Somebody, anybody please help me

jessicaandbuddy

My dog Buddy whenever I throw a ball or when he has something in his mouth he shouldn't have, he runs away with the object in his mouth. How can I get this to stop. It's driving me crazy. It's the only behavioral problem he has. I taught him to sit inside of a day and we are working on other things now, but how do I get this running away nonsense to stop? I know why he does it, but how do I stop it?