
My sister's dog does this and for some reason unbeknown to me she has allowed this to continue. I now make sure i take them from him if i see him with a stone, he tends to use them like a ball, way too many people throw them for him and then he comes back and chews them. He now has no teeth left per say, more stumps.. So there it goes,
don't allow your dogs near stones!!!
The amount of times i have told people not to throw stones for him when he is here and they ignore me or for some reason go deaf on me when i tell them..