Hello all, I had a few questions about mountain biking with a GSD. I should start off by saying that I do not have a GSD; however, I’ve wanted one for years. My family is into mountain biking and running and while the GSD would be a great companion for the latter, I’m not so sure about the former. Would mountain biking put to much stress on the hips and elbows? I understand that steep declines would require us to slow down quite a bit, but would two and three hour trail rides in the mountains be too much over the years? This is assuming that we build him or her up to that level stamina wise and weather (temp) permitting. I tried using search but could not find any info or posts specific to this topic. Thanks.