We've had Max about a month now. He's a little over 3 mo old. He is eating Iams puppy food. I put some wet puppy food in with it because of puppy teeth loss. He does eat crap out side, dry weeds, rabbit poop etc. The problem is he has very loose stools. Not all the time. Yesterday was fine today it was fine this morning and now it very loose. I go to call the vet and before I do he's fine again. Any ideas?