Work on training leave it! Just be careful, stones can cause blockages which can mean surgery, and broken teeth.
My 5 1/2 month old has the same problem, and can find rocks anywhere, even If he has to dig to unearth them! I'm very vigilant about it, and he's accustomed to me removing them. Doing a trade for a treat would be the better option if possible, they're less likely to run and just swallow it down!
Hope that helps, we still struggle with this one! Thor loves to put everything in his mouth!
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