My 8 yoa GSD has developed a problem when trying to poop. She struggles to go and when she does just a small piece will come out. Every time I take her out she tries to go. No other health problems, poop consistency appears normal. Vet says he believes it is some type of degenerative nerve or spine issue, but that sounded more like a guess than anything else as he ran no tests of any kind. Switched to a high fiber food, which seemed to help a little for a few months. This has been going on for about 9 months now. Anyone have any ideas on what could be causing it or what I can do to help her.