but she had no problem doing it before. It started out with her climbing stairs and then stopping in the middle of the staircase and not moving until i picked her up. after a couple months of that she just suddenly stopped. I’ve been walking her through the staircase now step by step for 3 weeks and nothings changed. Except now she might think that she needs me to climb stairs now :(. Any advice?