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I would be limiting the amount of stones he can pick as both stones and sand if swallowed can cause a blockage.
Can you give him a leave it command for the stones and redirect him to a bigger dog toy? That would be the best bet to keep his health from being compromised.
To help items pass, providing there is no blockage. you can add some pure canned pumpkin to his daily meal. a1/2 teaspoon to a whole teaspoon. Pumpkin acts like a fiber and helps to push things through. Again you don't want to do this if there is a blockage and a blockage would show sudden lack of appetite, vomiting, diarrhea and lethargy. If he is acting his normal playful self then it likely he is fine.