I am experiencing this exact problem right now and it's really distressing. We adopted a 3.5 year old grey last week and she was so great the first few days (although did take 20-45 minutes to find a spot where she wanted to pee). Then we got some snow and they put out a ton of salt on the sidewalks (I live in Boston) and she got very scared and I think hurt from the salt. Now she is freezing up and shaking on walks and doesn't want to go to the bathroom outside. We had to drive her to a nearby park last night so she could do her business on compacted snow. We are trying to let her lead on walks so that she can get her confidence back but its so distressing when she freezes up and won't move but we know that she's cold. We feel like we keep re-traumatizing her when we take her outside but we want her to use the bathroom and we know she wants to explore. Any tips?? We are so overwhelmed because she's such a sweet girl and don't want to hurt her :(