ok so we have a 4 month old Queensland heeler mix and he seems to eat everything in our yard. Rocks, grass, flowers etc. etc. etc. He recently has learned to go to the back door when he has to go out and go potty however he doesnt always go potty when outside. I think he likes to go out to run in the yard and eat stuff. I dont want to deny him going outside when standing at the door not knowing if he actually has to potty or not. Question is how do we keep him from eating everything on those trips that he doesnt potty?