Cindy's Answer
This sounds like a working line dog channeling their drive into an obsessive activity. I purchased a working line GSD from Europe many years ago and he also did something similar. Not only did it destroy the yard and his feet, but his teeth were wearing down from carrying the rocks. If he's 5 years old and he's done this for an extended time the only way to do something about it is to take away the option.
If you can't supervise and stop the behavior, he'll have to be contained in an area where he can't do this. I set up a large kennel run on a concrete slab for my dog so he could not access rocks or dig.
I wish there was a way I knew to fix it but unless you are there to interrupt the behavior I would expect it to continue.
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