Hi
I have a 10 year old german shepherd and she too gets stiff at night if she has done too much through the day. I have found that giving her cod liver oil in her tea seems to help and I have limited her excercise as well. Don't get me wrong she still walks for nearly an hour a day but at her pace. If my sister comes up with her dog and we go out together then she is extremely stiff as she still thinks she can play. I would maybe try keeping her to one long walk even at the weekend or 2-3 shorter walks.
Hope this helps.
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