I noticed that my cocker trembles when upset...just now on a walk she stopped and her body shook a bit, then she would not walk but then continued. Her favorite spot has always been the sofa. Now she goes over to it , looks at it and can't seem to jump up. She doesn't appear to be in any pain but I am worried because this is such a change. I love her so much. She will be 8 in June. She is a dear companion...my husband died recently so I am upset. Any advice?? Thanks in advance.